Guatemala Under the Stars: Volcanoes, Highland Lakes & Petén Night Skies
Stargazing in Guatemala changes sharply with altitude and region: volcanic summits rise above the central highlands, Lake Atitlán sits inside a steep volcanic basin, the Cuchumatanes form a remote western plateau, and Petén trades darker rural surroundings for tropical humidity and forested horizons. January–February provides the strongest shared planning window across this eight-location portfolio, with a drier seasonal pattern across much of the western highlands and Pacific lowlands while northern Petén remains more moisture-prone. The locations span high mountain camps, remote lakes, Maya Biosphere Reserve communities, accessible lakeshores and the Pacific coast.
Guatemala Night-Sky Planning Map
Eight observing environments are ranked in the same order used by the location cards and comparison table.
The markers identify geographic planning centers rather than approved parking spaces or guaranteed observing pull-offs. Guatemala’s volcano trails, municipal parks, Maya Biosphere Reserve gates, lakefronts and protected coastal areas follow different access rules, so the relevant administrator, road status and legal nighttime stopping point should be checked before travel.
Guatemala Stargazing Suitability Score
Guatemala’s score reflects a portfolio that ranges from nearly 4,000-meter volcanic terrain to humid Petén forest and a sea-level Pacific horizon. Each location is assessed with the same seven factors and weights, then each country factor is taken from the median of the eight location values. The result is an editorial planning index rather than an official sky classification or live forecast, and it does not certify legal access or clear weather.
Artificial-Light Escape
30%78Method: Disclosed Editorial Rubric. No Bortle class, SQM reading or extracted VIIRS radiance is assigned to these points.
Raw: Rural remoteness, protected-area geography, settlement density around each planning center and likely regional light-dome exposure are placed on the fixed categorical light-escape scale.
Location Values: Acatenango 85 · Todos Santos Cuchumatán 85 · Laguna Brava 95 · Volcán San Pedro 70 · Uaxactún 95 · El Remate 70 · San Juan La Laguna 55 · Monterrico 55.
Source Mapping: CONAP protected-area and route descriptions establish the remote or settled geographic context. NASA Black Marble is retained as the nighttime-light data family for future direct radiance extraction, but its numeric radiance values are not claimed here.
Median: Sorted values 55, 55, 70, 70, 85, 85, 95, 95; median = (70 + 85) / 2 = 77.5.
Period: Geographic and protected-area context; no single-night brightness measurement is substituted for a long-term light environment.
Sources: NASA Earthdata — Black Marble · CONAP — Altiplano protected areas · CONAP — Tikal and Uaxactún
Clear-Sky Reliability
20%85Method: Official Categorical Evidence using long-term regional climatology rather than invented point cloud percentages.
Raw: January–February falls within Guatemala’s drier part of the seasonal cycle. The western highlands and Pacific locations receive the higher dry-window category; Petén and Laguna Brava retain lower scores because northern and mountain-forest moisture remains more persistent.
Location Values: Acatenango 85 · Todos Santos Cuchumatán 85 · Laguna Brava 70 · Volcán San Pedro 85 · Uaxactún 70 · El Remate 70 · San Juan La Laguna 85 · Monterrico 85.
Source Mapping: INSIVUMEH separates Guatemala into climate regions including Occidente, Norte and Pacífico and publishes 1991–2020 climatological indices. Station data are regional representatives rather than exact cloud measurements at mountain summits or lakeshores.
Median: Sorted values 70, 70, 70, 85, 85, 85, 85, 85; median = 85.
Period: Long-term climate context centered on the 1991–2020 climatology; Preferred Observing Window January–February.
Sources: INSIVUMEH — Climate Indices in Guatemala · INSIVUMEH — Conventional Meteorological Station Network
Atmospheric Transparency Potential
15%70Method: Disclosed Editorial Rubric based on elevation, long-term humidity context and documented forest or maritime environments. No exact total-column water-vapour extraction is claimed.
Raw: The highest volcanic and Cuchumatanes locations receive the dry-elevated category. Lake Atitlán and Laguna Brava retain moderate scores; Petén forest and the Pacific coast receive the humid-environment category.
Location Values: Acatenango 85 · Todos Santos Cuchumatán 85 · Laguna Brava 70 · Volcán San Pedro 70 · Uaxactún 55 · El Remate 55 · San Juan La Laguna 70 · Monterrico 55.
Source Mapping: CONAP identifies cloud forest on Acatenango and San Pedro, mountain forest near Laguna Brava, humid tropical forest around Tikal and Uaxactún, and mangrove/coastal environments at Monterrico. INSIVUMEH supplies the national humidity and climate-station context.
Median: Sorted values 55, 55, 55, 70, 70, 70, 85, 85; median = 70.
Period: Long-term climatic setting applied to January–February; short-lived smoke, ash or weather episodes are not converted into fixed numeric penalties.
Sources: INSIVUMEH station network · CONAP — Petén forest context · CONAP — Monterrico
Astronomical Darkness Duration
10%100Method: Solar geometry at each marker latitude. Astronomical darkness is the interval with solar altitude below −18°.
Raw: 1 January–28 February · 59-night fixed non-leap seasonal window · 59/59 nights calculated at every marker.
Location Values: Acatenango 10.03 h/night → 100 · Todos Santos Cuchumatán 10.06 → 100 · Laguna Brava 10.08 → 100 · Volcán San Pedro 10.03 → 100 · Uaxactún 10.12 → 100 · El Remate 10.11 → 100 · San Juan La Laguna 10.04 → 100 · Monterrico 10.01 → 100.
Source Mapping: Latitude is taken from the map coordinates used throughout the page. Every night in the complete seasonal window contributes to each average.
Median: All eight normalized values are 100; median = 100.
Period: 1 January–28 February · 59/59 nights calculated.
Sources: Solar-position calculation using the same astronomical-darkness definition applied by the site’s methodology and live-darkness module.
Elevation and Horizon Quality
10%78Method: Fixed terrain rubric combining verified or mapped elevation with usable horizon geometry.
Raw: Acatenango 3,976 m with exposed summit terrain; Todos Santos marker near the upper Cuchumatanes around 3,587 m; Laguna Brava about 1,150 m with enclosing ridges; San Pedro 3,020 m; Uaxactún low tropical forest; El Remate low lakeshore; San Juan La Laguna about 1,600 m inside the Atitlán caldera; Monterrico about 10 m with an open Pacific sector.
Location Values: Acatenango 85 · Todos Santos Cuchumatán 85 · Laguna Brava 70 · Volcán San Pedro 85 · Uaxactún 50 · El Remate 70 · San Juan La Laguna 50 · Monterrico 85.
Source Mapping: Smithsonian Global Volcanism Program verifies Acatenango and San Pedro summit elevations. CONAP documents the high Cuchumatanes landscape, Atitlán volcano geometry and Monterrico coastline; mapped settlement and lake coordinates provide the remaining planning centers.
Median: Sorted values 50, 50, 70, 70, 85, 85, 85, 85; median = (70 + 85) / 2 = 77.5.
Period: Stable terrain and elevation characteristics.
Sources: Smithsonian GVP — Acatenango · Smithsonian GVP — San Pedro · CONAP — Todos Santos Cuchumatán
Night Access and Legal Clarity
10%60Method: Official Categorical Evidence based on published park hours, authorization systems, road access and administrative responsibility.
Raw: Acatenango allows access and authorized camping but requires route planning; San Pedro explicitly permits out-of-hours entry with prior authorization. Todos Santos municipal park publishes daytime hours, Uaxactún is reached through the Tikal gate system, and protected facilities around Monterrico publish daytime visitor hours. Lake and community points still require a legal local stopping place.
Location Values: Acatenango 70 · Todos Santos Cuchumatán 50 · Laguna Brava 50 · Volcán San Pedro 70 · Uaxactún 50 · El Remate 70 · San Juan La Laguna 70 · Monterrico 50.
Source Mapping: CONAP is the principal access source. Its Acatenango page states open access and authorized camping; the San Pedro page states that entry outside normal hours is possible with prior authorization; Todos Santos and the Tikal/Uaxactún complex publish defined visitor hours.
Median: Sorted values 50, 50, 50, 50, 70, 70, 70, 70; median = 60.
Period: Normal published access regimes. Temporary closures, road incidents and weather disruptions must be checked separately.
Sources: CONAP — Acatenango · CONAP — Volcán San Pedro · CONAP — Tikal and Uaxactún
Dark-Sky Protection and Astronomy Support
5%25Method: Fixed support rubric. Higher tiers require verified site-specific dark-sky designation, public astronomy infrastructure or local lighting protection.
Raw: DarkSky International documents astronomy and dark-sky advocacy in Guatemala, including astrotourism work connected with Maya heritage. Those national initiatives do not automatically create a designation or astronomy-facility bonus at any of the eight scored markers.
Location Scores: Acatenango 25 · Todos Santos Cuchumatán 25 · Laguna Brava 25 · Volcán San Pedro 25 · Uaxactún 25 · El Remate 25 · San Juan La Laguna 25 · Monterrico 25.
Source Mapping: Site-specific support is kept separate from general protected-area status and from archaeological astronomy heritage.
Median: All eight values are 25; median = 25.
Period: Verified institutional and conservation context documented by the linked organizations.
Sources: DarkSky International — Guatemala astrotourism · DarkSky International — Estrellas Ancestrales
Weighted Total: 77.5×0.30 + 85×0.20 + 70×0.15 + 100×0.10 + 77.5×0.10 + 60×0.10 + 25×0.05 = 75.8 → 76/100
The country score is the weighted total of the seven location-median factor values, not the average of the eight location overall scores.
Guatemala Stargazing Locations
Scores use one common January–February window. Cards remain ordered by Location Stargazing Score.
Acatenango Volcano
Chimaltenango volcanic highlands · 3,976 m summit
- CONAP places Acatenango at 3,976 m between Chimaltenango and Sacatepéquez, directly beside Volcán de Fuego.
- Camping is restricted to authorized places; CONAP also recommends using a local guide.
- The exposed upper mountain has broad volcanic horizons, but the strongest regional urban influence lies toward Antigua and the metropolitan corridor rather than the western highlands.
- Cold and strong summit winds are part of the normal high-elevation planning problem.
Main trade-off: The portfolio’s strongest elevation and rural-sky combination comes with a demanding ascent, high wind exposure and the need to follow authorized camping arrangements. Current volcanic and route conditions should be checked before departure.
Todos Santos Cuchumatán High Plateau
Sierra de los Cuchumatanes · marker near the upper Chemal plateau
The high Cuchumatanes offer Guatemala’s strongest non-volcanic altitude option in this portfolio. CONAP describes subalpine grassland, rocky terrain and mountain formations around 3,850 m within the Todos Santos protected landscape; the planning marker is placed near the high Chemal plateau rather than in the lower municipal center.
- The approach from Huehuetenango continues toward Chiantla and Chiabal before reaching dirt-road sections.
- CONAP advises contacting the Chiabal tourism committee and protected-area administration before visiting.
- The published municipal-park visitor schedule is 08:00–17:00, so the marker does not imply permission to remain inside a closed park sector after dark.
- Rainy-season four-wheel-drive advice reinforces why the January–February window is operationally useful.
Main trade-off: Sky and terrain potential are high; legal nighttime positioning is less straightforward than on Acatenango. Arrange access or select a legal public point outside restricted visitor areas rather than treating the marker as a parking instruction.
Laguna Brava (Yolnabaj)
Huehuetenango border highlands · approximately 1,150 m
Laguna Brava provides the portfolio’s strongest low-light lake setting. Its distance from Guatemala’s large urban centers produces a very different planning problem from Atitlán: access, humidity and enclosing mountain terrain matter more than city glow.
- The lake is also known as Yolnabaj and lies in remote northwestern Huehuetenango near the Mexican border.
- CONAP’s Häk Yahx Luúm reserve page identifies Laguna Yolnabaj or Laguna Brava as a nearby destination reached through the Nentón and Yalambojoch corridor.
- The surrounding mountain slopes limit a true all-sky horizon even when the water provides useful open sectors.
- No direct SQM or VIIRS radiance value is assigned; the 95 light score is the disclosed remote-rural category.
Main trade-off: Remoteness helps artificial-light escape but makes nighttime logistics less certain. Local access, land permission, return transport and an approved overnight location should be resolved before carrying astronomy equipment to the lake.
Volcán San Pedro
Lake Atitlán volcanic rim · 3,020 m
- CONAP gives a summit elevation of 3,020 m and an ascent time of roughly four hours.
- The upper volcano opens views over Lake Atitlán and the Atitlán–Tolimán volcanic group.
- Regular visitor entry is listed as 06:00–13:00, but CONAP explicitly states that entry outside those hours is possible with prior authorization from the administration.
- Cloud-forest vegetation and lake-basin moisture keep its transparency score below Acatenango despite the summit elevation.
Main trade-off: San Pedro has excellent elevated horizons, yet astronomy after dark is an authorization-led plan rather than an assumption that a daytime trail remains open.
Uaxactún Community
Maya Biosphere Reserve · northern Petén lowlands
Uaxactún shifts the ranking away from Guatemala’s high elevations. Its strength is remote Petén geography; its limitations are humidity, low elevation, dense forest and a road system tied to the Tikal access corridor.
- CONAP describes Uaxactún as a community within the Maya Biosphere Reserve north of Tikal.
- The route continues 23 km on dirt road beyond the Tikal parking and gate area.
- The published Tikal/Uaxactún visitor schedule is 06:00–18:00, so the archaeological park hours should not be interpreted as automatic independent night access.
- Forest canopy makes horizon selection more important than it is on the volcanic summits.
Main trade-off: Very low settlement-light pressure can be offset by forest obstruction and humid tropical air. Overnight observing should be coordinated with the community or responsible authority rather than planned around an assumed post-gate drive.
El Remate, Lake Petén Itzá
Eastern Petén lakeshore · approximately 130 m
- El Remate lies on the established Flores–Tikal approach described by CONAP, making it much easier to reach than Uaxactún.
- The Lake Petén Itzá shoreline gives useful open-water horizon sectors without requiring a summit ascent.
- Settlement lighting lowers the artificial-light score compared with remote Uaxactún.
- Warm, humid Petén air remains the main optical constraint in the preferred window.
Main trade-off: El Remate exchanges some darkness for easier logistics. Choose a legal lakefront position with a clear view away from nearby lamps rather than assuming every dock, hotel shoreline or roadside space permits overnight telescope use.
San Juan La Laguna, Lake Atitlán
Southwestern Lake Atitlán shore · approximately 1,600 m
San Juan La Laguna is the practical Atitlán option rather than the portfolio’s darkest one. The reserve itself has open access, while the settled shoreline provides accommodation and road or boat connections that remote highland sites cannot match.
- CONAP identifies San Juan among the established communities around the Lake Atitlán Multiple Use Reserve.
- The lake sits at roughly 1,560 m and is enclosed by steep terrain and three major volcanic cones on its southern side.
- Village lighting and neighboring settlements reduce faint-object contrast compared with the Cuchumatanes or remote Petén.
- The volcanic bowl blocks portions of the low sky even where the water opens a useful local horizon.
Main trade-off: The easier logistics suit casual observing and foreground photography, while deep-sky work benefits from moving away from direct village lighting and selecting an authorized waterfront position with the target direction in mind.
Monterrico Pacific Beach
Santa Rosa Pacific coast · approximately 10 m
- Monterrico provides the only sea-level observing environment in the portfolio and a broad Pacific horizon.
- CONAP describes a black-sand coast, mangroves and the Canal de Chiquimulilla within the protected area.
- The protected visitor area publishes 07:00–17:00 hours, so those facilities are not treated as an unrestricted nighttime astronomy site.
- Maritime humidity and settlement lighting keep the overall score below the mountain and remote-lake locations.
Main trade-off: The ocean horizon is excellent for low southern or western targets, but a legal public beachfront position must be distinguished from closed protected-area facilities, private property and sensitive wildlife areas.
Guatemala’s Dry-Season Geography: Highlands, Petén and Pacific
Western Highlands
INSIVUMEH treats Occidente as a distinct climatic region and uses stations including Huehuetenango and Labor Ovalle in its long-term climatology. January–February is operationally valuable here because the wet-season access problems described for the Cuchumatanes are reduced, while cold, wind and localized mountain cloud remain real constraints at altitude.
Petén Lowlands
The Norte climate region is represented by Flores in INSIVUMEH’s long-term analysis. Petén remains warmer and more moisture-prone than the western highlands, so Uaxactún and El Remate receive lower transparency scores despite their strong astronomical-darkness duration and, in Uaxactún’s case, very low settlement-light pressure.
Pacific Lowlands
Monterrico benefits from the Pacific dry-season pattern and an unobstructed ocean sector. Its low elevation brings the opposite atmospheric trade-off from Acatenango: no summit wind or ascent, but much more water vapour near the surface and less separation from coastal settlement lighting.
Atitlán: Water Horizons Inside a Volcanic Bowl
Lake Atitlán does not behave like a flat, open-country observing site. CONAP identifies Volcán San Pedro, Tolimán and Atitlán around the southern side of the lake, while settlements occupy much of the shoreline. A target rising behind a nearby ridge can remain hidden long after the same object is visible from an exposed summit, so target azimuth matters as much as nominal sky darkness.
Volcán San Pedro: Horizon First
The 3,020 m summit raises the observer above much of the caldera wall and produces a much stronger horizon score. The cost is a four-hour ascent and an authorization requirement for entry outside the published daytime schedule.
San Juan La Laguna: Logistics First
San Juan keeps the observer near accommodation, roads and lake transport. Direct local lighting is harder to escape and the caldera rim removes more of the low sky, but equipment transport is far simpler than carrying a telescope to a 3,020 m summit.
Acatenango and San Pedro Require Different Night-Access Plans
Guatemala’s two scored volcanoes cannot be treated as interchangeable summit trips. Acatenango’s official CONAP information lists open access and specifically permits camping only in authorized places, creating a recognized overnight-use pattern even though a local guide, cold-weather equipment and route checks remain part of the plan. San Pedro publishes a regular 06:00–13:00 entry period and separately states that access outside those hours can be granted with prior authorization.
Pacaya is not used as one of the eight scored observing locations. CONAP publishes 07:00–18:00 visitor hours for Pacaya National Park, and its active volcanic setting adds a different operational constraint. Its prominence as a volcano does not by itself establish a reliable astronomical-night access regime.
Petén: Dark Forest Skies Behind the Tikal Gate System
Petén’s remote forest can provide a strong escape from city lighting, but the best-looking dark area on a map is not automatically the easiest astronomical site. CONAP routes Uaxactún through the Tikal entrance system and then along 23 km of dirt road, while the combined Tikal/Uaxactún information publishes 06:00–18:00 visitor hours. That structure is why Uaxactún scores 95 for light escape but only 50 for night-access clarity.
El Remate solves a different problem. It lies on the established approach from Flores toward Tikal and keeps the observer on the Lake Petén Itzá corridor, reducing road complexity and equipment transport. The cost is a brighter settled environment. Tikal itself is not substituted for Uaxactún in the scored portfolio because archaeological importance and dark surroundings do not erase the published gate schedule.
Primary Location Comparison
The table uses all eight map locations in score order.
| Location | Score | Light Escape | Clear Sky | Primary Use | Horizon | Night Access | Main Constraint |
|---|---|---|---|---|---|---|---|
| Acatenango Volcano | 82 | 85 | 85 | High-altitude photography | 85 | 70 | Wind, cold, ascent and authorized camping |
| Todos Santos Cuchumatán High Plateau | 80 | 85 | 85 | Remote mountain observing | 85 | 50 | Nighttime legal positioning must be arranged |
| Laguna Brava (Yolnabaj) | 76 | 95 | 70 | Remote lake photography | 70 | 50 | Remote logistics, humidity and enclosing ridges |
| Volcán San Pedro | 75 | 70 | 85 | Elevated Atitlán horizon | 85 | 70 | Prior authorization for out-of-hours entry |
| Uaxactún Community | 72 | 95 | 70 | Remote Petén sky | 50 | 50 | Forest horizon, humidity and Tikal gate route |
| El Remate, Lake Petén Itzá | 69 | 70 | 70 | Accessible Petén lakeshore | 70 | 70 | Settlement light and humid lowland air |
| San Juan La Laguna, Lake Atitlán | 67 | 55 | 85 | Accessible lake photography | 50 | 70 | Village lights and volcanic-basin obstruction |
| Monterrico Pacific Beach | 67 | 55 | 85 | Low-horizon coastal targets | 85 | 50 | Maritime humidity and protected-area hours |
Tonight’s Astronomical Darkness
Calculated live from each location’s coordinates using NOAA’s public solar-position formula. Weather, cloud cover and local obstructions are not included.
Calculating…
Score Verification and Limitations
Scoring Scope
Preferred Observing Window: January–February
Locations Assessed: 8
Method Version: 2.2
Comparability Quality: C
Principal Data Periods
Clear-sky and atmospheric context uses long-term INSIVUMEH climatology, including the 1991–2020 reference period where available. Astronomical darkness uses the complete 59-night January–February fixed seasonal reference calendar. Stable protected-area, elevation and route information comes from CONAP and Smithsonian sources.
Main Limitations
No exact SQM, Bortle class, point VIIRS radiance, cloud-cover percentage or total-column water-vapour value is invented for the eight markers. Several factors therefore use disclosed categorical evidence. Mountain microclimates, forest openings, private land boundaries and legal nighttime stopping places can differ over short distances.