Lake Atitlan weather and climate

The two seasons

Lake Atitlan has a subtropical highland climate (Köppen Cwb), sometimes called "eternal spring." The annual mean temperature at Panajachel is roughly 17 C (63 F). The warmest month, March, averages a daytime high of about 24.8 C (76.6 F). The coolest month, November, averages about 22.9 C (73.2 F). That two-degree spread across twelve months is the origin of the eternal-spring label.

Dry season: November through April. Six months of mostly clear skies, lower humidity, and reliable sun. Mornings are cool: 13-15 C (55-59 F) at lake level, with frost possible above 2,000 m in December and January. This is classic Atitlan: blue water, sharp volcanoes, clear horizons. It is also peak tourist season, particularly December through January (northern-winter escape), Semana Santa (March or April), and the Christmas holidays. Prices and crowds peak in this window.

Rainy season: May through October. About 85 percent of the year's total rainfall. The pattern is predictable: clear or partly cloudy mornings, cumulus clouds building through midday, afternoon or evening thunderstorms (typically 3 to 7 PM), and clearing overnight. It is not a six-month downpour. Mornings in June and July are often gorgeous and green. Prices drop, towns are quieter, and the hillsides turn vivid green. The late wet season (September through October) carries the highest risk from tropical systems: Hurricane Stan reshaped the lake area in October 2005.

When does it rain?

In the wet season, the daily rain pattern is highly consistent. Mornings are your working hours: lanchas, hikes, market visits, and kayaking all fit comfortably before noon. By early afternoon, clouds build over the volcanoes and the surrounding highlands. Rain typically arrives between 2 and 6 PM, often as heavy convective thunderstorms rather than drizzle. By evening the sky frequently clears again, and nights are often dry and starry.

The canícula, a regional dry break in mid-July to mid-August, briefly reduces rainfall to about 60 percent of June's peak. Sun hours improve noticeably. For travelers, this is a usable wet-season window with greener scenery and fewer crowds than peak dry season.

In dry season (November through April), rain is rare but not impossible. April is the transition month and can bring occasional afternoon showers. January and February are the most reliably dry months.

Temperature by month

Long-term means, Panajachel station. Source: INSIVUMEH / climate-data.org consensus.

The Xocomil wind

The Xocomil (pronounced show-co-MEAL) is a daily thermal-gradient wind that defines life on the lake. As the surrounding highlands and volcanic slopes heat through the morning, rising hot air draws cooler air over the lake's thermal mass into the caldera, where the walls concentrate and accelerate it. The Xocomil is strongest in dry season (November through March, peaking January and February) and gentler in wet season when cloud cover suppresses afternoon heating.

Typical onset is noon to 2 PM. Peak strength is 2 to 4 PM. It dies at sunset. The wind is strong enough to swamp a lancha. Lancheros stop open-water crossings once it is fully on. The practical rule for activities: swimming and paddleboarding before 10 AM, kayaking before 11 AM, lancha crossings in the morning. If you must cross in the afternoon, go only with an experienced captain who knows the conditions.

Microclimates by town

The lake is roughly 18 by 12 km, but conditions vary enough between towns that choosing where to stay is partly a weather decision.

• Panajachel (northeast, 1,562 m): The gateway town and the warmest spot on the north shore. The Xocomil arrives slightly later here. More sun exposure and less wind shelter than San Marcos. Good WiFi and services make it a practical base regardless of season.
• San Marcos La Laguna (northwest): Famously sheltered. The ridge geometry deflects the Xocomil, producing calmer afternoons than the rest of the lake. This is partly why it became the wellness and yoga hub.
• San Pedro La Laguna (south, base of Volcan San Pedro): Warmer and sunnier than most towns. The volcano provides afternoon shade from the west but also protects from some wind. Popular with budget travelers year-round.
• Santa Cruz La Laguna (north, ~1,997 m): Sits roughly 435 m above lake level. Noticeably cooler and often foggy in the morning. Cloud-forest edge vegetation. A sweater is non-optional even in dry season. Boat access only.
• Santiago Atitlan (south basin): The basin opens wide on the south shore, and Santiago gets full-force afternoon Xocomil. Very windy from early afternoon. The large, culturally rich town rewards a visit, but plan water activities for the morning.
• San Juan La Laguna (south): Similar character to San Pedro but slightly quieter. Mornings are clear and calm, afternoons windy in dry season.
• Tzununa and Jaibalito (north, above lake): Off-grid, higher elevation, cooler. Cloud forest is just above town. These are some of the quietest and most nature-immersed spots on the lake.

What to pack for the weather

• Layers, always. A light fleece or sweatshirt for evenings and mornings, regardless of season. Even in June, 6 AM on a lancha in the Xocomil is cold.
• Packable rain jacket. Essential in wet season, useful in dry season shoulder months. A poncho works for town; a proper shell is better for hikes and boat crossings.
• Sun protection. UV at 1,562 m is significantly stronger than at sea level. SPF 50, a brimmed hat, and sunglasses every day.
• Hiking shoes or trail runners if you plan any volcano or ridge hike. The trails are rocky and steep; sandals are not suitable.
• Quick-dry clothing. Wet season means clothes that do not dry in a day are a problem. Merino wool or synthetic fabrics outperform cotton.
• Warm layer for volcano hikes. Summit temperatures on San Pedro (3,020 m) and Toliman (3,158 m) drop to 5-10 C. Volcán Atitlan (3,537 m) is fully alpine: bring gloves and an insulating mid-layer.
• Water bottle or filter. Lake water is not potable. Carry water on all hikes; a filter or purification tablets are useful for longer trails.

Weather by activity

• Kayaking and paddleboarding: Before 10 AM year-round. January and February deliver the flattest morning water. In wet season, get on the water before 9 AM before afternoon convection starts building.
• Swimming: Lake surface temperature stays near 21 C (70 F) year-round. Water quality is generally better in dry season (November through April) when runoff is minimal. Avoid swimming after heavy rain. See the safety guide for swimming spots.
• Volcano hikes: Dry season (November through March) for clear summit views. Mid-July (canícula) is a usable wet-season option. Avoid September and October for summit trails.
• Lancha travel: Always morning. The Xocomil can make afternoon crossings hazardous. If you must travel after noon, go with an experienced captain who knows conditions that day.
• Photography: January and February for the sharpest volcano profiles and clearest air. The canícula (mid-July to mid-August) delivers lush green landscapes with improving light. Morning golden hour is roughly 6:00 to 7:30 AM year-round.

Climate change and the lake

The lake is warming. Surface water temperatures have risen approximately +0.34°C per decade since 2010 (García-Oliva et al. 2026). Combined with higher rainfall variability and sediment loading from upstream deforestation, the lake's water level has risen measurably in recent years, flooding lakefront structures and forcing relocations in San Pedro, San Marcos, and other towns. The late wet season (September through October) carries increasing risk from intense tropical systems: Hurricane Stan in October 2005 buried part of Panabaj village and caused hundreds of deaths across the region.

For travelers: this context does not change the broad seasonal advice, but it does mean that lakefront accommodations in flood-prone low areas carry more risk than they did ten years ago, and that September-October travel requires more weather monitoring than it once did.

The Xocomil: etymology and local knowledge

The name Xocomil comes from the Kaqchikel and Tz'utujil languages and is variously translated as "the wind that carries away sin" or interpreted through a legend of a princess carried off by the wind. Local lancheros know the Xocomil intimately: experienced captains can read the early signals (a darkening of the water on the western shore, a specific stillness before the wind arrives) and adjust routes accordingly. The Xocomil blows predominantly from east to west across the lake. The southern basin (Santiago Atitlán area) gets its full force because the basin opens wide. San Marcos on the northwest shore gets significantly less because of the ridge geometry. On days when the Xocomil does not develop, usually during wet-season overcast, the lake stays calm all afternoon.