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Weather Guide: El Chaltén

Detailed weather data for El Chaltén: monthly temperatures, rainfall, wind, and a complete packing guide for every season.

Updated for 2025–2026 Season
8 min read
Climate: Subpolar Oceanic with Mountain InfluenceElevation: 400m
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Overview

Nestled in the heart of Los Glaciares National Park, El Chaltén experiences a Subpolar Oceanic climate heavily influenced by the Southern Patagonian Ice Field and Andean mountains. Summers are cool and windy, while winters are cold, snowy, and equally windy. Precipitation is common year-round, often as rain in warmer months and snow in colder ones, with unpredictable changes being the norm.

Monthly Weather

January

Peak
18°
7°
10 rainy days|0 snow days|8.5 hrs sun|55 km/h

January is peak summer, offering the warmest temperatures and longest daylight hours, ideal for extensive trekking. However, strong winds are a constant companion, often reaching gale force, and sudden weather shifts are common.

February

Peak
17°
6°
9 rainy days|0 snow days|8 hrs sun|50 km/h

Still very much summer, February continues to offer good hiking conditions with slightly less intense winds than January, though they remain strong. Expect cool mornings and evenings, and be prepared for rain.

March

High
14°
4°
11 rainy days|1 snow days|7 hrs sun|45 km/h

Autumn begins, bringing vibrant fall colors to the Lenga forests and cooler, crisper air. While still good for hiking, temperatures drop, and the chance of early season snow increases, particularly later in the month.

April

Moderate
9°
1°
12 rainy days|4 snow days|5.5 hrs sun|40 km/h

April is a beautiful shoulder month, with fewer crowds and stunning autumn foliage. However, temperatures are distinctly colder, snow becomes more likely, and some services may begin to close towards the end of the month.

May

Low
5°
-2°
10 rainy days|8 snow days|4 hrs sun|35 km/h

May marks the transition into winter. Expect significant temperature drops, frequent snowfall, and shorter daylight hours. Many trails become inaccessible, and some establishments close for the season.

June

Low
2°
-4°
9 rainy days|12 snow days|3 hrs sun|30 km/h

June is the beginning of winter, characterized by very cold temperatures, abundant snow, and the shortest days of the year. Trekking is extremely challenging and often requires specialized equipment and experience.

July

Low
1°
-5°
8 rainy days|15 snow days|3.5 hrs sun|30 km/h

Mid-winter in El Chaltén means consistent sub-zero temperatures, heavy snowfall, and icy conditions. While challenging, it offers a serene, snow-covered landscape for those prepared for true winter expeditions.

August

Low
3°
-4°
9 rainy days|13 snow days|4.5 hrs sun|35 km/h

August sees a slight increase in temperatures and daylight, hinting at the end of winter, but snow and cold remain dominant. It's still a winter destination, with most high trails inaccessible without specialized gear.

September

Low
7°
-1°
10 rainy days|7 snow days|6 hrs sun|40 km/h

Spring begins, with melting snow creating beautiful, gushing streams. Days get longer, but temperatures remain chilly, and snow can still fall, especially at higher elevations. Many services begin to reopen mid-month.

October

Moderate
11°
2°
11 rainy days|3 snow days|7 hrs sun|45 km/h

October is a beautiful time as nature awakens, and most main trails become accessible again, though some higher routes might still have snow and ice. Winds start to pick up, and weather remains unpredictable.

November

High
15°
5°
10 rainy days|1 snow days|8 hrs sun|50 km/h

November is the run-up to peak season, offering longer days and generally milder weather for trekking, though strong Patagonian winds are definitely present. Crowds begin to increase significantly.

December

Peak
17°
6°
10 rainy days|0 snow days|8.5 hrs sun|55 km/h

December kicks off the summer high season, bringing the longest daylight hours and relatively warmest temperatures, making it prime time for hiking. However, expect very strong winds and sudden, short-lived storms.

Best Time to Visit

The best time to visit El Chaltén for trekking is from November to April. Within this window, December to February offers the warmest weather and longest daylight, but also the highest winds and crowds. March and October provide a quieter experience with beautiful autumn colors or spring blooms respectively, though with cooler temperatures and increased chances of snow in higher elevations.

Worst Time to Visit

The worst time to visit El Chaltén for general trekking is during the winter months, from June to August. Temperatures are consistently below freezing, snowfall is heavy, many trails are inaccessible or dangerous due to ice and snow, and most services in town are closed. May and September are shoulder months that can also be challenging due to cold, increased precipitation (rain/snow), and limited services.

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Weather Warnings

Extreme Winds: El Chaltén is infamous for strong, sustained winds, often exceeding 60-80 km/h, with gusts over 100 km/h. These winds can make hiking difficult, increase the perceived cold, and require sturdy gear.

Rapid Weather Changes: The Patagonian weather is highly unpredictable. It's common to experience sun, rain, and snow all in a single day. Always be prepared for all conditions, regardless of the forecast.

Sudden Storms: Fast-moving storms can bring heavy rain or snow, strong winds, and whiteout conditions, especially at higher altitudes. Check forecasts regularly and be prepared to turn back.

Strong UV Radiation: Due to the clear air, high altitude (relative to sea level for some treks), and proximity to the Antarctic ozone hole, UV radiation can be very strong, even on cloudy days. Always use high-SPF sunscreen, sunglasses, and a hat.

Snow and Ice Hazards: During shoulder and winter months, snow and ice can cover trails, making them slippery and dangerous. Avalanche risk can also be present in certain areas. Micro-spikes or crampons might be necessary.

Layering Guide

Dressing in layers is paramount for El Chaltén due to its highly variable weather. Start with a moisture-wicking synthetic or merino wool base layer. Add a warm fleece or lightweight down jacket as a mid-layer for insulation. Your outer layer should be a completely waterproof and windproof shell jacket and pants to protect against the elements. For winter, a heavier expedition-style down parka and insulated snow pants are necessary. Always include a warm hat (beanie), gloves or mittens, and a neck gaiter. When hiking, you should be able to add or remove layers quickly to adapt to changing temperatures, wind, and precipitation.

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