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Weather Guide: Chaitén

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

Updated for 2025–2026 Season
7 min read
Climate: OceanicElevation: 10m
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Overview

This coastal Patagonian town experiences a cool oceanic climate (Cfb), characterized by mild temperatures, abundant precipitation throughout the year, and persistently strong winds. Summers are cool and breezy, while winters are mild but very wet, with occasional snow at higher elevations. Prepare for highly variable weather, where all four seasons can be experienced in a single day.

Monthly Weather

January

Peak
18°
9°
12 rainy days|0 snow days|7.5 hrs sun|40 km/h

The heart of summer brings the warmest temperatures, though still mild. Expect long daylight hours, but also be prepared for frequent rain showers and notoriously strong Patagonian winds. This is a popular time for hiking and exploring.

February

Peak
18°
9°
11 rainy days|0 snow days|7 hrs sun|42 km/h

Similar to January, February maintains relatively mild temperatures and long daylight. Winds remain a constant factor, and while sunny periods are common, rain can appear quickly. It's still prime time for outdoor adventures before autumn sets in.

March

High
16°
7°
14 rainy days|0 snow days|6 hrs sun|38 km/h

As summer transitions to autumn, temperatures begin to cool, and rainfall typically increases. The vibrant autumn colors start to emerge, offering stunning scenic views amidst the more unpredictable weather. Winds remain significant.

April

Moderate
13°
5°
18 rainy days|0 snow days|4.5 hrs sun|35 km/h

Autumn is in full swing, bringing cooler temperatures and a noticeable increase in precipitation. The days shorten, and the landscape deepens into rich fall hues. Prepare for more persistent rain and stronger, biting winds.

May

Low
10°
3°
20 rainy days|1 snow days|3 hrs sun|30 km/h

May marks the onset of colder, wetter conditions, with a higher chance of frosts and occasional low-level snow. Daylight hours are significantly shorter, and much of the region quietens down. Conditions can be challenging for outdoor activities.

June

Low
8°
2°
22 rainy days|2 snow days|2.5 hrs sun|28 km/h

Winter officially begins, bringing the coldest temperatures of the year and the highest frequency of rain and snow. Days are short, and the weather can be quite severe, limiting accessibility to some areas. Expect chilly, damp conditions.

July

Low
7°
1°
23 rainy days|3 snow days|2 hrs sun|25 km/h

The peak of winter sees consistent cold temperatures and the most snowfall, though Chaitén's coastal location means heavy snow is less common than inland. Frequent rain and strong winds are the norm. This is the quietest time of year.

August

Low
8°
1°
21 rainy days|2 snow days|3 hrs sun|27 km/h

Winter gradually begins to recede, with a slight uptick in temperatures and sunshine, though conditions remain cold and wet. Snow and rain are still very common. It's a transitional month, with early signs of spring appearing towards the end.

September

Low
11°
3°
18 rainy days|1 snow days|4 hrs sun|30 km/h

Spring arrives, bringing longer daylight hours and a gradual increase in temperatures. While still cool and often wet, the intensity of winter subsides. Melting snow can lead to higher river levels, and fresh green shoots appear.

October

Moderate
13°
5°
16 rainy days|0 snow days|5.5 hrs sun|33 km/h

Spring blossoms more fully, with temperatures continuing to rise and a decrease in snowy days. The landscape becomes vibrant with new growth, and while rain is still common, there are more clear, sunny periods. Winds remain noticeable.

November

High
15°
7°
13 rainy days|0 snow days|6.5 hrs sun|37 km/h

This month is a fantastic shoulder season, offering pleasant, milder temperatures and increasing daylight as summer approaches. Rain showers are still frequent, but the weather is generally more settled than in spring. Crowds start to build.

December

Peak
17°
8°
12 rainy days|0 snow days|7 hrs sun|39 km/h

Early summer brings warmer, more stable weather, though Chaitén's famous winds are still present. Daylight hours are at their longest, making it an ideal time for exploring. Expect a mix of sun, clouds, and occasional rain.

Best Time to Visit

The shoulder seasons of November and March offer a wonderful balance of pleasant weather, fewer crowds than peak summer, and stunning seasonal changes. December, January, and February are also excellent for the warmest temperatures and longest daylight, though winds are strongest and crowds highest. October is also a good spring month.

Worst Time to Visit

June, July, and August constitute the depths of winter, characterized by cold temperatures, heavy rainfall, frequent snow, very short daylight hours, and limited access to some areas. May and September can also be challenging with increased precipitation and cooler temperatures.

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Weather Warnings

Extreme Winds: Patagonia is infamous for its strong, unpredictable winds, which can reach gale force speeds (60-100+ km/h) even on seemingly calm days. Always be prepared for sudden gusts that can make hiking difficult and cause objects to fly.

Rapid Weather Changes: The weather can shift dramatically within hours, moving from sunshine to driving rain or even snow. Always carry layers and waterproof gear, regardless of the forecast.

Heavy Rainfall: Chaitén experiences high annual rainfall, particularly in autumn and winter. Be prepared for consistently wet conditions and potential localized flooding.

Low UV Index in Winter: While summer requires strong UV protection, winter in Chaitén, due to heavy cloud cover and southern latitude, means UV index is very low. However, when sun does break through, reflection off snow/water can increase exposure.

Layering Guide

The key to staying comfortable in Chaitén's variable climate is a multi-layered approach. Start with a moisture-wicking base layer (merino wool or synthetic) to manage sweat. Add an insulating mid-layer (fleece or down vest) for warmth. Your outer layer should be a waterproof and windproof shell jacket and pants to protect against rain and the relentless Patagonian winds. Always include a warm hat, gloves, and a scarf, as much heat is lost from extremities. This system allows you to adapt quickly to changing conditions.

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