Climate Overview
The climate in Puerto Williams is cool. The average annual temperature is 5°C and approximately 928mm of precipitation falls per year. Puerto Williams receives a notable amount of rainfall throughout the year, including during its driest month. Puerto Williams is in the Southern Hemisphere. The seasons are reversed: summer runs from December to February, while winter falls between June and August. The summer months are: February, January, December. The coldest months are July, June, August, when temperatures can drop to -2°C. Snowfall occurs from January to December, with around 184cm accumulating over the season.
Temperature
Puerto Williams sees moderate temperature variation throughout the year, ranging from -2°C to 13°C. February is the warmest month, though highs remain moderate at 13°C with a mean of 9°C. The coldest month is July, when overnight lows fall to -2°C and the daily average is 1°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between March and April, with a 2°C shift in average temperatures.
Precipitation
Puerto Williams is a moderately rainy area, receiving approximately 928mm of precipitation annually, which averages out to around 77mm per month. The wettest month is January, averaging 124mm of rainfall. December and February also tend to see above-average precipitation. The driest month is June, with just 44mm. That's 80mm less than January, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 184cm accumulating over the season. August typically sees the most snow at around 32cm.
Wind
Puerto Williams is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 11km/h in winter, 14km/h in spring, 14km/h in summer, 12km/h in autumn.
Seasons
87 days until Summer
It is currently spring in Puerto Williams, which began on September 23, 2026. Puerto Williams is in the Southern Hemisphere, where the seasons are reversed: spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 13°C, while the coldest stretch bottoms out in July near -2°C. Summer is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 0 to 11°C. Precipitation is moderate at around 216mm for the season, averaging 72mm per month. Winds are generally light, averaging 14km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 5 to 13°C. Rainfall is heavy, totalling around 344mm across the season with a monthly average of 115mm. Winds are generally light, averaging 14km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 1 to 11°C. Precipitation is moderate at around 225mm for the season, averaging 75mm per month. Expect around 39cm of snow accumulation during this period. Winds are generally light, averaging 12km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -2 to 5°C. Rainfall is relatively light, with around 143mm over the season and a monthly average of 48mm. Expect around 82cm of snow accumulation during this period. Winds are generally light, averaging 11km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Monthly Climate Data
The table below shows monthly climate averages for Puerto Williams based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
