Climate Overview
The climate in Puerto Williams is cool. The average annual temperature is 5°C and approximately 966mm 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 171cm accumulating over the season.
Temperature
Puerto Williams sees moderate temperature variation throughout the year, ranging from -2°C to 12°C. February is the warmest month, though highs remain moderate at 12°C with a mean of 9°C. The coldest month is July, when overnight lows fall to -2°C and the daily average is 0°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between May and June, with a 3°C shift in average temperatures.
Precipitation
Puerto Williams is a moderately rainy area, receiving approximately 966mm of precipitation annually, which averages out to around 80mm 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 July, with just 51mm. That's 73mm less than January, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 171cm accumulating over the season. August typically sees the most snow at around 29cm.
Wind
Puerto Williams is moderately windy, with an average annual wind speed of 20km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 23km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in June, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 17km/h in winter, 22km/h in spring, 23km/h in summer, 19km/h in autumn.
Seasons
89 days until Winter
It is currently autumn in Puerto Williams, which began on March 20, 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 12°C, while the coldest stretch bottoms out in July near -2°C. Winter is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from -1 to 10°C. Precipitation is moderate at around 221mm for the season, averaging 74mm per month. Winds are moderate at around 22km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 5 to 12°C. Rainfall is heavy, totalling around 339mm across the season with a monthly average of 113mm. Winds are moderate at around 23km/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 242mm for the season, averaging 81mm per month. Expect around 33cm of snow accumulation during this period. Winds are moderate at around 19km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -2 to 4°C. Precipitation is moderate at around 164mm for the season, averaging 55mm per month. Expect around 77cm of snow accumulation during this period. Winds are moderate at around 17km/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.
