Climate Insights for Puerto Williams

The climate in Puerto Williams is cool. The average annual temperature is 5°C and approximately 1026mm 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, August, June, when temperatures can drop to -2°C. Puerto Williams experiences heavy snowfall, typically from January through December.

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 6°C between highs and lows. The sharpest temperature change occurs between March and April, with a 3°C shift in average temperatures.

Puerto Williams is a moderately rainy area, receiving approximately 1026mm of precipitation annually, which averages out to around 85mm per month. The wettest month is January, averaging 142mm of rainfall. December and February also tend to see above-average precipitation. The driest month is July, with just 46mm. That's 96mm 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. Puerto Williams receives heavy snowfall, accumulating around 216cm annually from January through December. The snowiest month is August, with approximately 43cm. Winter travel should account for significant snow cover.

Puerto Williams is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently winter in Puerto Williams, which began on June 21, 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. Spring is next, beginning on September 23, 2026 — 84 days from now.

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.