Climate Insights for Williams Lake

The climate in Williams Lake is cool. The average annual temperature is 5°C and approximately 614mm of precipitation falls per year. Williams Lake receives a notable amount of rainfall throughout the year, including during its driest month. Williams Lake is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are February, January, December, when temperatures can drop to -11°C. Snowfall occurs from January to December, with around 165cm accumulating over the season.

Williams Lake has a wide annual temperature range, spanning 36°C from the coldest to warmest months. August is the warmest month, though highs remain moderate at 25°C with a mean of 16°C. The coldest month is February, when overnight lows fall to -11°C and the daily average is -7°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Williams Lake is a relatively dry area, receiving approximately 614mm of precipitation annually, which averages out to around 51mm per month. The wettest month is October, averaging 82mm of rainfall. July and September also tend to see above-average precipitation. The driest month is March, with just 32mm. That's 50mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 165cm accumulating over the season. February typically sees the most snow at around 35cm.

Williams Lake is relatively calm, with an average annual wind speed of 2km/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 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently summer in Williams Lake, which began on June 21, 2026. Williams Lake is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 25°C, while the coldest stretch bottoms out in February near -11°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Williams Lake is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 59mm per month. By contrast, February can be quite cold with temperatures dropping to -11°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Williams Lake 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.