Climate Insights for Chilliwack

The climate in Chilliwack is cool. The average annual temperature is 8°C and approximately 2452mm of precipitation falls per year. Chilliwack receives a notable amount of rainfall throughout the year, including during its driest month. Chilliwack is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, December, January, when temperatures can drop to -3°C. Chilliwack experiences heavy snowfall, typically from January through December.

Temperatures in Chilliwack vary considerably across the year, with a 26°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 23°C with a mean of 17°C. The coldest month is February, when overnight lows fall to -3°C and the daily average is 0°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Chilliwack is a very wet location, receiving approximately 2452mm of precipitation annually, which averages out to around 204mm per month. The wettest month is November, averaging 386mm of rainfall. December and January also tend to see above-average precipitation. The driest month is July, with just 48mm. That's 338mm less than November, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Chilliwack receives heavy snowfall, accumulating around 605cm annually from January through December. The snowiest month is December, with approximately 155cm. Winter travel should account for significant snow cover.

Chilliwack is relatively calm, with an average annual wind speed of 1km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 1km/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 summer in Chilliwack, which began on June 21, 2026. Chilliwack 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 23°C, while the coldest stretch bottoms out in February near -3°C. Autumn is next, beginning on September 23, 2026 (14 days from now).

The best time to visit Chilliwack is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 49mm per month. By contrast, February can be quite cold with temperatures dropping to -3°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 Chilliwack 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.