Chilliwack (BC) Temperature by Month

Chilliwack, British Columbia, Canada has an average annual maximum temperature of 12°C (54°F), ranging from 3°C (37°F) in December to 22°C (72°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

In Chilliwack, temperatures can shift dramatically between warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 11°C (52°F) in August to -2°C (28°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Chilliwack by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. August, the city's warmest month, gets 249 hours of sunshine.

The chart below shows the average temperature throughout the year:

Chilliwack's average annual maximum temperature is 12°C (54°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Chilliwack this rarely lasts long on the ground.

For more on Chilliwack's weather, including monthly rainfall, sunshine hours, and humidity, visit our Chilliwack climate page.