Chilliwack climate
Chilliwack (British Columbia, Canada) has a temperate oceanic climate (Köppen Cfb). The average temperature over the year is 11 °C51 °F, and about 1,815 mm71 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Chilliwack climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 643 | 033 | 338 | 25710 |
| Feb | 744 | 032 | 338 | 1536.0 |
| Mar | 948 | 236 | 642 | 2068.1 |
| Apr | 1356 | 541 | 948 | 1285.0 |
| May | 1966 | 949 | 1458 | 973.8 |
| Jun | 2171 | 1254 | 1762 | 813.2 |
| Jul | 2578 | 1559 | 2068 | 421.6 |
| Aug | 2578 | 1560 | 2069 | 481.9 |
| Sep | 2271 | 1254 | 1762 | 973.8 |
| Oct | 1560 | 745 | 1152 | 1977.8 |
| Nov | 948 | 338 | 643 | 27911 |
| Dec | 541 | 031 | 236 | 2309.1 |
| Year | 2578 | 031 | 1151 | 1,81571 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 94% | 76% | 1.1 | 8:38 |
| Feb | 92% | 72% | 2.0 | 10:04 |
| Mar | 91% | 77% | 3.2 | 11:44 |
| Apr | 84% | 75% | 4.6 | 13:39 |
| May | 80% | 72% | 5.4 | 15:17 |
| Jun | 80% | 71% | 5.6 | 16:12 |
| Jul | 77% | 47% | 6.5 | 15:49 |
| Aug | 77% | 48% | 5.5 | 14:23 |
| Sep | 79% | 58% | 3.8 | 12:31 |
| Oct | 85% | 71% | 2.2 | 10:40 |
| Nov | 93% | 78% | 1.1 | 9:02 |
| Dec | 95% | 78% | 0.8 | 8:13 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Chilliwack is like
The warmest month is August, with an average high of 25 °C78 °F and a low of 15 °C60 °F. The coldest is December, when highs average 5 °C41 °F and lows 0 °C31 °F. There is a clear seasonal cycle, with 17.9 °C32.2 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,815 mm71 in of precipitation per year. The wettest three-month stretch is November–January, which brings 42% of the annual total. The wettest month is November (279 mm11 in), the driest is July (42 mm1.6 in).
Relative humidity ranges from 77% in August to 95% in December. The clearest skies (lowest average cloud amount, 47%) are typical of July. Average wind speed near the ground ranges from 1 km/h (0 mph) in June to 1 km/h (1 mph) in September. Daylight lasts from about 8.2 hours in December to 16.2 hours in June.
Best time to visit Chilliwack
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–September: average highs of 21 °C71 °F to 25 °C78 °F with 42 mm1.6 in to 97 mm3.8 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 6 °C43 °F and very wet (257 mm10 in).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Chilliwack
- Winter (December–February) — highs 541 to 7 °C44 °F, lows around 0 °C31 °F, about 213 mm8.4 in of precipitation a month. Pack a warm coat, layers and closed shoes, shoes with good grip, as frost is common and a good rain jacket or umbrella and quick-drying shoes.
- Spring (March–May) — highs 948 to 19 °C66 °F, lows 236 to 9 °C49 °F, about 143 mm5.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Summer (June–August) — highs 2171 to 25 °C78 °F, lows 1254 to 15 °C60 °F, about 57 mm2.2 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
- Autumn (September–November) — highs 948 to 22 °C71 °F, lows 338 to 12 °C54 °F, about 191 mm7.5 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
How Chilliwack compares
Compared with Abbotsford, about 25 km to the southwest, Chilliwack is on average 1 °C1.8 °F warmer and receives 29% more precipitation (1,815 mm71 in vs 1,403 mm55 in). The difference is largest in July (2.2 °C3.9 °F warmer).
Of the 40 places in Canada covered by World Climates, Chilliwack is the warmest by annual mean temperature and the 3rd wettest by annual precipitation. See all of them on the Canada climate page.
Places in other countries with the most similar temperature and rainfall pattern: Everett (United States, Csb), Seattle (United States, Csb) and Hillsboro (United States, Csb).
Nearby places
- Abbotsford 25 km · 10 °C50 °F · 1,403 mm55 in
- Coquitlam 62 km · 10 °C50 °F · 2,333 mm92 in
- Surrey 64 km · 10 °C51 °F · 1,283 mm51 in
- Burnaby 73 km · 10 °C50 °F · 2,174 mm86 in
- Vancouver 85 km · 11 °C51 °F · 1,283 mm51 in
- Victoria 131 km · 11 °C51 °F · 991 mm39 in
- Everett 133 km · 11 °C52 °F · 1,253 mm49 in
- Seattle 176 km · 11 °C52 °F · 1,232 mm49 in
Frequently asked questions
What is the warmest month in Chilliwack?
August is the warmest month in Chilliwack, with an average high of 25 °C (78 °F) and an average low of 15 °C (60 °F).
What is the coldest month in Chilliwack?
December is the coldest month, with an average high of 5 °C (41 °F) and an average low of 0 °C (31 °F).
When does it rain the most in Chilliwack?
November is the wettest month with about 279 mm (11.0 in) of precipitation; July is the driest with about 42 mm (1.6 in).
What is the best time to visit Chilliwack?
Judging by long-term averages, the most comfortable months are June–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 677 m, while Chilliwack lies at about 11 m. Temperatures on this page were therefore adjusted by +4.3 °C7.8 °F using the standard lapse rate of 6.5 °C per 1,000 m.