Climate averages 1991–2020
Chilliwack weather
in August.
A warm, moderately wet month: the warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Chilliwack: daytime highs average 23.8°C and nights cool to about 14.3°C. By daytime temperature it is the warmest month of the year.
Expect about 74 mm of rain on roughly 9 days, which makes August a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 24 min on an average August day.
The nearest other city in this atlas is Abbotsford (25 km away). In August its highs average 22.8°C, 1.0°C cooler than Chilliwack, with 61 mm of rain.
Among the 86 cities listed in Canada, Chilliwack ranks joint 51st of 86 for the warmest August highs and joint 39th of 86 for the driest August (rainfall, lowest first). The mean August high of those 86 cities is 23.8°C; Chilliwack is level with that mean.
From August to September, average highs fall by 3.3°C to 20.5°C, and monthly rainfall rises from 74 mm to 124 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Chilliwack climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.2°C-1.0°C | -1.0°C | 342 | 19.7 | 8.79 h |
| February | 6.3°C-0.4°C | -0.4°C | 213 | 16.5 | 10.110 h |
| March | 8.7°C1.4°C | 1.4°C | 263 | 20.0 | 11.912 h |
| April | 12.5°C4.1°C | 4.1°C | 172 | 17.3 | 13.714 h |
| May | 17.5°C8.0°C | 8.0°C | 122 | 14.8 | 15.315 h |
| June | 19.8°C11.2°C | 11.2°C | 102 | 14.4 | 16.116 h |
| July | 23.4°C14.1°C | 14.1°C | 61 | 8.8 | 15.816 h |
| August, selected | 23.8°C14.3°C | 14.3°C | 74 | 8.6 | 14.414 h |
| September | 20.5°C11.4°C | 11.4°C | 124 | 11.1 | 12.713 h |
| October | 13.9°C6.7°C | 6.7°C | 256 | 17.4 | 10.811 h |
| November | 7.6°C2.1°C | 2.1°C | 372 | 20.5 | 9.29 h |
| December | 3.9°C-0.7°C | -0.7°C | 327 | 20.1 | 8.38 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Abbotsford in AugustCanada · 25 kmHigh 22.8°C · Low 12.8°C · 61 mm rain
- Maple Ridge in AugustCanada · 48 kmHigh 23.3°C · Low 13.8°C · 107 mm rain
- Langley in AugustCanada · 52 kmHigh 23.5°C · Low 13.6°C · 49 mm rain
- Bellingham in AugustUnited States · 60 kmHigh 21.7°C · Low 14.2°C · 46 mm rain
- Coquitlam in AugustCanada · 62 kmHigh 23.3°C · Low 14.4°C · 84 mm rain
- Surrey in AugustCanada · 64 kmHigh 23.0°C · Low 13.3°C · 49 mm rain
- New Westminster in AugustCanada · 70 kmHigh 22.6°C · Low 13.4°C · 73 mm rain
- Burnaby in AugustCanada · 73 kmHigh 22.4°C · Low 14.3°C · 73 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Chilliwack) is explained once on the Chilliwack year overview and on the Sources, method and limits page.