Climate averages 1991–2020
Chilliwack weather
in September.
A mild, wet month: the 3rd warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Chilliwack: daytime highs average 20.5°C and nights cool to about 11.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 124 mm of rain on roughly 11 days, which makes September a wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 39 min on an average September day.
The nearest other city in this atlas is Abbotsford (25 km away). In September its highs average 19.5°C, 1.0°C cooler than Chilliwack, with 102 mm of rain.
Among the 86 cities listed in Canada, Chilliwack ranks 30th of 86 for the warmest September highs and 79th of 86 for the driest September (rainfall, lowest first). The mean September high of those 86 cities is 19.8°C; Chilliwack is 0.7°C warmer than that mean.
From September to October, average highs fall by 6.6°C to 13.9°C, and monthly rainfall rises from 124 mm to 256 mm.
The annual picture
September 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 | 23.8°C14.3°C | 14.3°C | 74 | 8.6 | 14.414 h |
| September, selected | 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
September in nearby cities
- Abbotsford in SeptemberCanada · 25 kmHigh 19.5°C · Low 9.8°C · 102 mm rain
- Maple Ridge in SeptemberCanada · 48 kmHigh 20.0°C · Low 10.9°C · 173 mm rain
- Langley in SeptemberCanada · 52 kmHigh 20.1°C · Low 10.9°C · 86 mm rain
- Bellingham in SeptemberUnited States · 60 kmHigh 19.0°C · Low 11.8°C · 81 mm rain
- Coquitlam in SeptemberCanada · 62 kmHigh 20.0°C · Low 11.7°C · 142 mm rain
- Surrey in SeptemberCanada · 64 kmHigh 19.6°C · Low 10.7°C · 86 mm rain
- New Westminster in SeptemberCanada · 70 kmHigh 19.3°C · Low 10.7°C · 125 mm rain
- Burnaby in SeptemberCanada · 73 kmHigh 19.1°C · Low 11.8°C · 125 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.