Climate averages 1991–2020
Delta weather
in September.
A mild, moderately 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 Delta: daytime highs average 19.6°C and nights cool to about 12.0°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 72 mm of rain on roughly 8 days, which makes September a moderately 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 New Westminster (17 km away). In September its highs average 19.3°C, about as warm as Delta, with 125 mm of rain.
Among the 86 cities listed in Canada, Delta ranks joint 54th of 86 for the warmest September highs and 21st of 86 for the driest September (rainfall, lowest first). The mean September high of those 86 cities is 19.8°C; Delta is 0.2°C cooler than that mean.
From September to October, average highs fall by 6.0°C to 13.6°C, and monthly rainfall rises from 72 mm to 155 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
Delta climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.1°C1.4°C | 1.4°C | 209 | 18.0 | 8.79 h |
| February | 7.7°C1.6°C | 1.6°C | 125 | 14.3 | 10.110 h |
| March | 9.8°C3.1°C | 3.1°C | 156 | 17.3 | 11.912 h |
| April | 12.8°C5.4°C | 5.4°C | 109 | 13.7 | 13.714 h |
| May | 16.8°C8.8°C | 8.8°C | 69 | 10.1 | 15.315 h |
| June | 19.2°C11.6°C | 11.6°C | 49 | 8.1 | 16.116 h |
| July | 22.8°C14.2°C | 14.2°C | 28 | 4.6 | 15.816 h |
| August | 23.0°C14.4°C | 14.4°C | 41 | 4.8 | 14.414 h |
| September, selected | 19.6°C12.0°C | 12.0°C | 72 | 8.2 | 12.713 h |
| October | 13.6°C7.9°C | 7.9°C | 155 | 14.3 | 10.811 h |
| November | 8.6°C4.0°C | 4.0°C | 232 | 18.4 | 9.29 h |
| December | 5.7°C1.4°C | 1.4°C | 198 | 17.7 | 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
- New Westminster in SeptemberCanada · 17 kmHigh 19.3°C · Low 10.7°C · 125 mm rain
- Surrey in SeptemberCanada · 17 kmHigh 19.6°C · Low 10.7°C · 86 mm rain
- Vancouver in SeptemberCanada · 18 kmHigh 18.6°C · Low 11.9°C · 125 mm rain
- Burnaby in SeptemberCanada · 21 kmHigh 19.1°C · Low 11.8°C · 125 mm rain
- North Vancouver in SeptemberCanada · 25 kmHigh 18.8°C · Low 12.1°C · 125 mm rain
- Langley in SeptemberCanada · 29 kmHigh 20.1°C · Low 10.9°C · 86 mm rain
- Coquitlam in SeptemberCanada · 29 kmHigh 20.0°C · Low 11.7°C · 142 mm rain
- Maple Ridge in SeptemberCanada · 36 kmHigh 20.0°C · Low 10.9°C · 173 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 Delta) is explained once on the Delta year overview and on the Sources, method and limits page.