Climate averages 1991–2020
New Westminster 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 New Westminster: daytime highs average 19.3°C and nights cool to about 10.7°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 125 mm of rain on roughly 10 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 Burnaby (7 km away). In September its highs average 19.1°C, about as warm as New Westminster, with 125 mm of rain.
Among the 86 cities listed in Canada, New Westminster ranks joint 59th of 86 for the warmest September highs and joint 80th of 86 for the driest September (rainfall, lowest first). The mean September high of those 86 cities is 19.8°C; New Westminster is 0.5°C cooler than that mean.
From September to October, average highs fall by 6.1°C to 13.2°C, and monthly rainfall rises from 125 mm to 246 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
New Westminster climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.0°C-0.5°C | -0.5°C | 316 | 19.0 | 8.79 h |
| February | 6.8°C-0.4°C | -0.4°C | 191 | 15.6 | 10.110 h |
| March | 9.2°C1.2°C | 1.2°C | 252 | 19.2 | 11.912 h |
| April | 12.6°C3.5°C | 3.5°C | 175 | 16.9 | 13.714 h |
| May | 16.6°C7.1°C | 7.1°C | 117 | 12.5 | 15.315 h |
| June | 18.9°C10.3°C | 10.3°C | 94 | 11.5 | 16.216 h |
| July | 22.4°C13.1°C | 13.1°C | 53 | 6.6 | 15.816 h |
| August | 22.6°C13.4°C | 13.4°C | 73 | 7.4 | 14.414 h |
| September, selected | 19.3°C10.7°C | 10.7°C | 125 | 10.2 | 12.713 h |
| October | 13.2°C6.5°C | 6.5°C | 246 | 16.3 | 10.811 h |
| November | 7.9°C2.4°C | 2.4°C | 349 | 19.9 | 9.29 h |
| December | 4.6°C-0.4°C | -0.4°C | 307 | 19.4 | 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
- Burnaby in SeptemberCanada · 7 kmHigh 19.1°C · Low 11.8°C · 125 mm rain
- Coquitlam in SeptemberCanada · 13 kmHigh 20.0°C · Low 11.7°C · 142 mm rain
- Surrey in SeptemberCanada · 13 kmHigh 19.6°C · Low 10.7°C · 86 mm rain
- Vancouver in SeptemberCanada · 16 kmHigh 18.6°C · Low 11.9°C · 125 mm rain
- Delta in SeptemberCanada · 17 kmHigh 19.6°C · Low 12.0°C · 72 mm rain
- North Vancouver in SeptemberCanada · 17 kmHigh 18.8°C · Low 12.1°C · 125 mm rain
- Langley in SeptemberCanada · 22 kmHigh 20.1°C · Low 10.9°C · 86 mm rain
- Maple Ridge in SeptemberCanada · 22 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 New Westminster) is explained once on the New Westminster year overview and on the Sources, method and limits page.
Vancouver, Burnaby and North Vancouver lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.