Climate averages 1991–2020
Greater Sudbury weather
in September.
A mild, wet month: the 4th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Greater Sudbury: daytime highs average 18.6°C and nights cool to about 10.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 92 mm of rain on roughly 11 days, which makes September a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 36 min on an average September day.
The nearest other city in this atlas is Barrie (254 km away). In September its highs average 20.1°C, 1.5°C warmer than Greater Sudbury, with 80 mm of rain.
Among the 86 cities listed in Canada, Greater Sudbury ranks joint 68th of 86 for the warmest September highs and joint 53rd of 86 for the driest September (rainfall, lowest first). The mean September high of those 86 cities is 19.8°C; Greater Sudbury is 1.2°C cooler than that mean.
From September to October, average highs fall by 7.7°C to 10.9°C, and monthly rainfall rises from 92 mm to 94 mm.
The annual picture
September in context
Monthly precipitation
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
Greater Sudbury climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -7.4°C-16.7°C | -16.7°C | 53 | 10.1 | 9.09 h |
| February | -5.7°C-15.2°C | -15.2°C | 41 | 7.7 | 10.310 h |
| March | 0.4°C-9.4°C | -9.4°C | 50 | 7.8 | 11.912 h |
| April | 8.2°C-2.0°C | -2.0°C | 70 | 9.8 | 13.514 h |
| May | 16.8°C5.8°C | 5.8°C | 72 | 10.6 | 15.015 h |
| June | 22.1°C12.1°C | 12.1°C | 81 | 10.7 | 15.716 h |
| July | 24.2°C15.0°C | 15.0°C | 87 | 10.7 | 15.415 h |
| August | 23.0°C14.4°C | 14.4°C | 90 | 11.2 | 14.214 h |
| September, selected | 18.6°C10.5°C | 10.5°C | 92 | 11.0 | 12.613 h |
| October | 10.9°C3.9°C | 3.9°C | 94 | 12.7 | 10.911 h |
| November | 3.3°C-3.4°C | -3.4°C | 73 | 11.0 | 9.59 h |
| December | -3.4°C-11.4°C | -11.4°C | 59 | 11.1 | 8.79 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
- Barrie in SeptemberCanada · 254 kmHigh 20.1°C · Low 12.2°C · 80 mm rain
- Sault Ste. Marie in SeptemberCanada · 256 kmHigh 18.8°C · Low 12.0°C · 108 mm rain
- Newmarket in SeptemberCanada · 296 kmHigh 20.8°C · Low 12.2°C · 73 mm rain
- Caledon in SeptemberCanada · 302 kmHigh 19.9°C · Low 11.2°C · 74 mm rain
- Richmond Hill in SeptemberCanada · 316 kmHigh 20.9°C · Low 12.7°C · 69 mm rain
- Vaughan in SeptemberCanada · 317 kmHigh 21.0°C · Low 13.0°C · 69 mm rain
- Peterborough, Canada in SeptemberCanada · 321 kmHigh 20.7°C · Low 12.6°C · 85 mm rain
- Markham in SeptemberCanada · 321 kmHigh 21.1°C · Low 13.3°C · 81 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 Greater Sudbury) is explained once on the Greater Sudbury year overview and on the Sources, method and limits page.