Climate averages 1991–2020
Sault Ste. Marie weather
in September.
A mild, wet month: the 4th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Sault Ste. Marie: daytime highs average 18.8°C and nights cool to about 12.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 108 mm of rain on roughly 12 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 36 min on an average September day.
The nearest other city in this atlas is Greater Sudbury (256 km away). In September its highs average 18.6°C, about as warm as Sault Ste. Marie, with 92 mm of rain.
Among the 86 cities listed in Canada, Sault Ste. Marie ranks joint 65th of 86 for the warmest September highs and joint 76th of 86 for the driest September (rainfall, lowest first). The mean September high of those 86 cities is 19.8°C; Sault Ste. Marie is 0.9°C cooler than that mean.
From September to October, average highs fall by 7.3°C to 11.5°C, and monthly rainfall falls from 108 mm to 101 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
Sault Ste. Marie climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -6.5°C-13.1°C | -13.1°C | 46 | 10.2 | 9.09 h |
| February | -6.0°C-12.6°C | -12.6°C | 36 | 7.6 | 10.310 h |
| March | -0.5°C-7.6°C | -7.6°C | 46 | 8.3 | 11.912 h |
| April | 7.0°C-1.4°C | -1.4°C | 67 | 10.2 | 13.514 h |
| May | 15.4°C5.6°C | 5.6°C | 72 | 10.0 | 15.015 h |
| June | 21.0°C11.8°C | 11.8°C | 81 | 9.8 | 15.816 h |
| July | 23.3°C15.4°C | 15.4°C | 101 | 11.4 | 15.415 h |
| August | 22.8°C15.5°C | 15.5°C | 95 | 10.9 | 14.214 h |
| September, selected | 18.8°C12.0°C | 12.0°C | 108 | 12.1 | 12.613 h |
| October | 11.5°C5.5°C | 5.5°C | 101 | 13.7 | 10.911 h |
| November | 4.4°C-0.8°C | -0.8°C | 67 | 11.2 | 9.59 h |
| December | -1.7°C-7.7°C | -7.7°C | 56 | 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
- Greater Sudbury in SeptemberCanada · 256 kmHigh 18.6°C · Low 10.5°C · 92 mm rain
- Green Bay in SeptemberUnited States · 363 kmHigh 21.5°C · Low 13.3°C · 67 mm rain
- Flint in SeptemberUnited States · 393 kmHigh 22.2°C · Low 13.5°C · 72 mm rain
- Appleton in SeptemberUnited States · 405 kmHigh 21.2°C · Low 13.0°C · 72 mm rain
- Grand Rapids in SeptemberUnited States · 409 kmHigh 22.1°C · Low 13.6°C · 79 mm rain
- Wyoming in SeptemberUnited States · 415 kmHigh 22.1°C · Low 13.5°C · 79 mm rain
- Lansing in SeptemberUnited States · 421 kmHigh 22.3°C · Low 13.5°C · 71 mm rain
- Sarnia in SeptemberCanada · 422 kmHigh 21.7°C · Low 14.7°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 Sault Ste. Marie) is explained once on the Sault Ste. Marie year overview and on the Sources, method and limits page.