Casselman Weather in September
What's the weather like in Casselman (Ontario) in September 2025?
The climate in Casselman during September can be summarized as mild and a little damp.
September is in the fall / autumn in Casselman and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (67°F), whilst at night 9°C (47°F) is normal.
| Daytime temperature | 19.7°C 67.4°F |
|---|---|
| Nightly temperature | 8.6°C 47.4°F |
| Average temperature | 14.1°C 57.4°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 91 mm 3.6 ins |
| Rainy days | 12 days |
| Sea temperature | 16.1°C 60.9°F |
| Humidity | 76% |
| Windspeed | 12.2kph 8 mph |
On average September is the 2nd wettest month of the year in Casselman with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
September temperatures in Casselman
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Casselman in September 2025.
Other monthly averages
Best places to visit in September
Casselman weather stats
| Hottest month: | July | 26.2°C 79.2°F |
|---|---|---|
| Driest month: | February | 58mm 2.3ins |
| Sunniest month: | July | 9.3hrs |
| Coldest month: | January | -6.3°C 20.7°F |
| Wettest month: | August | 97mm 3.8ins |
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