Casselman Weather in August
What's the weather like in Casselman (Ontario) in August 2025?
The climate in Casselman during August can be summarized as warm and a little damp.
August is in the summer in Casselman and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around 25°C (77°F), whilst at night 13°C (56°F) is normal.
| Daytime temperature | 24.8°C 76.6°F |
|---|---|
| Nightly temperature | 13.3°C 55.9°F |
| Average temperature | 19°C 66.2°F |
| Daily sunshine | 8 hrs |
| Avg rainfall | 97 mm 3.8 ins |
| Rainy days | 12 days |
| Sea temperature | 18°C 64.4°F |
| Humidity | 74% |
| Windspeed | 11.2kph 7 mph |
On average August is the wettest month of the year in Casselman with around 97mm 3.8 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 8 hours of sunshine per day.
August temperatures in Casselman
August rainfall
August 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 August 2025.
Other monthly averages
Best places to visit in August
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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