Owen Sound Weather in September
What's the weather like in Owen Sound (Ontario) in September 2025?
The climate in Owen Sound during September can be summarized as mild and damp.
September is in the fall / autumn in Owen Sound and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (67°F), whilst at night 10°C (50°F) is normal.
| Daytime temperature | 19.5°C 67°F |
|---|---|
| Nightly temperature | 10.2°C 50.3°F |
| Average temperature | 14.8°C 58.6°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 103 mm 4 ins |
| Rainy days | 14 days |
| Sea temperature | 17.8°C 64°F |
| Humidity | 80% |
| Windspeed | 13kph 8 mph |
On average September is the 4th wettest month of the year in Owen Sound with around 103mm 4 inches of rain making it a damp time to visit. This rainfall is typically spread over 14 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 Owen Sound
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 Owen Sound in September 2025.
Other monthly averages
Best places to visit in September
Owen Sound weather stats
| Hottest month: | July | 24.3°C 75.7°F |
|---|---|---|
| Driest month: | May | 65mm 2.6ins |
| Sunniest month: | July | 10.4hrs |
| Coldest month: | January | -3.1°C 26.4°F |
| Wettest month: | December | 119mm 4.7ins |
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