Ottawa Weather in September
What's the weather like in Ottawa (Ontario) in September 2024?
The climate in Ottawa during September can be summarized as mild and a little damp.
September is in the fall / autumn in Ottawa and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (67°F), whilst at night 9°C (49°F) is normal.
| Daytime temperature | 19.6°C 67.3°F |
|---|---|
| Nightly temperature | 9.4°C 48.9°F |
| Average temperature | 14.5°C 58.1°F |
| Daily sunshine | 6.2 hrs |
| Avg rainfall | 80 mm 3.2 ins |
| Rainy days | 12 days |
| Sea temperature | 16.1°C 60.9°F |
| Humidity | 76% |
| Windspeed | 11.2kph 7 mph |
On average September is the 6th wettest month of the year in Ottawa with around 80mm 3.2 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 6.2 hours of sunshine per day.
September temperatures in Ottawa
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 Ottawa in September 2024.
Other monthly averages
Best places to visit in September
Ottawa weather stats
| Hottest month: | July | 25.9°C 78.6°F |
|---|---|---|
| Driest month: | February | 58mm 2.3ins |
| Sunniest month: | July | 9.7hrs |
| Coldest month: | January | -6.6°C 20.1°F |
| Wettest month: | July | 88mm 3.5ins |
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