Thunder Bay Weather in September
What's the weather like in Thunder Bay (Ontario) in September 2024?
The climate in Thunder Bay during September can be summarized as mild and a little damp.
September is in the fall / autumn in Thunder Bay and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 17°C (62°F), whilst at night 6°C (42°F) is normal.
| Daytime temperature | 16.7°C 62.1°F |
|---|---|
| Nightly temperature | 5.5°C 41.9°F |
| Average temperature | 11.1°C 52°F |
| Daily sunshine | 5.8 hrs |
| Avg rainfall | 88 mm 3.4 ins |
| Rainy days | 13 days |
| Sea temperature | 13.1°C 55.5°F |
| Humidity | 79% |
| Windspeed | 11.9kph 7 mph |
On average September is the 2nd wettest month of the year in Thunder Bay with around 88mm 3.4 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.8 hours of sunshine per day.
September temperatures in Thunder Bay
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 Thunder Bay in September 2024.
Other monthly averages
Best places to visit in September
Thunder Bay weather stats
| Hottest month: | July | 23.4°C 74.1°F |
|---|---|---|
| Driest month: | February | 27mm 1.1ins |
| Sunniest month: | July | 10.3hrs |
| Coldest month: | January | -9.5°C 14.9°F |
| Wettest month: | August | 88mm 3.5ins |
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