Thunder Bay District (Thunder Bay)
September
Weather in Thunder Bay District for September 2025
Your guide to Thunder Bay District weather in September - trends and predictions
In general, the average temperature in Thunder Bay District at the beginning of September is 22.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.3 °C by the end of September.
Thunder Bay District sees moderate rainfall in September, averaging 8 rainy days.
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22
Dry days
8
Rainy days
0
Snow days
19°/10°
Temperatures
15 km/h
Avg max wind
80 %
Avg humidity
Thunder Bay District in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  22° | 2  26° | 3  27° | 4 24° | 5  24° | 6 17° | 7 19° |
| 8 20° | 9  18° | 10 20° | 11  19° | 12 18° | 13 21° | 14 19° |
| 15 22° | 16 21° | 17 19° | 18 19° | 19 19° | 20 20° | 21 21° |
| 22 18° | 23 17° | 24 17° | 25 21° | 26 19° | 27 19° | 28 20° |
| 29 19° | 30 20° |
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Temperatures trend during September in Thunder Bay District
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy rain possible | 22° /10° | 0.1 mm | 6 | |
| 2 Sept. | Sunny | 26° /12° | 0 mm | 7 | |
| 3 Sept. | Partly cloudy | 27° /14° | 0.2 mm | 7 | |
| 4 Sept. | Partly cloudy | 24° /15° | 0 mm | 6 | |
| 5 Sept. | Fog | 24° /12° | 6.2 mm | 6 | |
| 6 Sept. | Light rain shower | 17° /7° | 16.5 mm | 4 | |
| 7 Sept. | Partly cloudy | 19° /5° | 0 mm | 6 | |
| 8 Sept. | Mist | 20° /5° | 0 mm | 5 | |
| 9 Sept. | Light drizzle | 18° /10° | 5.9 mm | 5 | |
| 10 Sept. | Light rain shower | 20° /11° | 1.5 mm | 5 | |
| 11 Sept. | Overcast | 19° /11° | 0 mm | 5 | |
| 12 Sept. | Overcast | 18° /9° | 0 mm | 5 | |
| 13 Sept. | Sunny | 21° /9° | 0 mm | 6 | |
| 14 Sept. | Mist | 19° /8° | 0 mm | 5 | |
| 15 Sept. | Mist | 22° /13° | 0.9 mm | 5 | |
| 16 Sept. | Mist | 21° /13° | 3.7 mm | 5 | |
| 17 Sept. | Overcast | 19° /11° | 6.2 mm | 5 | |
| 18 Sept. | Overcast | 19° /11° | 7.8 mm | 5 | |
| 19 Sept. | Mist | 19° /10° | 0 mm | 5 | |
| 20 Sept. | Patchy rain possible | 20° /14° | 0.5 mm | 5 | |
| 21 Sept. | Mist | 21° /12° | 0 mm | 5 | |
| 22 Sept. | Light rain shower | 18° /11° | 6 mm | 4 | |
| 23 Sept. | Patchy rain possible | 17° /9° | 0 mm | 5 | |
| 24 Sept. | Overcast | 17° /9° | 0 mm | 4 | |
| 25 Sept. | Overcast | 21° /10° | 0 mm | 5 | |
| 26 Sept. | Partly cloudy | 19° /11° | 0 mm | 5 | |
| 27 Sept. | Fog | 19° /10° | 0 mm | 5 | |
| 28 Sept. | Mist | 20° /10° | 0 mm | 5 | |
| 29 Sept. | Fog | 19° /11° | 0.9 mm | 5 | |
| 30 Sept. | Light rain shower | 20° /9° | 1.7 mm | 5 | |
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Important Notice
Our weather forecast for Thunder Bay District in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Thunder Bay District forecast closer to your planned date for the most up-to-date weather information.
Thunder Bay District in September - FAQ
What are the expected maximum and minimum temperatures in Thunder Bay District during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Thunder Bay District during September?
Moderate rainfall is anticipated in Thunder Bay District during September, with a total of 70.9 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Thunder Bay District during September?
The average wind speed in Thunder Bay District during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Thunder Bay District
Explore the daily rainfall trends and prepare for Thunder Bay Districts September weather 💧
UV exposure in Thunder Bay District during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Thunder Bay District?Get accurate weather forecasts for Thunder Bay District, located at latitude 48.382 and longitude -89.25. Stay updated with localized weather information tailored for Thunder Bay District.
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