Thunder Bay District (Thunder Bay)
September
Weather in Thunder Bay District for September 2026
Your guide to Thunder Bay District weather in September - trends and predictions
Until now, September 2026 in Thunder Bay District is slightly cooler than the historical average by 0.6 °C.
The forecast for the next days in Thunder Bay District predicts a temperature of 12.3 °C, which is cooler than the historical average.
In general, the average temperature in Thunder Bay District at the beginning of September is 21.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.6 °C by the end of September.
The climate of Thunder Bay District in September is notably wet, with an average of 15 rainy days, and a total of 113.7 mm of precipitation.
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Temperatures
Rain 🌧️
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15
Dry days
15
Rainy days
0
Snow days
19°/11°
Temperatures
15 km/h
Avg max wind
79 %
Avg humidity
Thunder Bay District Weather September
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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 in Thunder Bay District day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 24° /12° | 0 mm | 5 | |
| 2 Sept. | Sunny | 25° /12° | 3.2 mm | 6 | |
| 3 Sept. |  Partly cloudy | 23° /10° | 12.6 mm | 5 | |
| 4 Sept. | Partly cloudy | 19° /12° | 6.7 mm | 4 | |
| 5 Sept. |  Fog | 20° /10° | 3.1 mm | 5 | |
| 6 Sept. |  Light rain shower | 19° /7° | 8.3 mm | 4 | |
| 7 Sept. | Partly cloudy | 18° /8° | 0.4 mm | 4 | |
| 8 Sept. | Mist | 20° /9° | 30.9 mm | 4 | |
| 9 Sept. |  Light drizzle | 18° /11° | 7.6 mm | 5 | |
| 10 Sept. | Light rain shower | 19° /10° | 0.8 mm | 5 | |
| 11 Sept. |  Overcast | 20° /11° | 1.5 mm | 4 | |
| 12 Sept. | Overcast | 17° /10° | 4.6 mm | 3 | |
| 13 Sept. | Sunny | 19° /10° | 0.1 mm | 4 | |
| 14 Sept. | Mist | 17° /9° | 2.7 mm | 4 | |
| 15 Sept. | Mist | 19° /12° | 1.4 mm | 4 | |
| 16 Sept. | Mist | 20° /11° | 1.9 mm | 4 | |
| 17 Sept. | Overcast | 20° /11° | 3.2 mm | 4 | |
| 18 Sept. | Overcast | 17° /11° | 3.9 mm | 4 | |
| 19 Sept. | Overcast | 16° /10° | 0 mm | 4 | |
| 20 Sept. | Patchy rain possible | 17° /11° | 1.4 mm | 4 | |
| 21 Sept. | Mist | 18° /11° | 0.9 mm | 4 | |
| 22 Sept. | Light rain shower | 17° /10° | 33.2 mm | 4 | |
| 23 Sept. | Sunny | 17° /10° | 0 mm | 4 | |
| 24 Sept. | Overcast | 16° /10° | 0 mm | 3 | |
| 25 Sept. | Mist | 20° /11° | 0.1 mm | 4 | |
| 26 Sept. | Partly cloudy | 18° /10° | 0 mm | 4 | |
| 27 Sept. | Overcast | 16° /13° | 0.1 mm | 1.3 | |
| 28 Sept. | Sunny | 15° /12° | 0 mm | 4 | |
| 29 Sept. | Overcast | 16° /14° | 6.2 mm | 1.9 | |
| 30 Sept. | Fog | 15° /13° | 2 mm | 3.9 | |
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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.
Change Month
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 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Thunder Bay District during September?
Significant rainfall exceeding 113.7 mm is expected in Thunder Bay District during September, occurring over more than 15 days. Preparing for wet conditions is recommended in your planning.
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 💧
Typically, Thunder Bay District has 15 rainy days in September with a total of 113.7 mm of rainfall.
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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