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 experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 58.2 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
21
Dry days
9
Rainy days
0
Snow days
20°/11°
Temperatures
15 km/h
Avg max wind
77 %
Avg humidity
Thunder Bay District in September average weather
Move between months or click on a day
| 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° |
You can click on date
Access Thunder Bay District weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Thunder Bay District
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| 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 | |
| Next | |||||
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 20° 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?
Moderate rainfall is anticipated in Thunder Bay District during September, with a total of 58.2 mm spread over approximately 9 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 ☀️
Top locations in Thunder Bay District
Select a location for an accurate weather forecast
More Locations Quick links
You are here
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.
Found a mistake?
We appreciate your attention to details. Tell us here.