Thunder Bay District (Thunder Bay)
September
Weather in Thunder Bay District for September 2027
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 20.9 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 18.6 °C by the end of September.
Thunder Bay District experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 131.5 mm.
Is September a good time to visit Thunder Bay District? check out the best time to travel to Thunder Bay District page.
✨ Is September a good time to visit Thunder Bay District? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
23
Dry days
7
Rainy days
0
Snow days
19°/11°
Temperatures
16 km/h
Avg max wind
78 %
Avg humidity
Thunder Bay District Weather September
Move between months or click on a day
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
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 23° /13° | 0 mm | 5 | |
| 2 Sept. |  Light rain | 25° /13° | 3.2 mm | 6 | |
| 3 Sept. |  Moderate rain | 23° /11° | 12.6 mm | 5 | |
| 4 Sept. | Light rain | 19° /12° | 6.7 mm | 4 | |
| 5 Sept. | Light rain | 20° /11° | 3.1 mm | 5 | |
| 6 Sept. | Light rain | 18° /8° | 8.3 mm | 4 | |
| 7 Sept. |  Partly cloudy | 18° /8° | 0.4 mm | 4 | |
| 8 Sept. |  Heavy rain | 20° /9° | 30.9 mm | 4 | |
| 9 Sept. | Light rain | 18° /12° | 7.6 mm | 5 | |
| 10 Sept. |  Light rain shower | 19° /11° | 0.8 mm | 5 | |
| 11 Sept. | Patchy rain possible | 19° /11° | 1.5 mm | 4 | |
| 12 Sept. | Light rain | 17° /11° | 4.6 mm | 3 | |
| 13 Sept. | Sunny | 18° /11° | 0.1 mm | 4 | |
| 14 Sept. | Light rain | 17° /9° | 2.7 mm | 4 | |
| 15 Sept. | Patchy rain possible | 19° /13° | 1.4 mm | 4 | |
| 16 Sept. | Patchy rain possible | 20° /12° | 1.9 mm | 4 | |
| 17 Sept. | Light rain | 20° /11° | 3.2 mm | 4 | |
| 18 Sept. | Light rain | 16° /11° | 3.9 mm | 4 | |
| 19 Sept. |  Overcast | 16° /10° | 0 mm | 4 | |
| 20 Sept. | Patchy rain possible | 17° /12° | 1.4 mm | 4 | |
| 21 Sept. |  Mist | 17° /11° | 0.9 mm | 4 | |
| 22 Sept. | Heavy rain | 17° /11° | 33.2 mm | 4 | |
| 23 Sept. | Sunny | 16° /11° | 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° /11° | 0 mm | 4 | |
| 27 Sept. | Fog | 19° /11° | 0.1 mm | 4 | |
| 28 Sept. | Mist | 21° /10° | 0 mm | 4 | |
| 29 Sept. | Patchy rain possible | 19° /12° | 2.1 mm | 3.9 | |
| 30 Sept. | Light rain shower | 19° /11° | 0.9 mm | 3.8 | |
| 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.
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 131.5 mm is expected in Thunder Bay District during September, occurring over more than 7 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 16 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 7 rainy days in September with a total of 131.5 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 ☀️
Top locations in Thunder Bay District
Select a location for an accurate weather forecast
More Locations Quick links
More Thunder Bay District weather pages
You are here
Found a mistake?
We appreciate your attention to details. Tell us here.