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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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Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/10°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
80 %
Avg humidity

Thunder Bay District in September average weather

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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
Patchy rain possible
22° /10° 0.1 mm 6
2 Sept. Sunny
Sunny
26° /12° 0 mm 7
3 Sept. Partly cloudy
Partly cloudy
27° /14° 0.2 mm 7
4 Sept. Partly cloudy
Partly cloudy
24° /15° 0 mm 6
5 Sept. Fog
Fog
24° /12° 6.2 mm 6
6 Sept. Light rain shower
Light rain shower
17° /7° 16.5 mm 4
7 Sept. Partly cloudy
Partly cloudy
19° /5° 0 mm 6
8 Sept. Mist
Mist
20° /5° 0 mm 5
9 Sept. Light drizzle
Light drizzle
18° /10° 5.9 mm 5
10 Sept. Light rain shower
Light rain shower
20° /11° 1.5 mm 5
11 Sept. Overcast
Overcast
19° /11° 0 mm 5
12 Sept. Overcast
Overcast
18° /9° 0 mm 5
13 Sept. Sunny
Sunny
21° /9° 0 mm 6
14 Sept. Mist
Mist
19° /8° 0 mm 5
15 Sept. Mist
Mist
22° /13° 0.9 mm 5
16 Sept. Mist
Mist
21° /13° 3.7 mm 5
17 Sept. Overcast
Overcast
19° /11° 6.2 mm 5
18 Sept. Overcast
Overcast
19° /11° 7.8 mm 5
19 Sept. Mist
Mist
19° /10° 0 mm 5
20 Sept. Patchy rain possible
Patchy rain possible
20° /14° 0.5 mm 5
21 Sept. Mist
Mist
21° /12° 0 mm 5
22 Sept. Light rain shower
Light rain shower
18° /11° 6 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
17° /9° 0 mm 5
24 Sept. Overcast
Overcast
17° /9° 0 mm 4
25 Sept. Overcast
Overcast
21° /10° 0 mm 5
26 Sept. Partly cloudy
Partly cloudy
19° /11° 0 mm 5
27 Sept. Fog
Fog
19° /10° 0 mm 5
28 Sept. Mist
Mist
20° /10° 0 mm 5
29 Sept. Fog
Fog
19° /11° 0.9 mm 5
30 Sept. Light rain shower
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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Location coordinates 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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