Duluth (MN)
September
Weather in Duluth, Minnesota for September 2025
Your guide to Duluth weather in September - trends and predictions
In general, the average temperature in Duluth at the beginning of September is 21 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 24.3 °F by the end of September.
Duluth experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 36.1 mm.
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Temperatures
Rain 🌧️
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23
Dry days
7
Rainy days
0
Snow days
24°/13°
Temperatures
15 km/h
Avg max wind
71 %
Avg humidity
Duluth Weather September
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Temperatures trend during September in Duluth
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September weather in Duluth day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 21° /12° | 0 mm | 6 | |
| Sept. 2 | Sunny | 22° /11° | 0 mm | 6 | |
| Sept. 3 |  Overcast | 24° /13° | 0 mm | 5 | |
| Sept. 4 |  Partly cloudy | 26° /16° | 0 mm | 7 | |
| Sept. 5 |  Heavy rain at times | 20° /13° | 6.1 mm | 5 | |
| Sept. 6 |  Moderate or heavy rain shower | 15° /9° | 2.1 mm | 4 | |
| Sept. 7 | Sunny | 19° /7° | 0 mm | 5 | |
| Sept. 8 | Partly cloudy | 25° /10° | 0 mm | 7 | |
| Sept. 9 | Partly cloudy | 22° /13° | 0 mm | 6 | |
| Sept. 10 |  Patchy rain possible | 23° /15° | 0.1 mm | 5 | |
| Sept. 11 | Partly cloudy | 27° /15° | 0 mm | 7 | |
| Sept. 12 | Sunny | 21° /15° | 0 mm | 6 | |
| Sept. 13 | Sunny | 22° /14° | 0 mm | 6 | |
| Sept. 14 | Patchy rain possible | 22° /15° | 0.6 mm | 5 | |
| Sept. 15 | Patchy rain possible | 27° /15° | 0.2 mm | 6 | |
| Sept. 16 | Moderate rain at times | 27° /18° | 2.9 mm | 6 | |
| Sept. 17 | Partly cloudy | 28° /18° | 0 mm | 7 | |
| Sept. 18 | Sunny | 29° /20° | 0 mm | 7 | |
| Sept. 19 | Moderate or heavy rain shower | 28° /18° | 12.4 mm | 6 | |
| Sept. 20 | Partly cloudy | 26° /18° | 10 mm | 7 | |
| Sept. 21 | Heavy rain at times | 27° /14° | 1.8 mm | 6 | |
| Sept. 22 | Sunny | 20° /10° | 0 mm | 6 | |
| Sept. 23 | Sunny | 21° /10° | 0 mm | 6 | |
| Sept. 24 | Partly cloudy | 21° /10° | 0 mm | 6 | |
| Sept. 25 | Overcast | 27° /10° | 0 mm | 6 | |
| Sept. 26 | Sunny | 26° /15° | 0 mm | 7 | |
| Sept. 27 |  Cloudy | 28° /13° | 0 mm | 6 | |
| Sept. 28 | Sunny | 26° /13° | 0 mm | 7 | |
| Sept. 29 | Partly cloudy | 19° /12° | 0 mm | 5 | |
| Sept. 30 |  Mist | 23° /9° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Duluth 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 Duluth forecast closer to your planned date for the most up-to-date weather information.
Change Month
Duluth in September - FAQ
What are the expected maximum and minimum temperatures in Duluth during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Duluth during September?
In September, Duluth can expect light to moderate rainfall, totaling 36.1 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Duluth during September?
The average wind speed in Duluth during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Duluth
Explore the daily rainfall trends and prepare for Duluths September weather 💧
UV exposure in Duluth during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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