Duluth (MN)
September
Weather in Duluth, Minnesota for September 2026
Your guide to Duluth weather in September - trends and predictions
Until now, September 2026 in Duluth is slightly cooler than the historical average by 0.7 °F.
Expect cooler weather in the next days in Duluth with the forecast suggesting a temperature of 15.1 °F, lower than the historical average.
In general, the average temperature in Duluth at the beginning of September is 20.1 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 17.6 °F by the end of September.
The climate of Duluth in September is notably wet, with an average of 14 rainy days, and a total of 109.5 mm of precipitation.
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Temperatures
Rain 🌧️
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16
Dry days
14
Rainy days
0
Snow days
21°/13°
Temperatures
17 km/h
Avg max wind
76 %
Avg humidity
Duluth Weather September
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Temperatures trend during September in Duluth
See the weather trend as well as the moving average line
September weather in Duluth day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 26° /15° | 1 mm | 6 | |
| Sept. 2 | Sunny | 22° /14° | 7.6 mm | 6 | |
| Sept. 3 |  Overcast | 21° /12° | 3.1 mm | 5 | |
| Sept. 4 |  Partly cloudy | 20° /11° | 3.4 mm | 4 | |
| Sept. 5 |  Heavy rain at times | 17° /12° | 12.3 mm | 3 | |
| Sept. 6 |  Moderate or heavy rain shower | 17° /10° | 0.7 mm | 5 | |
| Sept. 7 | Sunny | 18° /9° | 0.4 mm | 3 | |
| Sept. 8 | Partly cloudy | 24° /12° | 55.4 mm | 4 | |
| Sept. 9 | Partly cloudy | 22° /15° | 2.3 mm | 6 | |
| Sept. 10 |  Patchy rain possible | 21° /13° | 0 mm | 5 | |
| Sept. 11 | Partly cloudy | 23° /14° | 1.5 mm | 4 | |
| Sept. 12 | Sunny | 19° /13° | 10.9 mm | 5 | |
| Sept. 13 | Sunny | 19° /12° | 0 mm | 5 | |
| Sept. 14 | Patchy rain possible | 18° /11° | 5.4 mm | 4 | |
| Sept. 15 | Patchy rain possible | 23° /13° | 0.5 mm | 5 | |
| Sept. 16 | Moderate rain at times | 25° /14° | 3 mm | 5 | |
| Sept. 17 | Partly cloudy | 25° /16° | 1.1 mm | 5 | |
| Sept. 18 | Sunny | 20° /14° | 0 mm | 4 | |
| Sept. 19 | Moderate or heavy rain shower | 19° /14° | 8.5 mm | 4 | |
| Sept. 20 | Overcast | 14° /11° | 0.2 mm | 5.2 | |
| Sept. 21 | Overcast | 13° /10° | 0 mm | 4.4 | |
| Sept. 22 | Sunny | 13° /8° | 0 mm | 4.8 | |
| Sept. 23 | Sunny | 14° /9° | 0 mm | 4.7 | |
| Sept. 24 | Overcast | 15° /10° | 1.6 mm | 4 | |
| Sept. 25 | Overcast | 20° /12° | 0.1 mm | 5 | |
| Sept. 26 | Sunny | 23° /14° | 0 mm | 6 | |
| Sept. 27 |  Cloudy | 22° /14° | 0.1 mm | 5 | |
| Sept. 28 |  Light drizzle | 18° /5° | 53 mm | 2 | |
| Sept. 29 | Overcast | 12° /5° | 0.2 mm | 4 | |
| Sept. 30 | Patchy rain possible | 13° /5° | 11.1 mm | 4 | |
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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 21° 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?
Significant rainfall exceeding 109.5 mm is expected in Duluth during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Duluth during September?
The average wind speed in Duluth during September is 17 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 💧
Typically, Duluth has 14 rainy days in September with a total of 109.5 mm of rainfall.
UV exposure in Duluth during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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