Saint Louis County (Duluth)
September
Weather in Saint Louis County, Minnesota for September 2026
Your guide to Saint Louis County weather in September - trends and predictions
Small Craft Advisory - See hour by hour.
The forecast for the next days in Saint Louis County predicts temperatures to be around 23 °F, close to the historical average.
In general, the average temperature in Saint Louis County at the beginning of September is 21.7 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 22.6 °F by the end of September.
The climate of Saint Louis County 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
Saint Louis County Weather September
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Temperatures trend during September in Saint Louis County
See the weather trend as well as the moving average line
September weather in Saint Louis County 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 | Sunny | 19° /15° | 0.3 mm | 5.1 | |
| Sept. 6 | Overcast | 19° /15° | 0 mm | 3.6 | |
| Sept. 7 | Overcast | 25° /17° | 1.4 mm | 4.5 | |
| Sept. 8 | Sunny | 30° /18° | 5.5 mm | 5.5 | |
| Sept. 9 | Sunny | 22° /15° | 0 mm | 6 | |
| Sept. 10 | Overcast | 14° /12° | 5.4 mm | 3 | |
| Sept. 11 | Overcast | 20° /13° | 0 mm | 5 | |
| Sept. 12 |  Patchy rain possible | 32° /16° | 2.4 mm | 8 | |
| Sept. 13 | Light rain shower | 22° /16° | 3.1 mm | 5 | |
| Sept. 14 | Light rain shower | 28° /15° | 5.4 mm | 6 | |
| Sept. 15 | Light rain shower | 22° /19° | 68.9 mm | 5 | |
| Sept. 16 | Light rain shower | 26° /13° | 17.3 mm | 6 | |
| Sept. 17 |  Cloudy | 14° /8° | 0.8 mm | 4 | |
| Sept. 18 | Sunny | 23° /16° | 0 mm | 6 | |
| Sept. 19 |  Moderate or heavy rain shower | 21° /15° | 12.8 mm | 5 | |
| Sept. 20 | Partly cloudy | 20° /15° | 7.4 mm | 5 | |
| Sept. 21 |  Heavy rain at times | 23° /14° | 21.1 mm | 5 | |
| Sept. 22 | Sunny | 20° /11° | 0 mm | 6 | |
| Sept. 23 | Sunny | 20° /11° | 0 mm | 5 | |
| Sept. 24 | Partly cloudy | 20° /10° | 0 mm | 5 | |
| Sept. 25 | Overcast | 23° /11° | 0 mm | 5 | |
| Sept. 26 | Sunny | 21° /13° | 0 mm | 6 | |
| Sept. 27 | Cloudy | 26° /11° | 0 mm | 6 | |
| Sept. 28 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 29 | Partly cloudy | 23° /12° | 0 mm | 6 | |
| Sept. 30 |  Mist | 19° /11° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Saint Louis County 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 Saint Louis County forecast closer to your planned date for the most up-to-date weather information.
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Saint Louis County in September - FAQ
What are the expected maximum and minimum temperatures in Saint Louis County 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 Saint Louis County during September?
Significant rainfall exceeding 109.5 mm is expected in Saint Louis County during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Saint Louis County during September?
The average wind speed in Saint Louis County during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Saint Louis County
Explore the daily rainfall trends and prepare for Saint Louis Countys September weather 💧
Typically, Saint Louis County has 14 rainy days in September with a total of 109.5 mm of rainfall.
UV exposure in Saint Louis County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Saint Louis County?Get accurate weather forecasts for Saint Louis County, located at latitude 46.783 and longitude -92.107. Stay updated with localized weather information tailored for Saint Louis County.
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