Saint Louis County (Duluth)
September
Weather in Saint Louis County, Minnesota for September 2027
Your guide to Saint Louis County weather in September - trends and predictions
In general, the average temperature in Saint Louis County at the beginning of September is 20 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 21.3 °F by the end of September.
Saint Louis County experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 138.4 mm.
Is September a good time to visit Saint Louis County? check out the best time to travel to Saint Louis County page.
✨ Is September a good time to visit Saint Louis County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
20
Dry days
10
Rainy days
0
Snow days
21°/13°
Temperatures
18 km/h
Avg max wind
77 %
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 |  Patchy rain possible | 25° /15° | 1 mm | 6 | |
| Sept. 2 |  Light rain | 22° /15° | 7.6 mm | 6 | |
| Sept. 3 | Light rain | 21° /12° | 3.1 mm | 5 | |
| Sept. 4 | Light rain | 20° /12° | 3.4 mm | 4 | |
| Sept. 5 |  Heavy rain at times | 17° /12° | 12.3 mm | 3 | |
| Sept. 6 | Patchy rain possible | 17° /11° | 0.7 mm | 5 | |
| Sept. 7 |  Sunny | 18° /9° | 0.4 mm | 3 | |
| Sept. 8 |  Heavy rain | 24° /12° | 55.4 mm | 4 | |
| Sept. 9 | Patchy rain possible | 22° /15° | 2.3 mm | 6 | |
| Sept. 10 | Patchy rain possible | 21° /13° | 0 mm | 5 | |
| Sept. 11 | Patchy rain possible | 23° /14° | 1.5 mm | 4 | |
| Sept. 12 |  Moderate rain | 19° /13° | 10.9 mm | 5 | |
| Sept. 13 | Sunny | 19° /12° | 0 mm | 5 | |
| Sept. 14 | Light rain | 18° /12° | 5.4 mm | 4 | |
| Sept. 15 | Patchy rain possible | 23° /13° | 0.5 mm | 5 | |
| Sept. 16 | Light rain | 25° /14° | 3 mm | 5 | |
| Sept. 17 | Patchy rain possible | 25° /17° | 1.1 mm | 5 | |
| Sept. 18 | Sunny | 20° /15° | 0 mm | 4 | |
| Sept. 19 |  Moderate or heavy rain shower | 19° /14° | 8.5 mm | 4 | |
| Sept. 20 | Light rain | 18° /13° | 5 mm | 4 | |
| Sept. 21 | Heavy rain at times | 20° /12° | 14.1 mm | 4 | |
| Sept. 22 | Sunny | 18° /10° | 0 mm | 5 | |
| Sept. 23 | Sunny | 18° /10° | 0 mm | 5 | |
| Sept. 24 |  Partly cloudy | 19° /10° | 0.3 mm | 4 | |
| Sept. 25 |  Overcast | 21° /11° | 0 mm | 5 | |
| Sept. 26 | Overcast | 20° /13° | 0 mm | 4 | |
| Sept. 27 |  Cloudy | 24° /12° | 0 mm | 4 | |
| Sept. 28 | Sunny | 23° /11° | 0 mm | 6 | |
| Sept. 29 | Patchy rain possible | 21° /12° | 1.8 mm | 4 | |
| Sept. 30 |  Mist | 21° /12° | 0.1 mm | 4 | |
| Next | |||||
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.
Change Month
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 138.4 mm is expected in Saint Louis County during September, occurring over more than 10 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 18 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 10 rainy days in September with a total of 138.4 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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