Olmsted County (Rochester)
September
Weather in Olmsted County, Minnesota for September 2026
Your guide to Olmsted County weather in September - trends and predictions
So far, September 2026 in Olmsted County is slightly warmer than the historical average by 1 °F.
Expect cooler weather in the next days in Olmsted County with the forecast suggesting a temperature of 16.6 °F, lower than the historical average.
In general, the average temperature in Olmsted County at the beginning of September is 22.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.1 °F by the end of September.
Olmsted County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 57.2 mm.
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Temperatures
Rain 🌧️
More
21
Dry days
9
Rainy days
0
Snow days
23°/13°
Temperatures
19 km/h
Avg max wind
76 %
Avg humidity
Olmsted County Weather September
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Temperatures trend during September in Olmsted County
See the weather trend as well as the moving average line
September weather in Olmsted County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 24° /14° | 0 mm | 4 | |
| Sept. 2 |  Sunny | 25° /13° | 21 mm | 4 | |
| Sept. 3 | Sunny | 23° /14° | 37.5 mm | 4 | |
| Sept. 4 | Sunny | 24° /14° | 8.8 mm | 6 | |
| Sept. 5 | Overcast | 21° /13° | 0.1 mm | 3 | |
| Sept. 6 | Overcast | 19° /10° | 0.6 mm | 4 | |
| Sept. 7 | Sunny | 20° /9° | 0 mm | 4 | |
| Sept. 8 | Sunny | 24° /11° | 102 mm | 4 | |
| Sept. 9 | Sunny | 26° /15° | 0.5 mm | 6 | |
| Sept. 10 |  Patchy rain possible | 25° /14° | 0.3 mm | 6 | |
| Sept. 11 | Sunny | 24° /15° | 0 mm | 6 | |
| Sept. 12 | Sunny | 25° /14° | 2.3 mm | 5 | |
| Sept. 13 | Overcast | 25° /14° | 2.1 mm | 6 | |
| Sept. 14 | Light rain shower | 24° /15° | 21.7 mm | 5 | |
| Sept. 15 |  Thundery outbreaks possible | 25° /18° | 3.3 mm | 4 | |
| Sept. 16 |  Partly cloudy | 26° /15° | 0.4 mm | 5 | |
| Sept. 17 |  Mist | 25° /15° | 3.6 mm | 4 | |
| Sept. 18 | Partly cloudy | 24° /15° | 14 mm | 5 | |
| Sept. 19 | Thundery outbreaks possible | 22° /15° | 16.8 mm | 4 | |
| Sept. 20 | Overcast | 19° /10° | 0 mm | 5.8 | |
| Sept. 21 | Overcast | 16° /8° | 0.1 mm | 3.4 | |
| Sept. 22 | Overcast | 16° /9° | 0 mm | 3 | |
| Sept. 23 | Sunny | 19° /9° | 0 mm | 5.3 | |
| Sept. 24 | Overcast | 17° /12° | 0 mm | 4 | |
| Sept. 25 | Sunny | 21° /14° | 0 mm | 6 | |
| Sept. 26 | Sunny | 21° /13° | 0 mm | 6 | |
| Sept. 27 | Overcast | 21° /13° | 1 mm | 5 | |
| Sept. 28 | Overcast | 16° /5° | 30.1 mm | 2 | |
| Sept. 29 | Sunny | 12° /3° | 0 mm | 4 | |
| Sept. 30 | Sunny | 12° /8° | 0.5 mm | 4 | |
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Important Notice
Our weather forecast for Olmsted 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 Olmsted County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Olmsted County in September - FAQ
What are the expected maximum and minimum temperatures in Olmsted County during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Olmsted County during September?
Moderate rainfall is anticipated in Olmsted County during September, with a total of 57.2 mm spread over approximately 9 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Olmsted County during September?
The average wind speed in Olmsted County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Olmsted County
Explore the daily rainfall trends and prepare for Olmsted Countys September weather 💧
Typically, Olmsted County has 9 rainy days in September with a total of 57.2 mm of rainfall.
UV exposure in Olmsted County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Olmsted County?Get accurate weather forecasts for Olmsted County, located at latitude 44.022 and longitude -92.47. Stay updated with localized weather information tailored for Olmsted County.
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