Brown County (Aberdeen)
September
Weather in Brown County, South Dakota for September 2026
Your guide to Brown County weather in September - trends and predictions
In general, the average temperature in Brown County at the beginning of September is 19.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 26.3 °F by the end of September.
With an average of 3 rainy days, Brown County experiences minimal rainfall in September.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
24°/13°
Temperatures
22 km/h
Avg max wind
74 %
Avg humidity
Brown County Weather September
Move between months or click on a day
Temperatures trend during September in Brown County
See the weather trend as well as the moving average line
September weather in Brown County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Fog | 22° /16° | 0 mm | 4 | |
| Sept. 2 |  Thundery outbreaks possible | 29° /16° | 0 mm | 7 | |
| Sept. 3 |  Overcast | 18° /10° | 0 mm | 5 | |
| Sept. 4 | Overcast | 17° /5° | 0 mm | 5 | |
| Sept. 5 | Overcast | 14° /9° | 0 mm | 6 | |
| Sept. 6 | Overcast | 15° /6° | 0 mm | 6 | |
| Sept. 7 |  Sunny | 21° /6° | 0 mm | 6 | |
| Sept. 8 | Thundery outbreaks possible | 28° /12° | 0 mm | 6 | |
| Sept. 9 | Fog | 27° /16° | 0 mm | 6 | |
| Sept. 10 | Fog | 29° /14° | 0 mm | 6 | |
| Sept. 11 | Overcast | 27° /16° | 0 mm | 6 | |
| Sept. 12 |  Patchy light rain with thunder | 28° /18° | 20.8 mm | 3 | |
| Sept. 13 | Fog | 26° /20° | 0 mm | 3 | |
| Sept. 14 | Fog | 30° /19° | 0 mm | 3 | |
| Sept. 15 | Fog | 30° /15° | 0 mm | 6 | |
| Sept. 16 | Fog | 30° /15° | 0 mm | 5 | |
| Sept. 17 |  Moderate or heavy rain shower | 19° /16° | 23 mm | 1 | |
| Sept. 18 | Fog | 21° /16° | 6.8 mm | 1 | |
| Sept. 19 | Mist | 17° /15° | 0 mm | 1 | |
| Sept. 20 | Fog | 18° /15° | 0 mm | 2 | |
| Sept. 21 | Fog | 23° /13° | 0 mm | 4 | |
| Sept. 22 | Thundery outbreaks possible | 26° /12° | 0 mm | 5 | |
| Sept. 23 |  Partly cloudy | 26° /14° | 0 mm | 4 | |
| Sept. 24 | Fog | 24° /13° | 0 mm | 4 | |
| Sept. 25 | Mist | 28° /11° | 0 mm | 4 | |
| Sept. 26 | Mist | 28° /10° | 0 mm | 4 | |
| Sept. 27 | Sunny | 22° /9° | 0 mm | 4 | |
| Sept. 28 | Sunny | 25° /8° | 0 mm | 4 | |
| Sept. 29 | Overcast | 30° /16° | 0 mm | 4 | |
| Sept. 30 | Overcast | 27° /16° | 0 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Brown 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 Brown County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Brown County in September - FAQ
What are the expected maximum and minimum temperatures in Brown County 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 Brown County during September?
Moderate rainfall is anticipated in Brown County during September, with a total of 50.6 mm spread over approximately 3 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Brown County during September?
The average wind speed in Brown County during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Brown County
Explore the daily rainfall trends and prepare for Brown Countys September weather 💧
Typically, Brown County has 3 rainy days in September with a total of 50.6 mm of rainfall.
UV exposure in Brown County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Brown County
Select a location for an accurate weather forecast
More Locations Quick links
More Brown County weather pages
You are here
Where is Brown County?Get accurate weather forecasts for Brown County, located at latitude 45.465 and longitude -98.486. Stay updated with localized weather information tailored for Brown County.
Found a mistake?
We appreciate your attention to details. Tell us here.