The temperatures in Sioux Falls in September are comfortable with low of 12°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in Sioux Falls during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Sioux Falls in September 2025.
If you’re planning to visit Sioux Falls in the near future, we highly recommend that you review the 14 day weather forecast for Sioux Falls before you arrive.
Temperatures
24° / 12°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
94
mm
Sun Hours
10.5
Hrs
