Weather in Sioux Falls in September
How warm is it in Sioux Falls in September?
In September the typical daytime high in Sioux Falls is 23.7 °C on average, from 26.4 °C at the start to 20.7 °C at the end of the month.
That is 3.6 °C cooler than in August and 8.0 °C warmer than in October.
The last 10 years were 1.6 °C warmer than more than 40 years ago.
Click a day for more: afternoon and night, the usual range, records and how fast it is warming.
Measured at the weather station Pipestone, 61 km away.