Weather in Sioux City in September
How warm is it in Sioux City in September?
In September the typical daytime high in Sioux City is 24.9 °C on average, from 27.5 °C at the start to 22.0 °C at the end of the month.
That is 3.4 °C cooler than in August and 7.6 °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.
The average of the weather stations Pipestone (168 km) and Central City (203 km); nearer ones count more.