Weatheo

Sioux Falls Weather by Month

Average temperatures, rainfall and humidity for Sioux Falls, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Sioux Falls month looks like before you travel — then check the live Sioux Falls forecast for the days ahead.

Warmest month

July

29°C average high

Coolest month

January

-12°C average low

Wettest month

June

63 mm of rain

Driest month

February

3 mm of rain

Average temperature and rainfall in Sioux Falls by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January-2°C-12°C-33°C / 14°C
5 mm
78%15 km/h
February0°C-11°C-31°C / 20°C
3 mm
74%16 km/h
March8°C-3°C-28°C / 32°C
18 mm
71%18 km/h
April15°C2°C-16°C / 33°C
36 mm
64%20 km/h
May22°C10°C-3°C / 35°C
61 mm
64%16 km/h
June28°C16°C6°C / 37°C
63 mm
66%15 km/h
July29°C18°C8°C / 38°C
39 mm
72%13 km/h
August28°C17°C7°C / 40°C
48 mm
75%13 km/h
September25°C13°C2°C / 38°C
35 mm
71%14 km/h
October16°C5°C-12°C / 33°C
36 mm
68%16 km/h
November7°C-3°C-22°C / 26°C
25 mm
73%15 km/h
December0°C-9°C-34°C / 16°C
18 mm
79%15 km/h

Best time to visit Sioux Falls

The most comfortable time to visit Sioux Falls is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 387 mm a year.

Travellers who prefer heat should aim for July, when highs average 29°C. June is the month to avoid if rain would spoil your plans — it averages 63 mm, roughly 22× the rainfall of the driest month (February).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Sioux Falls forecast for what is happening now.

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