South Dakota climate
World Climates covers 1 place in South Dakota. Sioux Falls has a hot-summer humid continental climate (Köppen Dfa).
Climate of Sioux Falls at a glance
The year average in Sioux Falls is 9 °C47 °F. The warmest month is July, with an average high of 31 °C87 °F. The coldest is January, with an average low of −12 °C10 °F. About 669 mm26 in of precipitation falls in a year. June is the wettest month and January the driest. By our comfort score, the best months to visit are May and August and September.
Frequently asked questions
How many places in South Dakota does this site cover?
World Climates has climate data for one place in South Dakota: Sioux Falls. Its page has monthly averages for temperature, rainfall, humidity and daylight.
What is the warmest month in Sioux Falls?
July is the warmest month, with an average high of 31 °C87 °F. January is the coldest, with an average low of −12 °C10 °F.
When does it rain the most in Sioux Falls?
June is the wettest month, with about 106 mm4.2 in of precipitation. The yearly total is about 669 mm26 in.
When is the best time to visit Sioux Falls?
By our comfort score, the most comfortable months are May and August and September. The score is based on long-term averages, not on a forecast.
Climate of every place in South Dakota
| Place | Year | Max high | Min low | Precip. |
|---|---|---|---|---|
| Sioux Falls | 9 | 31 | −12 | 669 |
Year = annual mean temperature; max high = average high of the warmest month; min low = average low of the coldest month; precip. = annual total. Temperatures in °C°F, precipitation in mminches. Sorted by population.
Data: NASA POWER climatology 2001–2025 (MERRA-2 reanalysis, CERES satellite data) — grid-cell averages, not station records. Sources and method.