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July is the hottest month in Sioux Falls SD, with an average high of 84°F / 29°C; January is the coldest (26°F / -3°C). June is the wettest month, averaging 4.2 in / 107 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 26 / -3 | 8 / -13 | 0.6 / 15 | 3 |
| Feb | 31 / -1 | 12 / -11 | 0.8 / 21 | 4 |
| Mar | 44 / 7 | 24 / -5 | 1.6 / 41 | 6 |
| Apr | 58 / 14 | 35 / 1 | 3.0 / 76 | 8 |
| May | 70 / 21 | 47 / 8 | 3.9 / 98 | 10 |
| Jun | 80 / 27 | 58 / 14 | 4.2 / 107 | 9 |
| Jul | 84 / 29 | 63 / 17 | 3.3 / 83 | 7 |
| Aug | 82 / 28 | 60 / 16 | 3.3 / 85 | 7 |
| Sep | 75 / 24 | 51 / 11 | 2.7 / 69 | 6 |
| Oct | 60 / 16 | 37 / 3 | 2.4 / 60 | 6 |
| Nov | 44 / 7 | 24 / -5 | 1.2 / 31 | 4 |
| Dec | 31 / -1 | 13 / -11 | 0.8 / 21 | 4 |
Extremes since 1932: highest 110°F / 43°C (July 17, 1936), lowest -36°F / -38°C (January 19, 1970).
Daylight lasts about 15.2 hours in June and 8.8 hours in December.
Data: Meteostat — Sioux Falls Foss Field, 1991–2020 averages.
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