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July is the hottest month in Des Moines IA, with an average high of 86°F / 30°C; January is the coldest (31°F / -1°C). June is the wettest month, averaging 5.3 in / 134 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 31 / -1 | 14 / -10 | 1.1 / 27 | 5 |
| Feb | 36 / 2 | 19 / -7 | 1.3 / 34 | 6 |
| Mar | 49 / 10 | 30 / -1 | 2.2 / 55 | 7 |
| Apr | 62 / 17 | 41 / 5 | 4.0 / 102 | 9 |
| May | 73 / 23 | 53 / 11 | 5.2 / 133 | 11 |
| Jun | 82 / 28 | 63 / 17 | 5.3 / 134 | 10 |
| Jul | 86 / 30 | 67 / 19 | 3.8 / 97 | 8 |
| Aug | 84 / 29 | 65 / 18 | 4.2 / 106 | 8 |
| Sep | 77 / 25 | 56 / 13 | 3.2 / 81 | 6 |
| Oct | 64 / 18 | 43 / 6 | 2.8 / 71 | 7 |
| Nov | 49 / 9 | 31 / -1 | 1.9 / 49 | 6 |
| Dec | 36 / 2 | 20 / -7 | 1.6 / 40 | 6 |
Extremes since 1945: highest 108°F / 42°C (August 16, 1983), lowest -26°F / -32°C (February 3, 1996).
Daylight lasts about 15.0 hours in June and 9.0 hours in December.
Data: Meteostat — Des Moines International, 1991–2020 averages.
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