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July is the hottest month in Indianapolis IN, with an average high of 85°F / 30°C; January is the coldest (36°F / 2°C). June is the wettest month, averaging 5.0 in / 126 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 36 / 2 | 21 / -6 | 3.1 / 79 | 9 |
| Feb | 41 / 5 | 24 / -4 | 2.4 / 62 | 8 |
| Mar | 52 / 11 | 33 / 1 | 3.7 / 94 | 9 |
| Apr | 64 / 18 | 43 / 6 | 4.3 / 110 | 10 |
| May | 74 / 23 | 54 / 12 | 4.8 / 121 | 11 |
| Jun | 82 / 28 | 63 / 17 | 5.0 / 126 | 10 |
| Jul | 85 / 30 | 66 / 19 | 4.4 / 112 | 8 |
| Aug | 84 / 29 | 65 / 18 | 3.2 / 81 | 7 |
| Sep | 78 / 26 | 57 / 14 | 3.1 / 80 | 6 |
| Oct | 66 / 19 | 46 / 8 | 3.2 / 82 | 7 |
| Nov | 52 / 11 | 35 / 2 | 3.5 / 88 | 8 |
| Dec | 41 / 5 | 26 / -3 | 2.9 / 74 | 9 |
Extremes since 1942: highest 105°F / 41°C (July 6, 2012), lowest -27°F / -33°C (January 19, 1994).
Daylight lasts about 14.8 hours in June and 9.2 hours in December.
Data: Meteostat — Indianapolis International Airport, 1991–2020 averages.
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