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Get the Chicago IL weather forecast without ads, cookies, or tracking. Open-Meteo data, 10-day forecast, hourly conditions, and radar — all free. click here to hide this
July is the hottest month in Chicago IL, with an average high of 85°F / 29°C; January is the coldest (32°F / 0°C). May is the wettest month, averaging 4.8 in / 121 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 32 / 0 | 19 / -7 | 2.3 / 58 | 8 |
| Feb | 37 / 3 | 22 / -5 | 2.1 / 54 | 7 |
| Mar | 47 / 9 | 31 / 0 | 2.6 / 67 | 8 |
| Apr | 60 / 15 | 41 / 5 | 4.1 / 105 | 10 |
| May | 71 / 22 | 52 / 11 | 4.8 / 121 | 10 |
| Jun | 81 / 27 | 62 / 17 | 4.5 / 115 | 10 |
| Jul | 85 / 29 | 68 / 20 | 4.0 / 102 | 8 |
| Aug | 83 / 28 | 66 / 19 | 4.1 / 104 | 8 |
| Sep | 76 / 25 | 59 / 15 | 3.3 / 85 | 7 |
| Oct | 63 / 17 | 46 / 8 | 3.9 / 98 | 9 |
| Nov | 49 / 10 | 35 / 2 | 2.7 / 69 | 8 |
| Dec | 37 / 3 | 25 / -4 | 2.3 / 59 | 8 |
Extremes since 1928: highest 107°F / 42°C (June 1, 1934), lowest -25°F / -32°C (January 20, 1985).
Daylight lasts about 15.0 hours in June and 9.0 hours in December.
Data: Meteostat — Chicago Midway Airport, 1991–2020 averages.
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