Weather in Chicago
Live weather and 7-day forecast for Chicago, United States, followed by what to expect in each month of the year.
Sunrise 07:11 Sunset 18:00 Daylight 10h 48m Sun times →
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7-day forecast
Forecast data from Open-Meteo
Climate in Chicago: month by month
Averaged over 2023–2025, the warmest month in Chicago is July, with highs around 28 °C (82 °F) and lows around 20 °C (67 °F); the coolest is January, with highs around 1 °C (33 °F) and lows around -6 °C (21 °F). Average lows fall below freezing in December–February.
Chicago gets about 1,036 mm (41 in) of precipitation a year. The wettest month is July (194 mm over about 13 days) and the driest is February (44 mm).
| Month | Avg high | Avg low | Precipitation (in) | Wet days | Daylight |
|---|---|---|---|---|---|
| January | 33° | 21° | 3.1 | 11 | 9h 28m |
| February | 41° | 25° | 1.7 | 6 | 10h 37m |
| March | 50° | 34° | 3.7 | 10 | 11h 54m |
| April | 60° | 42° | 3.5 | 13 | 13h 20m |
| May | 68° | 51° | 2.8 | 10 | 14h 33m |
| June | 81° | 63° | 3.4 | 9 | 15h 12m |
| July | 82° | 67° | 7.6 | 13 | 14h 56m |
| August | 80° | 66° | 3.0 | 8 | 13h 53m |
| September | 76° | 61° | 3.6 | 8 | 12h 30m |
| October | 65° | 51° | 3.1 | 10 | 11h 7m |
| November | 50° | 38° | 2.7 | 8 | 9h 50m |
| December | 39° | 27° | 2.7 | 11 | 9h 9m |
Averages of daily values from the ERA5 reanalysis for 2023–2025 at Chicago's coordinates (model elevation 241 m), via Open-Meteo (CC BY 4.0). Three recent years are not a 30-year climate normal; reanalysis smooths local extremes and tends to count more light-rain days than a rain gauge would. Daylight is sunrise to sunset on the 15th of each month.
Weather questions for Chicago
What is the hottest month in Chicago?
July, with average highs of 28 °C (82 °F) and lows of 20 °C (67 °F) over 2023–2025. The coolest month is January, averaging 1 °C (33 °F) by day and -6 °C (21 °F) at night.
What is the rainiest month in Chicago?
July, with about 194 mm of precipitation on roughly 13 days. The driest month is February (44 mm), and the yearly total is around 1,036 mm.
When is the weather mildest in Chicago?
Going by the averages, May–June and August–October are the months with average daytime highs between 18 °C and 27 °C (64–81 °F) — warm but not hot. July is the month most likely to bring rain.
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About this forecast
The live forecast comes from Open-Meteo, which blends models from national weather services and is fetched fresh in your browser on each visit. Times in the hourly outlook are Chicago local time (America/Chicago).