Chicago climate by month
In Chicago, the warmest month is August, with average highs of 78 °F, and the coldest is February, with average lows of 23 °F. About 38.7 in of rain falls each year over 123 days; May is the wettest month (4.5 in) and January the driest (1.9 in).
Best time to visit Chicago: for mild, mostly dry days, aim for June, July, August, September.
| Month | Avg high | Avg low | Rain | Rainy days |
|---|---|---|---|---|
| January | 32 °F | 24 °F | 1.9 in | 8 |
| February | 34 °F | 23 °F | 2.2 in | 8 |
| March | 42 °F | 31 °F | 2.9 in | 10 |
| April | 50 °F | 39 °F | 3.6 in | 12 |
| May | 60 °F | 49 °F | 4.5 in | 14 |
| June | 71 °F | 60 °F | 4.2 in | 12 |
| July | 77 °F | 68 °F | 4.3 in | 12 |
| August | 78 °F | 69 °F | 3.4 in | 12 |
| September | 73 °F | 63 °F | 3.3 in | 10 |
| October | 61 °F | 51 °F | 4.3 in | 11 |
| November | 48 °F | 39 °F | 2.1 in | 7 |
| December | 39 °F | 31 °F | 2.2 in | 8 |
2015–2024 averages computed from NASA POWER data (about 50 km grid: values may differ slightly from a city weather station, especially on the coast or in the mountains).
Frequently asked questions
What is the 15-day weather forecast for Chicago?
The first 10 days come from the forecast model of the Norwegian Meteorological Institute (MET Norway), updated several times a day. After that, we show the outlook: the normal temperatures in Chicago for the time of year and the chance of rain, based on the last 10 years.
Is there a 30-day forecast for Chicago?
No model can reliably forecast the weather on a specific day 30 days ahead. The outlook shows what is typical in Chicago at that time of year: a good basis for planning a trip, to be checked against the 10-day forecast as the date gets closer.
What is the hottest month in Chicago?
August, with average highs of 78 °F. The coldest month is February, with average lows of 23 °F.
What is the rainiest month in Chicago?
May. The driest month is January. On average it rains on 123 days a year in Chicago, for about 38.7 in of precipitation.
How can I check past weather in Chicago?
Pick a date in the "Past weather" section to see the high and low temperatures and the rain recorded that day, how it compared with normal, and the same day in previous years.
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