The weather in Illinois in July is hot. The average temperatures are between 20°C and 27°C.
You can expect about 3 to 8 days of rain in Illinois during the month of July. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Illinois in July 2025.
If you’re planning to visit Illinois in the near future, we highly recommend that you review the 14 day weather forecast for Illinois before you arrive.
Temperatures
27° / 20°
Rainy Days
7
Snowy Days
0
Dry Days
24
Rainfall
114
mm
Sun Hours
11.0
Hrs
