Best time to go to Illinois Average weather of Illinois, United States

When is the best time to go to Illinois?

When is the best time to go to Illinois? Here's some information to help you in your decision:

The best months for good weather in Illinois are May, June, July, August, September and October
On average, the warmest months are June, July, August and September
January is the coldest month of the year
The rainiest months are April, May and June

Annual weather in Illinois

Infographic of the best times to visit Illinois ©whereandwhen.net

Weather details in Illinois month by month

To get all the information about the climate and weather in Illinois for a specific month, click on the corresponding link below:

January February March April May June July August September October November December

Weather and climate in Illinois

Illinois enjoys a hot-summer humid continental climate (without dry season) in accordance with the Köppen-Geiger classification. The yearly average maximum temperature in Illinois is 61°F (ranging from 32°F in january to 83°F in july). Annual rainfall is 42.1in, with a minimum of 2in in january and a maximum of 5.9in in may.

Between the months of january and march the climate is very bad. The record temperature this month is 79°F and it rains about 3.5in each month.
Between the months of april and october the climate is favorable. In average, on the morning it is 50°F and it rains about 14% of the time in october.
Between november and december the climate is very unfavorable. At lunchtime, it's 36°F in average.

Charts: temperature and rainfall in Illinois

In the charts below, you can see the following seasonal norms for the city of Illinois: the minimum and maximum outdoor temperature, the risk and amount of monthly rainfall, daily average sunshine, and relative humidity for each month of the year.

Outside temperature

Precipitation (rainfall)

Daily sunshine hours

Humidity

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