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Chicago (IL) Climate by Month

The graphs below provide an overview of the climate in Chicago (Illinois), the United States of America. They present long-term patterns and averages of weather conditions over a 30-year period.

Average day and night temperature

The mean minimum and maximum temperatures over the year.

Monthly precipitation

The mean monthly precipitation over the year, including rain, snow, hail etc.

Forecast for Chicago (IL)

Sat   Jul 13
33°C | 20°C
SW 18 km/h
2.9 mm
partly cloudy and  chance of rain

partly cloudy and chance of rain

Sun   Jul 14
33°C | 24°C
SW 22 km/h
19 mm
partly cloudy and thunder

partly cloudy and thunder

Mon   Jul 15
34°C | 24°C
SW 25 km/h
22 mm
broken clouds and small chance of rain

broken clouds and small chance of rain

The best time of year to visit Chicago in the United States of America

Chicago features a typical hot-summer humid continental climate, and experiences four distinct seasons. Winter in Chicago is very variable. The average winter produces 940 mm of snow. This is just an average, because most winters produce only a few snow falls during the season. Temperatures can vary wildly within the span of one week, but temperatures can often stay below freezing for several continues days or even weeks in January and February. The temperature in January averages about -2°C in the afternoon, and -10°C at night.

On a typical summer day, humidity is usually high and temperatures ordinarily reach anywhere between 26°C and 33°C. Overnight temperatures in summer usually drop to around 18°C. Thunderstorms occur during summer.

The best time to visit Chicago is May through September. Where the residents of Chicago prefer to stay indoors between November and March, they open the doors and celebrate starting April. This period the city comes alive since the sun increases in strength and occasionally rises above the skyscrapers. It can be a bit busy during this period so it is recommended to book a place to stay in advance.

During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:

  • When is summer in Chicago?
    The hottest season / summer takes place in June, July, August and September.
  • When is winter in Chicago?
    The coldest season / winter is in the following months: January, February and December.
  • Which is the warmest month in Chicago?
    July has an average maximum temperature of 29°C and is the warmest month of the year.
  • Which is the coldest month in Chicago?
    The coldest month is January with an average maximum temperature of -1°C.
  • Which is the wettest month in Chicago?
    June tops the wettest month list with 126 mm of rainfall.
  • Which is the driest month in Chicago?
    January is the driest month with 50 mm of precipitation.
  • Which is the sunniest month in Chicago?
    July is the sunniest month with an average of 319 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.