Illinois weather averages for holidays in 2017/2018

Check Illinois weather averages before you book your next holiday in 2017/2018. Today's maximum temperature in Illinois is expected to be 31°C, while the average maximum temperature in September is 24°C. The holiday weather guide shown below is for Chicago.

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Illinois weather averages

Check Illinois weather averages before you book your next holiday. The warmest month in Illinois is July with an average maximum temperature of 29°C. The sunniest months are June and July with on average 10 hours of bright sunshine per day. The months with the least number of days with some rain are August, September and October with 9 days. The sea is at its warmest in Illinois in August with an average sea temperature of 21°C. The Illinois weather averages shown below are for Chicago.

Maximum daytime temperature (°C)

Hours of sunshine (daily)

Days with some rainfall

Sea temperature (°C)

More weather parameters

Metric (°C / mm)  |  Imperial (°F / inches)

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Illinois weather today

Here is the weather in Illinois today, Sunday 24th September 2017. Expect clear skies in Illinois with a maximum temperature of 31°C and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-east. The weather forecast shown below is for Chicago.

  • 31
    °C maximum temperature
  • clear skies
  • 10
    hours of sunshine
  • 0
    mm of rainfall expected
  • 13
    kph wind from SE

5-day weather forecast

Metric (°C / mm)  |  Imperial (°F / inches)

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Tropical storm risk: Illinois hurricane season

% of month affected by tropical storms
0
0
0
0
0
<1%
<1%
0
<1%
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0
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Jun
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Dec

The Illinois tropical storm risk chart above shows the hurricane season for Chicago, Illinois.

More about tropical storms

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Illinois holiday weather averages by month

Check Illinois holiday weather averages for a particular month by selecting from the list below. Monthly weather guides include figures for temperature, rainfall, sunshine hours and sea temperature plus daily sunrise & sunset times.

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Compare Illinois weather with the USA

Below the Illinois weather chart shows maximum daytime temperature for Illinois, USA (Chicago) and the USA (Washington). For more weather parameters or to change the destinations shown visit the comparison weather tool.

Maximum daytime temperature (°C)

Illinois, USA (Chicago)
USA (Washington)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C / mm)  |  Imperial (°F / inches)

Compare more Illinois weather >>

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More Illinois destinations

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Can't see your chosen destination? Use our A to Z search to find your required the holiday weather guide:

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