Illinois climate guide

Temperature in Illinois (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
Min temperature (night-time)
Sea temperature

Sunshine & Daylight in Illinois

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight

Rainfall in Illinois

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
Average monthly rainfall (mm)

More climate for Illinois

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
Heat & Humidity

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

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

The climate guide shown above is for Chicago.

More about Illinois

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All months

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  • Book low fares on flights to Chicago with Virgin Atlantic
  • Flights depart from London Heathrow Airport
  • Join Flying Club & earn miles with every booking

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Illinois climate by month

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

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More Illinois destinations

All destinations (A to Z)

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

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