The weather in Illinois for the next 30 days
This chart shows the temperature in Illinois for the next 30 days, displayed in degrees Celsius. The long-term weather forecast is based on the 14-day weather forecast and the average historical weather data for Illinois from the past 10 years. We factor in the changing climate, so you know what to typically expect during this period.
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Precipitation in Illinois for the next 30 days
This chart shows the precipitation in Illinois for the next 30 days, measured in millimeters. We also base this on the current 14-day weather forecast, followed by the average daily precipitation over the past 10 years.
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4 4 4 5 4 4 4 4 4 4 4 4 4 4 4 4Average Weather in Illinois by Month
Click on a month below to see detailed weather info for Illinois. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
