How reliable is this forecast?

Values for 7 days ahead show a trend; they are updated as the date approaches and may change.

Weather · United States

Illinois 7-Day Weather Forecast

Over the 7 days from October 17 to October 23, temperatures in Illinois will range from 3°C to 25°C; the warmest day is October 23. No significant rain is expected during this period.

Illinois 7-day forecast table

The bar shows each day's range against the period's lowest and highest temperature.

Frequently asked questions

What will the weather be like in Illinois over the next 7 days?: Over the 7 days from October 17 to October 23, temperatures in Illinois will range from 3°C to 25°C; the warmest day is October 23. No significant rain is expected during this period.
How reliable is this forecast?: Values for 7 days ahead show a trend; they are updated as the date approaches and may change.