How reliable is this forecast?

Values for 5 days ahead show a trend; they are updated as the date approaches and may change.

Weather · United States

Illinois 5-Day Weather Forecast

Over the 5 days from October 17 to October 21, temperatures in Illinois will range from 3°C to 22°C; the warmest day is October 21. No significant rain is expected during this period.

Illinois 5-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 5 days?: Over the 5 days from October 17 to October 21, temperatures in Illinois will range from 3°C to 22°C; the warmest day is October 21. No significant rain is expected during this period.
How reliable is this forecast?: Values for 5 days ahead show a trend; they are updated as the date approaches and may change.