NWS Forecast for Downers Grove IL

National Weather Service Forecast for: Downers Grove IL
Issued by: National Weather Service Chicago, IL

Updated: 4:11 am CDT Aug 7, 2025

Today Mostly Sunny then Slight Chance T-storms	Tonight Chance T-storms	Friday Slight Chance T-storms	Friday Night Mostly Clear	Saturday Sunny	Saturday Night Partly Cloudy then Slight Chance T-storms	Sunday Chance Showers then Chance T-storms	Sunday Night Chance T-storms	Monday Chance Showers then Chance T-storms
Hi 90 °F	Lo 72 °F	Hi 91 °F	Lo 75 °F	Hi 93 °F	Lo 75 °F	Hi 90 °F	Lo 72 °F	Hi 87 °F

Air Quality Alert
Hazardous Weather Outlook

Today	A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. South southwest wind 5 to 10 mph.
Tonight	A 40 percent chance of showers and thunderstorms, mainly after 9pm. Mostly cloudy, with a low around 72. South wind 5 to 10 mph.
Friday	A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 91. Heat index values as high as 98. South wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night	Mostly clear, with a low around 75. South wind around 10 mph, with gusts as high as 20 mph.
Saturday	Sunny, with a high near 93. South wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday Night	A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75.
Sunday	A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
Sunday Night	A chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Monday	A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 87.
Monday Night	A chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Tuesday	A chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Tuesday Night	Partly cloudy, with a low around 68.
Wednesday	Mostly sunny, with a high near 86.

Forecast from NOAA-NWS for Downers Grove IL.