National Weather Service Forecast for: Downers Grove IL
Issued by: National Weather Service Chicago, IL
Updated: 1:55 am CDT Aug 20, 2026
 
Overnight

Overnight: Partly cloudy, with a low around 64. North northeast wind around 5 mph.
Partly Cloudy

 Thursday

Thursday: Sunny, with a high near 80. North northeast wind around 5 mph, with gusts as high as 10 mph.
Sunny

 Thursday
Night
Thursday Night: Partly cloudy, with a low around 61. East northeast wind around 5 mph becoming calm in the evening.
Partly Cloudy

 Friday

Friday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 80. Light south southwest wind becoming southwest 5 to 10 mph in the morning.
Chance
Showers then
Chance
T-storms
 Friday
Night
Friday Night: A 50 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65. Southwest wind around 5 mph, with gusts as high as 10 mph.
Chance
T-storms

 Saturday

Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78.
Sunny then
Slight Chance
T-storms
 Saturday
Night
Saturday Night: Mostly clear, with a low around 62.
Mostly Clear

 Sunday

Sunday: Sunny, with a high near 76.
Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 59.
Partly Cloudy
Lo 64 °F Hi 80 °F Lo 61 °F Hi 80 °F Lo 65 °F Hi 78 °F Lo 62 °F Hi 76 °F Lo 59 °F

Hazardous Weather Outlook
 

Overnight
 
 Partly cloudy, with a low around 64. North northeast wind around 5 mph.
Thursday
 
 Sunny, with a high near 80. North northeast wind around 5 mph, with gusts as high as 10 mph.
Thursday Night
 
 Partly cloudy, with a low around 61. East northeast wind around 5 mph becoming calm in the evening.
Friday
 
 A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 80. Light south southwest wind becoming southwest 5 to 10 mph in the morning.
Friday Night
 
 A 50 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65. Southwest wind around 5 mph, with gusts as high as 10 mph.
Saturday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78.
Saturday Night
 
 Mostly clear, with a low around 62.
Sunday
 
 Sunny, with a high near 76.
Sunday Night
 
 Partly cloudy, with a low around 59.
Monday
 
 Mostly sunny, with a high near 77.
Monday Night
 
 Partly cloudy, with a low around 61.
Tuesday
 
 Mostly sunny, with a high near 79.
Tuesday Night
 
 Partly cloudy, with a low around 65.
Wednesday
 
 A chance of showers. Mostly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Downers Grove IL.