National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 6:41 pm CDT Jun 22, 2025
 
Tonight

Tonight: Clear, with a low around 81. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Clear and
Breezy then
Clear
 Monday

Monday: Sunny and hot, with a high near 97. Heat index values as high as 101. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph.
Hot and
Breezy

 Monday
Night
Monday Night: A slight chance of showers and thunderstorms between 10pm and 4am. Partly cloudy, with a low around 74. Breezy, with a southwest wind 15 to 20 mph becoming west southwest 5 to 10 mph in the evening. Winds could gust as high as 35 mph. Chance of precipitation is 20%.
Slight Chance
T-storms and
Breezy
 Tuesday

Tuesday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 90. Heat index values as high as 96. West southwest wind 5 to 10 mph becoming north in the afternoon. Chance of precipitation is 60%.
Slight Chance
T-storms then
T-storms
Likely
 Tuesday
Night
Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Northeast wind around 5 mph, with gusts as high as 10 mph.
Chance
T-storms

 Wednesday

Wednesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Chance
T-storms

 Wednesday
Night
Wednesday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Chance
T-storms

 Thursday

Thursday: A chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Chance
T-storms

 Thursday
Night
Thursday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Chance
T-storms
Lo 81 °F Hi 97 °F Lo 74 °F Hi 90 °F Lo 67 °F Hi 87 °F Lo 71 °F Hi 92 °F Lo 71 °F

Extreme Heat Warning
Hazardous Weather Outlook
 

Tonight
 
 Clear, with a low around 81. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
 
 Sunny and hot, with a high near 97. Heat index values as high as 101. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph.
Monday Night
 
 A slight chance of showers and thunderstorms between 10pm and 4am. Partly cloudy, with a low around 74. Breezy, with a southwest wind 15 to 20 mph becoming west southwest 5 to 10 mph in the evening. Winds could gust as high as 35 mph. Chance of precipitation is 20%.
Tuesday
 
 Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 90. Heat index values as high as 96. West southwest wind 5 to 10 mph becoming north in the afternoon. Chance of precipitation is 60%.
Tuesday Night
 
 A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Northeast wind around 5 mph, with gusts as high as 10 mph.
Wednesday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Thursday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Thursday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Friday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 87.
Friday Night
 
 Partly cloudy, with a low around 68.
Saturday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Saturday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Sunday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 90.

 

Forecast from NOAA-NWS for Mount Prospect IL.