National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 4:11 am CST Dec 5, 2025
 
Today

Today: Partly sunny, with a high near 26. Wind chill values as low as -5. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Partly Sunny

 Tonight

Tonight: Patchy snow and freezing rain between 9pm and 3am. Mostly cloudy, with a low around 24. South southwest wind 10 to 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 30%.
Patchy Wintry
Mix
 Saturday

Saturday: Partly sunny, with a temperature falling to around 22 by 5pm. West northwest wind 5 to 10 mph becoming light north northwest in the afternoon.
Partly Sunny

 Saturday
Night
Saturday Night: Snow likely, mainly after midnight. Mostly cloudy, with a low around 18. Calm wind becoming north northwest around 5 mph after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 70%. New snow accumulation of around an inch possible.
Slight Chance
Snow then
Snow Likely
 Sunday

Sunday: Snow likely before noon. Partly sunny, with a high near 27. North northwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Snow Likely
then Partly
Sunny
 Sunday
Night
Sunday Night: A 20 percent chance of snow showers. Mostly cloudy, with a low around 10.
Slight Chance
Snow Showers
 Monday

Monday: Partly sunny, with a high near 23.
Partly Sunny

 Monday
Night
Monday Night: A chance of snow. Mostly cloudy, with a low around 15.
Chance Snow

 Tuesday

Tuesday: Mostly cloudy, with a high near 35.
Mostly Cloudy
Hi 26 °F Lo 24 °F Hi 26 °F⇓ Lo 18 °F Hi 27 °F Lo 10 °F Hi 23 °F Lo 15 °F Hi 35 °F

Hazardous Weather Outlook
Hydrologic Outlook
 

Today
 
 Partly sunny, with a high near 26. Wind chill values as low as -5. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
 
 Patchy snow and freezing rain between 9pm and 3am. Mostly cloudy, with a low around 24. South southwest wind 10 to 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 30%.
Saturday
 
 Partly sunny, with a temperature falling to around 22 by 5pm. West northwest wind 5 to 10 mph becoming light north northwest in the afternoon.
Saturday Night
 
 Snow likely, mainly after midnight. Mostly cloudy, with a low around 18. Calm wind becoming north northwest around 5 mph after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 70%. New snow accumulation of around an inch possible.
Sunday
 
 Snow likely before noon. Partly sunny, with a high near 27. North northwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Sunday Night
 
 A 20 percent chance of snow showers. Mostly cloudy, with a low around 10.
Monday
 
 Partly sunny, with a high near 23.
Monday Night
 
 A chance of snow. Mostly cloudy, with a low around 15.
Tuesday
 
 Mostly cloudy, with a high near 35.
Tuesday Night
 
 Rain and snow likely before midnight, then rain. Cloudy, with a low around 29.
Wednesday
 
 A chance of rain and snow. Cloudy, with a high near 36.
Wednesday Night
 
 A chance of snow. Mostly cloudy, with a low around 14.
Thursday
 
 A chance of snow. Partly sunny, with a high near 23.

 

Forecast from NOAA-NWS for Mount Prospect IL.