National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 11:41 pm CST Dec 17, 2025
 
Overnight

Overnight: A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a temperature rising to around 43 by 5am. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.
Chance
Showers and
Breezy
 Thursday

Thursday: Rain showers before 5pm, then a slight chance of freezing rain. Temperature rising to near 48 by 10am, then falling to around 32 during the remainder of the day. Breezy, with a south wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 100%. Little or no ice accumulation expected.
Breezy.
Showers then
Rain/Freezing
Rain Likely
 Thursday
Night
Thursday Night: Scattered snow showers, mainly before 9pm. Mostly cloudy, with a low around 11. Wind chill values as low as -6. Breezy, with a west wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 40%.
Scattered
Snow Showers
and Breezy
 Friday

Friday: Mostly sunny, with a high near 27. Wind chill values as low as -6. Blustery, with a west northwest wind 15 to 20 mph becoming south southwest 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.
Mostly Sunny
and Blustery
then Mostly
Sunny
 Friday
Night
Friday Night: Mostly cloudy, with a low around 21. South wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Cloudy

 Saturday

Saturday: Mostly cloudy, with a high near 42.
Mostly Cloudy

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 17.
Partly Cloudy

 Sunday

Sunday: Sunny, with a high near 30.
Sunny

 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 20.
Mostly Cloudy
Lo 37 °F⇑ Hi 48 °F⇓ Lo 11 °F Hi 27 °F Lo 21 °F Hi 42 °F Lo 17 °F Hi 30 °F Lo 20 °F

 

Overnight
 
 A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a temperature rising to around 43 by 5am. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.
Thursday
 
 Rain showers before 5pm, then a slight chance of freezing rain. Temperature rising to near 48 by 10am, then falling to around 32 during the remainder of the day. Breezy, with a south wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 100%. Little or no ice accumulation expected.
Thursday Night
 
 Scattered snow showers, mainly before 9pm. Mostly cloudy, with a low around 11. Wind chill values as low as -6. Breezy, with a west wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 40%.
Friday
 
 Mostly sunny, with a high near 27. Wind chill values as low as -6. Blustery, with a west northwest wind 15 to 20 mph becoming south southwest 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
 
 Mostly cloudy, with a low around 21. South wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday
 
 Mostly cloudy, with a high near 42.
Saturday Night
 
 Partly cloudy, with a low around 17.
Sunday
 
 Sunny, with a high near 30.
Sunday Night
 
 Mostly cloudy, with a low around 20.
Monday
 
 Mostly cloudy, with a high near 38.
Monday Night
 
 Mostly cloudy, with a low around 33.
Tuesday
 
 Partly sunny, with a high near 45.
Tuesday Night
 
 Mostly cloudy, with a low around 29.
Wednesday
 
 Partly sunny, with a high near 40.

 

Forecast from NOAA-NWS for Mount Prospect IL.