National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

University of Illinois - Willard (KCMI)

Lat: 40.03°NLon: 88.28°WElev: 741ft.

A Few Clouds

60°F

16°C

Humidity 93%
Wind Speed S 15 mph
Barometer 29.84 in (1010.2 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 10 Mar 1:53 am CDT
Extended Forecast for

Monticello IL

  • Overnight

    Overnight: Partly cloudy, with a low around 59. South southwest wind 14 to 16 mph, with gusts as high as 23 mph.

    Low: 59 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 75. Breezy, with a south southwest wind 13 to 20 mph, with gusts as high as 26 mph.

    High: 75 °F

    Partly Sunny
    then Chance
    T-storms and
    Breezy

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 4am. Low around 57. Breezy, with a south wind 18 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 57 °F

    Breezy.
    Chance
    T-storms then
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 1pm, then a chance of showers between 1pm and 4pm. Temperature falling to around 44 by 5pm. Breezy, with a west southwest wind 20 to 24 mph becoming northwest in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 61 °F⇓

    Breezy.
    T-storms then
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 29. Blustery, with a north northwest wind 16 to 21 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 29 mph.

    Low: 29 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Increasing clouds, with a high near 49. Northwest wind 6 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.

    High: 49 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 41. Breezy, with a south wind 13 to 18 mph increasing to 23 to 28 mph after midnight. Winds could gust as high as 38 mph.

    Low: 41 °F

    Mostly Cloudy
    and Breezy

  • Friday

    Friday: Mostly cloudy, with a high near 55. Breezy.

    High: 55 °F

    Mostly Cloudy
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 59. South southwest wind 14 to 16 mph, with gusts as high as 23 mph.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 75. Breezy, with a south southwest wind 13 to 20 mph, with gusts as high as 26 mph.
Tuesday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 4am. Low around 57. Breezy, with a south wind 18 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Showers and possibly a thunderstorm before 1pm, then a chance of showers between 1pm and 4pm. Temperature falling to around 44 by 5pm. Breezy, with a west southwest wind 20 to 24 mph becoming northwest in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 29. Blustery, with a north northwest wind 16 to 21 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 29 mph.
Thursday
Increasing clouds, with a high near 49. Northwest wind 6 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 41. Breezy, with a south wind 13 to 18 mph increasing to 23 to 28 mph after midnight. Winds could gust as high as 38 mph.
Friday
Mostly cloudy, with a high near 55. Breezy.
Friday Night
Mostly cloudy, with a low around 33.
Saturday
Mostly cloudy, with a high near 59. Breezy.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 44. Breezy.
Sunday
Rain. Cloudy, with a high near 56. Breezy.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 19. Blustery.
Monday
Partly sunny, with a high near 31. Blustery.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Monticello IL
 40.05°N 88.55°W (Elev. 650 ft)
Last Update:
1:26 am CDT Mar 10, 2026
Forecast Valid:
2am CDT Mar 10, 2026-6pm CDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation