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

78°F

26°C

Humidity 54%
Wind Speed E 12 G 18 mph
Barometer 30.15 in (1020.6 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 7 Sep 11:53 am CDT
Extended Forecast for

Monticello IL

  • Labor Day

    Labor Day: Sunny, with a high near 83. East wind around 9 mph.

    High: 83 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. East wind 6 to 8 mph.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 90. East southeast wind 5 to 8 mph becoming south in the afternoon.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71. South wind 7 to 14 mph, with gusts as high as 18 mph.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 92. South southwest wind 11 to 15 mph becoming west in the afternoon. Winds could gust as high as 21 mph.

    High: 92 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers likely, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 66. West wind 5 to 9 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    Showers
    Likely

  • Thursday

    Thursday: Mostly sunny, with a high near 82. North northwest wind 6 to 9 mph.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

Labor Day
Sunny, with a high near 83. East wind around 9 mph.
Tonight
Mostly clear, with a low around 60. East wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 90. East southeast wind 5 to 8 mph becoming south in the afternoon.
Tuesday Night
Partly cloudy, with a low around 71. South wind 7 to 14 mph, with gusts as high as 18 mph.
Wednesday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 92. South southwest wind 11 to 15 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Wednesday Night
Showers likely, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 66. West wind 5 to 9 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Mostly sunny, with a high near 82. North northwest wind 6 to 9 mph.
Thursday Night
Mostly clear, with a low around 57.
Friday
Sunny, with a high near 84.
Friday Night
A 30 percent chance of showers after 1am. Mostly clear, with a low around 62.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
A chance of showers. Mostly clear, with a low around 64.
Sunday
Sunny, with a high near 87.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Monticello IL
 40.03°N 88.58°W (Elev. 650 ft)
Last Update:
12:36 pm CDT Sep 7, 2026
Forecast Valid:
12pm CDT Sep 7, 2026-6pm CDT Sep 13, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation