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

Hazardous Weather Conditions

Current conditions at

University of Illinois - Willard (KCMI)

Lat: 40.03°NLon: 88.28°WElev: 741ft.

Fair

88°F

31°C

Humidity 73%
Wind Speed Vrbl 6 mph
Barometer 30.12 in (1019.4 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index102°F (39°C)
Last update 2 Jul 10:53 am CDT
Extended Forecast for

Monticello IL

Extreme Heat Warning July 2, 11:53am until July 3, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 2, 11:53am until July 3, 07:00pm

    NOW until 7:00pm Fri

    Extreme Heat Warning

  • Today

    High: 92 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 74. South wind 6 to 8 mph.

    Low: 74 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms before noon, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Heat index values as high as 105. Southwest wind 7 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 20%.

    High: 92 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly between 11pm and 2am. Partly cloudy, with a low around 72. South wind 5 to 7 mph.

    Low: 72 °F

    Chance
    T-storms

  • Independence Day

    Independence Day: Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 89. South southwest wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Mostly Sunny
    then Showers
    Likely

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southwest wind around 6 mph becoming south southeast in the evening.

    Low: 70 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. West wind 6 to 8 mph.

    High: 87 °F

    Partly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 92. Heat index values as high as 109. South southwest wind 8 to 11 mph, with gusts as high as 17 mph.
Tonight
Partly cloudy, with a low around 74. South wind 6 to 8 mph.
Friday
A slight chance of showers and thunderstorms before noon, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Heat index values as high as 105. Southwest wind 7 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 20%.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly between 11pm and 2am. Partly cloudy, with a low around 72. South wind 5 to 7 mph.
Independence Day
Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 89. South southwest wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southwest wind around 6 mph becoming south southeast in the evening.
Sunday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. West wind 6 to 8 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66.
Monday
Mostly sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 66.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
A chance of showers. Mostly sunny, with a high near 86.
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:
11:36 am CDT Jul 2, 2026
Forecast Valid:
11am CDT Jul 2, 2026-6pm CDT Jul 8, 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