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

Thunderstorms and Widespread Rainfall Across the Southern Plains

Isolated severe thunderstorms and widespread showers may produce flash flooding across the Southern Plains through Thursday. Numerous instances of flash flooding are expected in south-central Texas, including portions of the Hill Country; and an additional area across eastern Oklahoma into the Ozarks on Thursday. Heavy rainfall and mountain snow will return to southern California on Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

University of Illinois - Willard (KCMI)

Lat: 40.03°NLon: 88.28°WElev: 741ft.

Fog

44°F

7°C

Humidity 100%
Wind Speed Calm
Barometer 30.13 in (1020.6 mb)
Dewpoint 44°F (7°C)
Visibility 0.50 mi
Last update 20 Nov 4:53 am CST
Extended Forecast for

Monticello IL

  • Overnight

    Overnight: A 20 percent chance of rain. Patchy fog. Otherwise, cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Slight Chance
    Rain and
    Patchy Fog

  • Thursday

    Thursday: A 20 percent chance of rain before 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 52. South wind 7 to 9 mph.

    High: 52 °F

    Slight Chance
    Rain and
    Patchy Fog
    then Cloudy

  • Thursday Night

    Thursday Night: A 50 percent chance of rain. Cloudy, with a low around 47. Southeast wind 3 to 8 mph.

    Low: 47 °F

    Chance Rain

  • Friday

    Friday: Rain likely. Cloudy, with a high near 56. Northeast wind 5 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 56 °F

    Rain Likely

  • Friday Night

    Friday Night: A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 37. North northeast wind 8 to 10 mph.

    Low: 37 °F

    Chance Rain
    then Mostly
    Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 53. North northeast wind 5 to 8 mph becoming east southeast in the afternoon.

    High: 53 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 34. South southeast wind around 6 mph becoming west southwest after midnight.

    Low: 34 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of rain. Patchy fog. Otherwise, cloudy, with a low around 43. Calm wind.
Thursday
A 20 percent chance of rain before 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 52. South wind 7 to 9 mph.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 47. Southeast wind 3 to 8 mph.
Friday
Rain likely. Cloudy, with a high near 56. Northeast wind 5 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Friday Night
A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 37. North northeast wind 8 to 10 mph.
Saturday
Mostly sunny, with a high near 53. North northeast wind 5 to 8 mph becoming east southeast in the afternoon.
Saturday Night
Mostly clear, with a low around 34. South southeast wind around 6 mph becoming west southwest after midnight.
Sunday
Sunny, with a high near 59.
Sunday Night
Mostly cloudy, with a low around 37.
Monday
A 40 percent chance of rain after noon. Mostly cloudy, with a high near 56.
Monday Night
Rain likely. Cloudy, with a low around 44.
Tuesday
A chance of rain. Mostly cloudy, with a high near 57.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Monticello IL
 40.03°N 88.58°W (Elev. 650 ft)
Last Update:
3:21 am CST Nov 20, 2025
Forecast Valid:
5am CST Nov 20, 2025-6pm CST Nov 26, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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