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

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

10°F

-12°C

Humidity 80%
Wind Speed N 6 mph
Barometer 30.26 in (1026.3 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill0°F (-18°C)
Last update 4 Dec 6:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Patchy freezing fog after 9pm. Partly cloudy, with a low around 3. Wind chill values between -4 and 1. Northeast wind around 5 mph becoming calm in the evening.

    Low: 3 °F

    Patchy
    Freezing Fog

  • Friday

    Friday: Patchy freezing fog before 9am. Sunny, with a high near 30. Wind chill values between 1 and 11. South wind 3 to 8 mph. Winds could gust as high as 15 mph.

    High: 30 °F

    Patchy
    Freezing Fog
    then Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 22. South wind around 7 mph becoming west after midnight.

    Low: 22 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, with a high near 30. West wind around 6 mph becoming calm in the morning.

    High: 30 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 21. Calm wind becoming east around 6 mph after midnight.

    Low: 21 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A 40 percent chance of snow before noon. Mostly cloudy, with a high near 30. East wind 6 to 10 mph becoming north in the afternoon. Winds could gust as high as 15 mph.

    High: 30 °F

    Chance Snow
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 8. North wind 5 to 9 mph.

    Low: 8 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 25.

    High: 25 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Patchy freezing fog after 9pm. Partly cloudy, with a low around 3. Wind chill values between -4 and 1. Northeast wind around 5 mph becoming calm in the evening.
Friday
Patchy freezing fog before 9am. Sunny, with a high near 30. Wind chill values between 1 and 11. South wind 3 to 8 mph. Winds could gust as high as 15 mph.
Friday Night
Increasing clouds, with a low around 22. South wind around 7 mph becoming west after midnight.
Saturday
Mostly cloudy, with a high near 30. West wind around 6 mph becoming calm in the morning.
Saturday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 21. Calm wind becoming east around 6 mph after midnight.
Sunday
A 40 percent chance of snow before noon. Mostly cloudy, with a high near 30. East wind 6 to 10 mph becoming north in the afternoon. Winds could gust as high as 15 mph.
Sunday Night
Mostly cloudy, with a low around 8. North wind 5 to 9 mph.
Monday
Mostly sunny, with a high near 25.
Monday Night
Mostly cloudy, with a low around 14.
Tuesday
Partly sunny, with a high near 35.
Tuesday Night
Mostly cloudy, with a low around 25.
Wednesday
A chance of rain. Mostly cloudy, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 16.
Thursday
Partly sunny, with a high near 27.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
6:36 pm CST Dec 4, 2025
Forecast Valid:
7pm CST Dec 4, 2025-6pm CST Dec 11, 2025
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation