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.

Mostly Cloudy

26°F

-3°C

Humidity 63%
Wind Speed SE 9 mph
Barometer 30.19 in (1023.4 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 17 Mar 9:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: A 50 percent chance of snow, mainly between 11pm and 4am. Cloudy, with a low around 25. South southeast wind 7 to 14 mph, with gusts as high as 24 mph.

    Low: 25 °F

    Chance Snow

  • Wednesday

    Wednesday: Cloudy through mid morning, then gradual clearing, with a high near 53. South wind 9 to 14 mph becoming west southwest in the afternoon. Winds could gust as high as 25 mph.

    High: 53 °F

    Gradual
    Clearing

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 37. West wind around 6 mph becoming south after midnight.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 64. South wind 6 to 9 mph becoming west in the afternoon.

    High: 64 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 38. North northeast wind around 6 mph.

    Low: 38 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 66. East wind 5 to 9 mph becoming west southwest in the afternoon.

    High: 66 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 45. West southwest wind around 8 mph.

    Low: 45 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of snow, mainly between 11pm and 4am. Cloudy, with a low around 25. South southeast wind 7 to 14 mph, with gusts as high as 24 mph.
Wednesday
Cloudy through mid morning, then gradual clearing, with a high near 53. South wind 9 to 14 mph becoming west southwest in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
Mostly cloudy, with a low around 37. West wind around 6 mph becoming south after midnight.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 64. South wind 6 to 9 mph becoming west in the afternoon.
Thursday Night
Partly cloudy, with a low around 38. North northeast wind around 6 mph.
Friday
Mostly sunny, with a high near 66. East wind 5 to 9 mph becoming west southwest in the afternoon.
Friday Night
Partly cloudy, with a low around 45. West southwest wind around 8 mph.
Saturday
Mostly sunny, with a high near 74.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Mostly sunny, with a high near 72.
Sunday Night
Partly cloudy, with a low around 35.
Monday
Mostly sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Mostly sunny, with a high near 53.
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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:
9:36 pm CDT Mar 17, 2026
Forecast Valid:
10pm CDT Mar 17, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation