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

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fog/Mist

34°F

1°C

Humidity 97%
Wind Speed S 7 mph
Barometer 29.96 in (1015.2 mb)
Dewpoint 33°F (1°C)
Visibility 3.00 mi
Wind Chill28°F (-2°C)
Last update 7 Dec 6:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Areas of fog before 4pm. Otherwise, cloudy, with a high near 34. South wind 5 to 14 mph becoming north in the afternoon. Winds could gust as high as 24 mph.

    High: 34 °F

    Areas Fog

  • Tonight

    Tonight: Mostly cloudy, with a low around 16. North wind 7 to 13 mph, with gusts as high as 21 mph.

    Low: 16 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 29. North northeast wind 5 to 7 mph becoming calm in the morning.

    High: 29 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 16. Light south wind becoming south southwest 10 to 15 mph in the evening. Winds could gust as high as 23 mph.

    Low: 16 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 43. South southwest wind 13 to 15 mph, with gusts as high as 23 mph.

    High: 43 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36. Southwest wind 14 to 18 mph, with gusts as high as 29 mph.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 42. West northwest wind 11 to 18 mph, with gusts as high as 28 mph.

    High: 42 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of snow. Mostly cloudy, with a high near 31.

    High: 31 °F

    Chance Snow

Detailed Forecast

Today
Areas of fog before 4pm. Otherwise, cloudy, with a high near 34. South wind 5 to 14 mph becoming north in the afternoon. Winds could gust as high as 24 mph.
Tonight
Mostly cloudy, with a low around 16. North wind 7 to 13 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 29. North northeast wind 5 to 7 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 16. Light south wind becoming south southwest 10 to 15 mph in the evening. Winds could gust as high as 23 mph.
Tuesday
Partly sunny, with a high near 43. South southwest wind 13 to 15 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 36. Southwest wind 14 to 18 mph, with gusts as high as 29 mph.
Wednesday
Mostly cloudy, with a high near 42. West northwest wind 11 to 18 mph, with gusts as high as 28 mph.
Wednesday Night
Mostly cloudy, with a low around 23.
Thursday
A 30 percent chance of snow. Mostly cloudy, with a high near 31.
Thursday Night
Mostly cloudy, with a low around 12.
Friday
Partly sunny, with a high near 21.
Friday Night
Mostly cloudy, with a low around 2.
Saturday
Partly sunny, with a high near 15.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
4:57 am CST Dec 7, 2025
Forecast Valid:
7am CST Dec 7, 2025-6pm CST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation