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.

Fair

30°F

-1°C

Humidity 49%
Wind Speed SE 13 mph
Barometer 30.18 in (1022.9 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 8 Feb 4:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Partly cloudy, with a low around 22. East southeast wind 5 to 9 mph, with gusts as high as 16 mph.

    Low: 22 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 43. East wind around 6 mph becoming south in the afternoon.

    High: 43 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 32. South southeast wind 7 to 10 mph becoming west southwest after midnight. Winds could gust as high as 18 mph.

    Low: 32 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 50. West southwest wind 7 to 9 mph becoming northwest in the morning.

    High: 50 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 26. North northwest wind around 6 mph.

    Low: 26 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 43. North northwest wind around 7 mph.

    High: 43 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 26. Light and variable wind becoming east northeast around 6 mph after midnight.

    Low: 26 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 39.

    High: 39 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Chance Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 22. East southeast wind 5 to 9 mph, with gusts as high as 16 mph.
Monday
Mostly sunny, with a high near 43. East wind around 6 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 32. South southeast wind 7 to 10 mph becoming west southwest after midnight. Winds could gust as high as 18 mph.
Tuesday
Sunny, with a high near 50. West southwest wind 7 to 9 mph becoming northwest in the morning.
Tuesday Night
Partly cloudy, with a low around 26. North northwest wind around 6 mph.
Wednesday
Mostly sunny, with a high near 43. North northwest wind around 7 mph.
Wednesday Night
Partly cloudy, with a low around 26. Light and variable wind becoming east northeast around 6 mph after midnight.
Thursday
Mostly cloudy, with a high near 39.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 26.
Friday
Mostly sunny, with a high near 40.
Friday Night
A chance of rain and snow. Partly cloudy, with a low around 25.
Saturday
A chance of rain. Partly sunny, with a high near 41.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 29.
Sunday
Mostly sunny, with a high near 44.
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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:
5:37 pm CST Feb 8, 2026
Forecast Valid:
5pm CST Feb 8, 2026-6pm CST Feb 15, 2026
 
Forecast Discussion
 
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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