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

29°F

-2°C

Humidity 54%
Wind Speed NE 8 mph
Barometer 30.37 in (1029.4 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 7 Feb 3:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Increasing clouds, with a low around 20. Southeast wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 20 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 33. Southeast wind 9 to 14 mph, with gusts as high as 23 mph.

    High: 33 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22. East southeast wind 6 to 8 mph.

    Low: 22 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 45. South wind around 6 mph.

    High: 45 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 33. South wind 6 to 9 mph, with gusts as high as 16 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 54. Southwest wind 6 to 9 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph.

    High: 54 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 30. North northeast wind 6 to 8 mph.

    Low: 30 °F

    Chance Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 44.

    High: 44 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 20. Southeast wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday
Partly sunny, with a high near 33. Southeast wind 9 to 14 mph, with gusts as high as 23 mph.
Sunday Night
Partly cloudy, with a low around 22. East southeast wind 6 to 8 mph.
Monday
Mostly sunny, with a high near 45. South wind around 6 mph.
Monday Night
Mostly clear, with a low around 33. South wind 6 to 9 mph, with gusts as high as 16 mph.
Tuesday
Mostly sunny, with a high near 54. Southwest wind 6 to 9 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 30. North northeast wind 6 to 8 mph.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
A 30 percent chance of rain after noon. Cloudy, with a high near 40.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 24.
Friday
Partly sunny, with a high near 40.
Friday Night
Mostly cloudy, with a low around 23.
Saturday
A chance of rain and snow. Mostly sunny, with a high near 38.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
3:37 pm CST Feb 7, 2026
Forecast Valid:
4pm CST Feb 7, 2026-6pm CST Feb 14, 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