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

26°F

-3°C

Humidity 92%
Wind Speed NW 5 mph
Barometer 29.90 in (1013.2 mb)
Dewpoint 24°F (-4°C)
Visibility 9.00 mi
Wind Chill20°F (-7°C)
Last update 1 Jan 9:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 23. North northwest wind 3 to 5 mph.

    Low: 23 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 34. North northeast wind 5 to 7 mph.

    High: 34 °F

    Partly Sunny

  • Friday Night

    Friday Night: Cloudy, with a low around 23. Northeast wind around 6 mph.

    Low: 23 °F

    Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 36. Northeast wind around 6 mph becoming light and variable in the afternoon.

    High: 36 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 19. Light north northwest wind.

    Low: 19 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 37. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 37 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 28. South southeast wind 5 to 11 mph, with gusts as high as 20 mph.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 23. North northwest wind 3 to 5 mph.
Friday
Partly sunny, with a high near 34. North northeast wind 5 to 7 mph.
Friday Night
Cloudy, with a low around 23. Northeast wind around 6 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 36. Northeast wind around 6 mph becoming light and variable in the afternoon.
Saturday Night
Mostly clear, with a low around 19. Light north northwest wind.
Sunday
Increasing clouds, with a high near 37. Calm wind becoming south southeast around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 28. South southeast wind 5 to 11 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 51.
Monday Night
Mostly cloudy, with a low around 38.
Tuesday
Partly sunny, with a high near 57.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Partly sunny, with a high near 51.
Wednesday Night
Partly cloudy, with a low around 36.
Thursday
A chance of rain. Mostly cloudy, with a high near 55.
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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:
9:56 pm CST Jan 1, 2026
Forecast Valid:
10pm CST Jan 1, 2026-6pm CST Jan 8, 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