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

8°F

-13°C

Humidity 92%
Wind Speed S 3 mph
Barometer 30.27 in (1026.2 mb)
Dewpoint 6°F (-14°C)
Visibility 7.00 mi
Last update 5 Feb 2:53 am CST
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Patchy fog. Otherwise, partly cloudy, with a low around 5. Calm wind.

    Low: 5 °F

    Patchy Fog

  • Thursday

    Thursday: A chance of flurries between noon and 3pm. Mostly cloudy, with a high near 29. Wind chill values between 1 and 11. Light south southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 17 mph.

    High: 29 °F

    Chance
    Flurries

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 23. South wind 6 to 8 mph becoming west after midnight.

    Low: 23 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 38. West wind 9 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 38 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 14. North wind 7 to 11 mph, with gusts as high as 23 mph.

    Low: 14 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 26. North northeast wind around 6 mph becoming southeast in the afternoon.

    High: 26 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 18. South southeast wind 6 to 10 mph, with gusts as high as 16 mph.

    Low: 18 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog. Otherwise, partly cloudy, with a low around 5. Calm wind.
Thursday
A chance of flurries between noon and 3pm. Mostly cloudy, with a high near 29. Wind chill values between 1 and 11. Light south southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 17 mph.
Thursday Night
Mostly cloudy, with a low around 23. South wind 6 to 8 mph becoming west after midnight.
Friday
Mostly cloudy, with a high near 38. West wind 9 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 14. North wind 7 to 11 mph, with gusts as high as 23 mph.
Saturday
Sunny, with a high near 26. North northeast wind around 6 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 18. South southeast wind 6 to 10 mph, with gusts as high as 16 mph.
Sunday
Mostly sunny, with a high near 41.
Sunday Night
Partly cloudy, with a low around 24.
Monday
Sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Partly sunny, with a high near 54.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 36.
Wednesday
A chance of rain. Cloudy, with a high near 48.
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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:
3:17 am CST Feb 5, 2026
Forecast Valid:
3am CST Feb 5, 2026-6pm CST Feb 11, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation