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.

Overcast

30°F

-1°C

Humidity 79%
Wind Speed N 15 mph
Barometer 30.13 in (1021.3 mb)
Dewpoint 24°F (-4°C)
Visibility 9.00 mi
Wind Chill19°F (-7°C)
Last update 3 Feb 12:53 pm CST
Extended Forecast for

Sullivan IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 32. North northeast wind 8 to 11 mph, with gusts as high as 17 mph.

    High: 32 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 13. Wind chill values between 3 and 8. North northeast wind around 8 mph.

    Low: 13 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 25. Wind chill values between 2 and 12. North northeast wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 25 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 8. Light and variable wind.

    Low: 8 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 31. South southwest wind 5 to 10 mph, with gusts as high as 18 mph.

    High: 31 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 24. South wind 8 to 13 mph becoming west after midnight. Winds could gust as high as 23 mph.

    Low: 24 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 39. Northwest wind 13 to 16 mph, with gusts as high as 28 mph.

    High: 39 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 31.

    High: 31 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 32. North northeast wind 8 to 11 mph, with gusts as high as 17 mph.
Tonight
Mostly cloudy, with a low around 13. Wind chill values between 3 and 8. North northeast wind around 8 mph.
Wednesday
Partly sunny, with a high near 25. Wind chill values between 2 and 12. North northeast wind 6 to 9 mph, with gusts as high as 15 mph.
Wednesday Night
Partly cloudy, with a low around 8. Light and variable wind.
Thursday
Mostly cloudy, with a high near 31. South southwest wind 5 to 10 mph, with gusts as high as 18 mph.
Thursday Night
Partly cloudy, with a low around 24. South wind 8 to 13 mph becoming west after midnight. Winds could gust as high as 23 mph.
Friday
Mostly sunny, with a high near 39. Northwest wind 13 to 16 mph, with gusts as high as 28 mph.
Friday Night
Partly cloudy, with a low around 18.
Saturday
Sunny, with a high near 31.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
Partly sunny, with a high near 37.
Sunday Night
Partly cloudy, with a low around 19.
Monday
Mostly sunny, with a high near 40.
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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:
1:47 pm CST Feb 3, 2026
Forecast Valid:
1pm CST Feb 3, 2026-6pm CST Feb 9, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation