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.

Fog/Mist

33°F

1°C

Humidity 92%
Wind Speed N 16 G 31 mph
Barometer 30.10 in (1020.0 mb)
Dewpoint 31°F (-1°C)
Visibility 5.00 mi
Wind Chill23°F (-5°C)
Last update 7 Dec 2:53 pm CST
Extended Forecast for

Sullivan IL

  • This Afternoon

    This Afternoon: Patchy fog before 4pm. Otherwise, cloudy, with a high near 34. North northeast wind around 11 mph, with gusts as high as 21 mph.

    High: 34 °F

    Patchy Fog

  • Tonight

    Tonight: Mostly cloudy, with a low around 16. North northeast wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 16 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 28. North northeast wind around 6 mph becoming calm in the morning.

    High: 28 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 18. Light south wind becoming south southwest 9 to 14 mph in the evening. Winds could gust as high as 21 mph.

    Low: 18 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 42. Southwest wind 11 to 14 mph, with gusts as high as 21 mph.

    High: 42 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35. South southwest wind 11 to 18 mph, with gusts as high as 30 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 42. West northwest wind 11 to 18 mph, with gusts as high as 32 mph.

    High: 42 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of snow. Mostly cloudy, with a high near 30.

    High: 30 °F

    Chance Snow

Detailed Forecast

This Afternoon
Patchy fog before 4pm. Otherwise, cloudy, with a high near 34. North northeast wind around 11 mph, with gusts as high as 21 mph.
Tonight
Mostly cloudy, with a low around 16. North northeast wind 6 to 10 mph, with gusts as high as 18 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 28. North northeast wind around 6 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 18. Light south wind becoming south southwest 9 to 14 mph in the evening. Winds could gust as high as 21 mph.
Tuesday
Partly sunny, with a high near 42. Southwest wind 11 to 14 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 35. South southwest wind 11 to 18 mph, with gusts as high as 30 mph.
Wednesday
Mostly cloudy, with a high near 42. West northwest wind 11 to 18 mph, with gusts as high as 32 mph.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
A 50 percent chance of snow. Mostly cloudy, with a high near 30.
Thursday Night
Mostly cloudy, with a low around 13.
Friday
Partly sunny, with a high near 22.
Friday Night
Mostly cloudy, with a low around 0.
Saturday
Partly sunny, with a high near 13.
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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:
3:16 pm CST Dec 7, 2025
Forecast Valid:
3pm CST Dec 7, 2025-6pm CST Dec 13, 2025
 
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Additional Resources

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Chance of Precipitation