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

32°F

0°C

Humidity 92%
Wind Speed N 20 G 33 mph
Barometer 30.12 in (1020.8 mb)
Dewpoint 30°F (-1°C)
Visibility 7.00 mi
Wind Chill20°F (-7°C)
Last update 7 Dec 3:53 pm CST
Extended Forecast for

Sullivan IL

  • 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. West northwest wind 6 to 9 mph.

    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

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 13.

    Low: 13 °F

    Mostly Cloudy

Detailed Forecast

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. West northwest wind 6 to 9 mph.
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.
Saturday Night
Mostly cloudy, with a low around 0.
Sunday
Mostly sunny, with a high near 18.
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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:
3:16 pm CST Dec 7, 2025
Forecast Valid:
4pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
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