National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

10°F

-12°C

Humidity 63%
Wind Speed SW 3 mph
Barometer 30.39 in (1030.7 mb)
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Last update 20 Jan 3:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly sunny, with a high near 29. Wind chill values between -1 and 9. South southwest wind 6 to 14 mph, with gusts as high as 23 mph.

    High: 29 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 23. South wind 13 to 17 mph, with gusts as high as 28 mph.

    Low: 23 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 40. West wind 9 to 16 mph, with gusts as high as 28 mph.

    High: 40 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 20. West southwest wind 8 to 14 mph, with gusts as high as 26 mph.

    Low: 20 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 30. West northwest wind 6 to 10 mph, with gusts as high as 17 mph.

    High: 30 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 5. West northwest wind 5 to 10 mph, with gusts as high as 16 mph.

    Low: 5 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 11. North wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 11 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around -1.

    Low: -1 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 12.

    High: 12 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Today
Mostly sunny, with a high near 29. Wind chill values between -1 and 9. South southwest wind 6 to 14 mph, with gusts as high as 23 mph.
Tonight
Mostly cloudy, with a low around 23. South wind 13 to 17 mph, with gusts as high as 28 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 40. West wind 9 to 16 mph, with gusts as high as 28 mph.
Wednesday Night
Partly cloudy, with a low around 20. West southwest wind 8 to 14 mph, with gusts as high as 26 mph.
Thursday
Mostly sunny, with a high near 30. West northwest wind 6 to 10 mph, with gusts as high as 17 mph.
Thursday Night
Mostly cloudy, with a low around 5. West northwest wind 5 to 10 mph, with gusts as high as 16 mph.
Friday
Mostly cloudy, with a high near 11. North wind 10 to 13 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around -1.
Saturday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 12.
Saturday Night
A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 3.
Sunday
Mostly sunny, with a high near 20.
Sunday Night
Partly cloudy, with a low around 2.
Monday
Sunny, with a high near 22.
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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:
3:36 am CST Jan 20, 2026
Forecast Valid:
4am CST Jan 20, 2026-6pm CST Jan 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation