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

29°F

-2°C

Humidity 49%
Wind Speed S 12 G 21 mph
Barometer 30.07 in (1018.9 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 21 Jan 3:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 41. West southwest wind 11 to 17 mph, with gusts as high as 28 mph.

    High: 41 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 19. West northwest wind 9 to 18 mph, with gusts as high as 31 mph.

    Low: 19 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 32. West wind 5 to 8 mph.

    High: 32 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 2. Wind chill values between -1 and -11. Light and variable wind becoming north northwest 11 to 16 mph in the evening. Winds could gust as high as 23 mph.

    Low: 2 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 8. North northwest wind 11 to 16 mph, with gusts as high as 24 mph.

    High: 8 °F

    Cold

  • Friday Night

    Friday Night: Mostly cloudy, with a low around -3. North northeast wind around 10 mph, with gusts as high as 18 mph.

    Low: -3 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 40 percent chance of snow after noon. Mostly cloudy, with a high near 12. Northeast wind 8 to 10 mph, with gusts as high as 16 mph.

    High: 12 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday Night

    Saturday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 5.

    Low: 5 °F

    Chance Snow

  • Sunday

    Sunday: Partly sunny, with a high near 17.

    High: 17 °F

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 41. West southwest wind 11 to 17 mph, with gusts as high as 28 mph.
Tonight
Mostly clear, with a low around 19. West northwest wind 9 to 18 mph, with gusts as high as 31 mph.
Thursday
Mostly sunny, with a high near 32. West wind 5 to 8 mph.
Thursday Night
Mostly cloudy, with a low around 2. Wind chill values between -1 and -11. Light and variable wind becoming north northwest 11 to 16 mph in the evening. Winds could gust as high as 23 mph.
Friday
Mostly cloudy and cold, with a high near 8. North northwest wind 11 to 16 mph, with gusts as high as 24 mph.
Friday Night
Mostly cloudy, with a low around -3. North northeast wind around 10 mph, with gusts as high as 18 mph.
Saturday
A 40 percent chance of snow after noon. Mostly cloudy, with a high near 12. Northeast wind 8 to 10 mph, with gusts as high as 16 mph.
Saturday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 5.
Sunday
Partly sunny, with a high near 17.
Sunday Night
Partly cloudy, with a low around 1.
Monday
Sunny, with a high near 18.
Monday Night
Mostly clear, with a low around 6.
Tuesday
Mostly sunny, with a high near 28.
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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:
4:26 am CST Jan 21, 2026
Forecast Valid:
4am CST Jan 21, 2026-6pm CST Jan 27, 2026
 
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Additional Resources

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Chance of Precipitation