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

39°F

4°C

Humidity 62%
Wind Speed S 9 mph
Barometer 30.09 in (1019.3 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 12 Jan 9:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Partly cloudy, with a low around 33. South southwest wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 33 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 54. West southwest wind 10 to 16 mph, with gusts as high as 30 mph.

    High: 54 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35. West wind 7 to 13 mph, with gusts as high as 21 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature falling to around 27 by 5pm. Breezy, with a north northwest wind 14 to 22 mph, with gusts as high as 36 mph.

    High: 36 °F⇓

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 13. North northwest wind 11 to 17 mph, with gusts as high as 30 mph.

    Low: 13 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 28. Northwest wind 6 to 11 mph becoming west southwest in the afternoon. Winds could gust as high as 18 mph.

    High: 28 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 19. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.

    Low: 19 °F

    Chance Snow

  • Friday

    Friday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 37.

    High: 37 °F

    Mostly Cloudy
    then Chance
    Snow

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 33. South southwest wind 7 to 10 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 54. West southwest wind 10 to 16 mph, with gusts as high as 30 mph.
Tuesday Night
Mostly cloudy, with a low around 35. West wind 7 to 13 mph, with gusts as high as 21 mph.
Wednesday
Mostly cloudy, with a temperature falling to around 27 by 5pm. Breezy, with a north northwest wind 14 to 22 mph, with gusts as high as 36 mph.
Wednesday Night
Partly cloudy, with a low around 13. North northwest wind 11 to 17 mph, with gusts as high as 30 mph.
Thursday
Sunny, with a high near 28. Northwest wind 6 to 11 mph becoming west southwest in the afternoon. Winds could gust as high as 18 mph.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 19. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Friday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 37.
Friday Night
Mostly cloudy, with a low around 15.
Saturday
Mostly cloudy, with a high near 23.
Saturday Night
Mostly cloudy, with a low around 5.
Sunday
Partly sunny, with a high near 18.
Sunday Night
Partly cloudy, with a low around 7.
M.L.King Day
Mostly sunny, with a high near 27.
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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:
9:36 pm CST Jan 12, 2026
Forecast Valid:
10pm CST Jan 12, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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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