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

71°F

22°C

Humidity 39%
Wind Speed NW 12 mph
Barometer 29.85 in (1010.5 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 20 Mar 6:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Partly cloudy, with a low around 45. Northwest wind 5 to 9 mph becoming east after midnight. Winds could gust as high as 15 mph.

    Low: 45 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 76. East wind 5 to 9 mph becoming southwest in the afternoon.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 58. South southwest wind 6 to 11 mph, with gusts as high as 20 mph.

    Low: 58 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 80. South southwest wind 10 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 35. North wind 14 to 18 mph, with gusts as high as 29 mph.

    Low: 35 °F

    Decreasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 52. North wind 9 to 13 mph, with gusts as high as 20 mph.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 35. Northeast wind around 6 mph becoming east southeast after midnight.

    Low: 35 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 45. Northwest wind 5 to 9 mph becoming east after midnight. Winds could gust as high as 15 mph.
Saturday
Sunny, with a high near 76. East wind 5 to 9 mph becoming southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 58. South southwest wind 6 to 11 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 80. South southwest wind 10 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 35. North wind 14 to 18 mph, with gusts as high as 29 mph.
Monday
Sunny, with a high near 52. North wind 9 to 13 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 35. Northeast wind around 6 mph becoming east southeast after midnight.
Tuesday
Partly sunny, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
Mostly cloudy, with a high near 59.
Wednesday Night
Mostly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 74.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 36.
Friday
Partly sunny, with a high near 48.
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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:
7:36 pm CDT Mar 20, 2026
Forecast Valid:
7pm CDT Mar 20, 2026-6pm CDT Mar 27, 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