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.

Partly Cloudy

83°F

28°C

Humidity 46%
Wind Speed NE 9 mph
Barometer 30.12 in (1019.4 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 28 Aug 3:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Mostly clear, with a low around 60. East northeast wind around 5 mph becoming light and variable in the evening.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 86. South southeast wind 3 to 7 mph.

    High: 86 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 67. South southeast wind 5 to 7 mph.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 91. South southwest wind 7 to 13 mph, with gusts as high as 21 mph.

    High: 91 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72. South wind around 8 mph.

    Low: 72 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 96. South southwest wind 9 to 11 mph, with gusts as high as 17 mph.

    High: 96 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. South wind around 8 mph.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 60. East northeast wind around 5 mph becoming light and variable in the evening.
Saturday
Increasing clouds, with a high near 86. South southeast wind 3 to 7 mph.
Saturday Night
Partly cloudy, with a low around 67. South southeast wind 5 to 7 mph.
Sunday
Mostly sunny, with a high near 91. South southwest wind 7 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 72. South wind around 8 mph.
Monday
Sunny and hot, with a high near 96. South southwest wind 9 to 11 mph, with gusts as high as 17 mph.
Monday Night
Mostly clear, with a low around 74. South wind around 8 mph.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Mostly clear, with a low around 76.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
Sunny and hot, with a high near 96.
Thursday Night
Mostly clear, with a low around 73.
Friday
Mostly sunny and hot, with a high near 95.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
3:36 pm CDT Aug 28, 2026
Forecast Valid:
4pm CDT Aug 28, 2026-6pm CDT Sep 4, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation