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

33°F

1°C

Humidity 78%
Wind Speed S 7 mph
Barometer 30.22 in (1024.0 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 13 Feb 6:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Sunny, with a high near 54. South southwest wind 6 to 13 mph, with gusts as high as 18 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 32. South wind 5 to 7 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 40 percent chance of rain after noon. Mostly cloudy, with a high near 49. South wind 3 to 6 mph.

    High: 49 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 39. East wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 39 °F

    Rain

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a high near 55. Northeast wind 6 to 8 mph.

    High: 55 °F

    Gradual
    Clearing

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34. North northeast wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 57. South wind 3 to 7 mph.

    High: 57 °F

    Mostly Sunny

  • Monday Night

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

    Low: 39 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 59.

    High: 59 °F

    Mostly Cloudy

Detailed Forecast

Today
Sunny, with a high near 54. South southwest wind 6 to 13 mph, with gusts as high as 18 mph.
Tonight
Increasing clouds, with a low around 32. South wind 5 to 7 mph.
Saturday
A 40 percent chance of rain after noon. Mostly cloudy, with a high near 49. South wind 3 to 6 mph.
Saturday Night
Rain. Low around 39. East wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
Cloudy through mid morning, then gradual clearing, with a high near 55. Northeast wind 6 to 8 mph.
Sunday Night
Mostly clear, with a low around 34. North northeast wind around 5 mph becoming calm in the evening.
Washington's Birthday
Mostly sunny, with a high near 57. South wind 3 to 7 mph.
Monday Night
Mostly cloudy, with a low around 39.
Tuesday
Mostly cloudy, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 66. Breezy.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 43.
Thursday
Mostly sunny, with a high near 59.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
6:36 am CST Feb 13, 2026
Forecast Valid:
7am CST Feb 13, 2026-6pm CST Feb 19, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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