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

68°F

20°C

Humidity 65%
Wind Speed Calm
Barometer 30.11 in (1019.4 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 1 Sep 7:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Mostly clear, with a low around 53. Light north northeast wind.

    Low: 53 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 82. Light and variable wind.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 55. Light and variable wind.

    Low: 55 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. Light southwest wind becoming west southwest 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Showers, mainly before 1am. Low around 51. West southwest wind around 7 mph becoming north northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 51 °F

    Showers

  • Thursday

    Thursday: Partly sunny, then gradually becoming sunny, with a high near 70. North northwest wind 7 to 9 mph.

    High: 70 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 50. Calm wind becoming south around 6 mph after midnight.

    Low: 50 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 53. Light north northeast wind.
Tuesday
Sunny, with a high near 82. Light and variable wind.
Tuesday Night
Mostly clear, with a low around 55. Light and variable wind.
Wednesday
Sunny, with a high near 84. Light southwest wind becoming west southwest 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Wednesday Night
Showers, mainly before 1am. Low around 51. West southwest wind around 7 mph becoming north northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
Partly sunny, then gradually becoming sunny, with a high near 70. North northwest wind 7 to 9 mph.
Thursday Night
Mostly clear, with a low around 50. Calm wind becoming south around 6 mph after midnight.
Friday
Mostly sunny, with a high near 76.
Friday Night
Mostly clear, with a low around 46.
Saturday
Sunny, with a high near 74.
Saturday Night
Mostly clear, with a low around 47.
Sunday
Sunny, with a high near 74.
Sunday Night
Mostly clear, with a low around 47.
Monday
Mostly sunny, with a high near 76.
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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:
7:40 pm CDT Sep 1, 2025
Forecast Valid:
8pm CDT Sep 1, 2025-6pm CDT Sep 8, 2025
 
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