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

83°F

28°C

Humidity 59%
Wind Speed S 6 mph
Barometer 30.16 in (1020.7 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 6 Aug 5:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between midnight and 4am. Partly cloudy, with a low around 67. Light south southeast wind. Chance of precipitation is 20%.

    Low: 67 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: Mostly sunny, with a high near 89. South wind 3 to 6 mph.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 69. South southeast wind 3 to 5 mph.

    Low: 69 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 89. South wind 5 to 8 mph.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 70. South southeast wind around 6 mph.

    Low: 70 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 90. South wind 6 to 9 mph.

    High: 90 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 71. South southeast wind around 7 mph.

    Low: 71 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms between midnight and 4am. Partly cloudy, with a low around 67. Light south southeast wind. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 89. South wind 3 to 6 mph.
Thursday Night
Partly cloudy, with a low around 69. South southeast wind 3 to 5 mph.
Friday
Sunny, with a high near 89. South wind 5 to 8 mph.
Friday Night
Mostly clear, with a low around 70. South southeast wind around 6 mph.
Saturday
Sunny, with a high near 90. South wind 6 to 9 mph.
Saturday Night
Mostly clear, with a low around 71. South southeast wind around 7 mph.
Sunday
Mostly sunny, with a high near 89.
Sunday Night
Partly cloudy, with a low around 71.
Monday
Mostly sunny, with a high near 88.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
6:27 pm CDT Aug 6, 2025
Forecast Valid:
6pm CDT Aug 6, 2025-6pm CDT Aug 13, 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