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.

Fog/Mist

69°F

21°C

Humidity 90%
Wind Speed NE 8 mph
Barometer 30.06 in (1017.4 mb)
Dewpoint 66°F (19°C)
Visibility 5.00 mi
Last update 15 Jun 10:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly cloudy, with a high near 80. Northeast wind around 6 mph.

    High: 80 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 67. East northeast wind 3 to 6 mph.

    Low: 67 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 84. Southeast wind 3 to 6 mph.

    High: 84 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 66. Light southeast wind.

    Low: 66 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88. South southwest wind 5 to 9 mph.

    High: 88 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly cloudy, with a low around 69. South southwest wind 6 to 9 mph, with gusts as high as 16 mph. Chance of precipitation is 50%.

    Low: 69 °F

    Partly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 83. Southwest wind 10 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 83 °F

    Chance
    T-storms then
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 80. Northeast wind around 6 mph.
Tonight
Mostly cloudy, with a low around 67. East northeast wind 3 to 6 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 84. Southeast wind 3 to 6 mph.
Monday Night
Mostly cloudy, with a low around 66. Light southeast wind.
Tuesday
Mostly sunny, with a high near 88. South southwest wind 5 to 9 mph.
Tuesday Night
A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly cloudy, with a low around 69. South southwest wind 6 to 9 mph, with gusts as high as 16 mph. Chance of precipitation is 50%.
Wednesday
A chance of showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 83. Southwest wind 10 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday Night
A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67.
Juneteenth
Mostly sunny, with a high near 82.
Thursday Night
Mostly clear, with a low around 64.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 70.
Saturday
Sunny, with a high near 90.
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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:
11:12 am CDT Jun 15, 2025
Forecast Valid:
11am CDT Jun 15, 2025-6pm CDT Jun 21, 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