National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Mostly Cloudy

73°F

23°C

Humidity 76%
Wind Speed NE 6 mph
Barometer 29.95 in (1013.6 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 26 May 7:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 62. East southeast wind around 6 mph becoming northeast after midnight.

    Low: 62 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 80. North northeast wind 5 to 8 mph. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59. Northeast wind around 6 mph becoming light and variable.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Northeast wind 7 to 11 mph, with gusts as high as 16 mph.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58. East northeast wind 7 to 9 mph.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 78. East wind around 8 mph.

    High: 78 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 58. East wind 3 to 6 mph.

    Low: 58 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 62. East southeast wind around 6 mph becoming northeast after midnight.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 80. North northeast wind 5 to 8 mph. Chance of precipitation is 40%.
Wednesday Night
Mostly clear, with a low around 59. Northeast wind around 6 mph becoming light and variable.
Thursday
Mostly sunny, with a high near 82. Northeast wind 7 to 11 mph, with gusts as high as 16 mph.
Thursday Night
Partly cloudy, with a low around 58. East northeast wind 7 to 9 mph.
Friday
Partly sunny, with a high near 78. East wind around 8 mph.
Friday Night
Mostly cloudy, with a low around 58. East wind 3 to 6 mph.
Saturday
Mostly sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Mostly sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 56.
Monday
Mostly sunny, with a high near 78.
Monday Night
Mostly clear, with a low around 55.
Tuesday
Sunny, with a high near 78.
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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:
7:36 pm CDT May 26, 2026
Forecast Valid:
8pm CDT May 26, 2026-6pm CDT Jun 2, 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