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

36°F

2°C

Humidity 76%
Wind Speed NW 10 mph
Barometer 30.06 in (1018.5 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 10 Feb 8:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Mostly clear, with a low around 26. North northwest wind 8 to 10 mph, with gusts as high as 16 mph.

    Low: 26 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 44. Northwest wind 7 to 10 mph, with gusts as high as 16 mph.

    High: 44 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 26. West northwest wind around 5 mph becoming calm in the evening.

    Low: 26 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy, with a high near 43. Calm wind becoming south southeast around 5 mph.

    High: 43 °F

    Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 27. Light southeast wind.

    Low: 27 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 46. South southeast wind 3 to 6 mph.

    High: 46 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 30. South southeast wind 3 to 5 mph.

    Low: 30 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 49.

    High: 49 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 26. North northwest wind 8 to 10 mph, with gusts as high as 16 mph.
Wednesday
Sunny, with a high near 44. Northwest wind 7 to 10 mph, with gusts as high as 16 mph.
Wednesday Night
Increasing clouds, with a low around 26. West northwest wind around 5 mph becoming calm in the evening.
Thursday
Cloudy, with a high near 43. Calm wind becoming south southeast around 5 mph.
Thursday Night
Mostly cloudy, with a low around 27. Light southeast wind.
Friday
Mostly sunny, with a high near 46. South southeast wind 3 to 6 mph.
Friday Night
Partly cloudy, with a low around 30. South southeast wind 3 to 5 mph.
Saturday
Mostly cloudy, with a high near 49.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 35.
Sunday
A 40 percent chance of rain before noon. Mostly sunny, with a high near 52.
Sunday Night
Mostly clear, with a low around 31.
Washington's Birthday
Mostly sunny, with a high near 55.
Monday Night
Mostly cloudy, with a low around 37.
Tuesday
Partly sunny, with a high near 57.
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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:
8:37 pm CST Feb 10, 2026
Forecast Valid:
9pm CST Feb 10, 2026-6pm CST Feb 17, 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