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

35°F

2°C

Humidity 64%
Wind Speed SE 10 mph
Barometer 30.04 in (1018.1 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 9 Feb 6:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Partly cloudy, with a low around 32. South wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 32 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. Southwest wind 9 to 13 mph becoming northwest in the morning. Winds could gust as high as 21 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 25. North northwest wind around 8 mph, with gusts as high as 15 mph.

    Low: 25 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 42. Northwest wind 5 to 8 mph.

    High: 42 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 26. Light and variable wind.

    Low: 26 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy, with a high near 41. Calm wind becoming east southeast around 6 mph in the morning.

    High: 41 °F

    Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 27. East wind around 6 mph.

    Low: 27 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 32. South wind 8 to 13 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 51. Southwest wind 9 to 13 mph becoming northwest in the morning. Winds could gust as high as 21 mph.
Tuesday Night
Mostly clear, with a low around 25. North northwest wind around 8 mph, with gusts as high as 15 mph.
Wednesday
Sunny, with a high near 42. Northwest wind 5 to 8 mph.
Wednesday Night
Increasing clouds, with a low around 26. Light and variable wind.
Thursday
Cloudy, with a high near 41. Calm wind becoming east southeast around 6 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 27. East wind around 6 mph.
Friday
Partly sunny, with a high near 42.
Friday Night
Mostly cloudy, with a low around 29.
Saturday
A 50 percent chance of rain. Cloudy, with a high near 44.
Saturday Night
Rain. Cloudy, with a low around 33.
Sunday
Rain likely. Mostly cloudy, with a high near 46.
Sunday Night
Partly cloudy, with a low around 30.
Washington's Birthday
Mostly sunny, with a high near 50.
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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:
6:36 pm CST Feb 9, 2026
Forecast Valid:
7pm CST Feb 9, 2026-6pm CST Feb 16, 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