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.

Overcast

23°F

-5°C

Humidity 78%
Wind Speed N 5 mph
Barometer 30.35 in (1028.7 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 4 Feb 9:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, increasing clouds, with a low around 9. Wind chill values between 2 and 7. Light and variable wind.

    Low: 9 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Mostly cloudy, with a high near 29. Wind chill values between 2 and 12. South southwest wind 5 to 13 mph, with gusts as high as 20 mph.

    High: 29 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 22. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.

    Low: 22 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 40. West southwest wind 11 to 17 mph becoming north northwest in the afternoon. Winds could gust as high as 29 mph.

    High: 40 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 15. North wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 15 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 28. North northeast wind around 6 mph becoming east southeast in the afternoon.

    High: 28 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 18. South southeast wind 6 to 9 mph, with gusts as high as 16 mph.

    Low: 18 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, increasing clouds, with a low around 9. Wind chill values between 2 and 7. Light and variable wind.
Thursday
Mostly cloudy, with a high near 29. Wind chill values between 2 and 12. South southwest wind 5 to 13 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 22. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.
Friday
Partly sunny, with a high near 40. West southwest wind 11 to 17 mph becoming north northwest in the afternoon. Winds could gust as high as 29 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 15. North wind 7 to 13 mph, with gusts as high as 22 mph.
Saturday
Mostly sunny, with a high near 28. North northeast wind around 6 mph becoming east southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 18. South southeast wind 6 to 9 mph, with gusts as high as 16 mph.
Sunday
Partly sunny, with a high near 42.
Sunday Night
Mostly clear, with a low around 24.
Monday
Mostly sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Partly sunny, with a high near 54.
Tuesday Night
A chance of rain. Partly cloudy, with a low around 35.
Wednesday
A chance of rain. Mostly sunny, with a high near 49.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
10:11 pm CST Feb 4, 2026
Forecast Valid:
10pm CST Feb 4, 2026-6pm CST Feb 11, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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