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

30°F

-1°C

Humidity 75%
Wind Speed SW 9 mph
Barometer 29.86 in (1012.0 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 6 Dec 1:53 am CST
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 21. Southwest wind around 8 mph.

    Low: 21 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 32. West wind around 6 mph becoming calm in the morning.

    High: 32 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 26. Calm wind becoming southeast around 6 mph after midnight.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A chance of rain and snow before noon. Mostly cloudy, with a high near 33. South southeast wind 6 to 10 mph becoming north in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 50%.

    High: 33 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 11. North wind 6 to 10 mph, with gusts as high as 15 mph.

    Low: 11 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 25. North northeast wind around 6 mph becoming calm in the morning.

    High: 25 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 14. Light and variable wind becoming south southwest 6 to 11 mph in the evening. Winds could gust as high as 20 mph.

    Low: 14 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Overnight
Mostly cloudy, with a low around 21. Southwest wind around 8 mph.
Saturday
Mostly cloudy, with a high near 32. West wind around 6 mph becoming calm in the morning.
Saturday Night
A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 26. Calm wind becoming southeast around 6 mph after midnight.
Sunday
A chance of rain and snow before noon. Mostly cloudy, with a high near 33. South southeast wind 6 to 10 mph becoming north in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 50%.
Sunday Night
Mostly cloudy, with a low around 11. North wind 6 to 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 25. North northeast wind around 6 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 14. Light and variable wind becoming south southwest 6 to 11 mph in the evening. Winds could gust as high as 20 mph.
Tuesday
Partly sunny, with a high near 38.
Tuesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 30.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 40.
Wednesday Night
Mostly cloudy, with a low around 20.
Thursday
Mostly cloudy, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 15.
Friday
Partly sunny, with a high near 24.
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:
8:36 pm CST Dec 5, 2025
Forecast Valid:
2am CST Dec 6, 2025-6pm CST Dec 12, 2025
 
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