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

87°F

31°C

Humidity 61%
Wind Speed S 9 mph
Barometer 30.03 in (1016.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 9 Aug 4:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Partly cloudy, with a low around 70. South southeast wind 6 to 10 mph, with gusts as high as 16 mph.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 89. South wind 6 to 10 mph, with gusts as high as 15 mph.

    High: 89 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 71. South wind around 6 mph.

    Low: 71 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 89. South southwest wind 5 to 8 mph.

    High: 89 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70. South wind 3 to 5 mph.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. South southwest wind 3 to 7 mph.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 68. Light west southwest wind.

    Low: 68 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 70. South southeast wind 6 to 10 mph, with gusts as high as 16 mph.
Sunday
Mostly sunny, with a high near 89. South wind 6 to 10 mph, with gusts as high as 15 mph.
Sunday Night
Partly cloudy, with a low around 71. South wind around 6 mph.
Monday
Mostly sunny, with a high near 89. South southwest wind 5 to 8 mph.
Monday Night
Partly cloudy, with a low around 70. South wind 3 to 5 mph.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. South southwest wind 3 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 68. Light west southwest wind.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Thursday Night
Partly cloudy, with a low around 69.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Friday Night
Partly cloudy, with a low around 69.
Saturday
Mostly sunny, with a high near 89.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
4:39 pm CDT Aug 9, 2025
Forecast Valid:
5pm CDT Aug 9, 2025-6pm CDT Aug 16, 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