National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
News Headlines
Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

A Few Clouds

57°F

14°C

Humidity 90%
Wind Speed NW 5 mph
Barometer 29.99 in (1015.3 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 11 Oct 5:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 83. Light and variable wind becoming north northwest around 5 mph in the afternoon.

    High: 83 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 59. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 59 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Mostly sunny, with a high near 91. Southwest wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 91 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Clear, with a low around 68. Southwest wind 7 to 9 mph, with gusts as high as 16 mph.

    Low: 68 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91. West southwest wind 9 to 11 mph, with gusts as high as 18 mph.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. Light and variable wind becoming northeast around 5 mph after midnight.

    Low: 65 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 80. North northeast wind around 7 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 80 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 59.

    Low: 59 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers likely. Mostly cloudy, with a high near 76. Chance of precipitation is 70%.

    High: 76 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 83. Light and variable wind becoming north northwest around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 59. Calm wind becoming south southwest around 6 mph after midnight.
Columbus Day
Mostly sunny, with a high near 91. Southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Monday Night
Clear, with a low around 68. Southwest wind 7 to 9 mph, with gusts as high as 16 mph.
Tuesday
Sunny, with a high near 91. West southwest wind 9 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. Light and variable wind becoming northeast around 5 mph after midnight.
Wednesday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 80. North northeast wind around 7 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 59.
Thursday
Showers likely. Mostly cloudy, with a high near 76. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 51.
Friday
Partly sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 37.
Saturday
Mostly sunny, with a high near 59.
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:
6:06 am CDT Oct 11, 2026
Forecast Valid:
6am CDT Oct 11, 2026-6pm CDT Oct 17, 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