National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

55°F

13°C

Humidity 64%
Wind Speed S 9 mph
Barometer 30.18 in (1021.7 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 9 Apr 5:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly sunny, with a high near 77. Southwest wind 13 to 17 mph, with gusts as high as 28 mph.

    High: 77 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 57. South wind 10 to 15 mph, with gusts as high as 23 mph.

    Low: 57 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7am. Mostly cloudy, with a high near 64. Southwest wind 10 to 13 mph becoming north in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 43. East northeast wind 7 to 9 mph, with gusts as high as 15 mph.

    Low: 43 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 68. East northeast wind around 10 mph becoming southeast in the afternoon. Winds could gust as high as 16 mph.

    High: 68 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 56. Southeast wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 78. Breezy, with a south southwest wind 11 to 16 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph.

    High: 78 °F

    Partly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Sunday Night

    Sunday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.

    Low: 62 °F

    Chance
    Showers then
    Showers
    Likely

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Breezy. Chance of precipitation is 40%.

    High: 79 °F

    Breezy.
    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 77. Southwest wind 13 to 17 mph, with gusts as high as 28 mph.
Tonight
A 30 percent chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 57. South wind 10 to 15 mph, with gusts as high as 23 mph.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7am. Mostly cloudy, with a high near 64. Southwest wind 10 to 13 mph becoming north in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Mostly cloudy, with a low around 43. East northeast wind 7 to 9 mph, with gusts as high as 15 mph.
Saturday
Partly sunny, with a high near 68. East northeast wind around 10 mph becoming southeast in the afternoon. Winds could gust as high as 16 mph.
Saturday Night
Mostly cloudy, with a low around 56. Southeast wind 7 to 11 mph, with gusts as high as 20 mph.
Sunday
Mostly cloudy, with a high near 78. Breezy, with a south southwest wind 11 to 16 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph.
Sunday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Breezy. Chance of precipitation is 40%.
Monday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 65.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. Breezy.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 59.
Wednesday
A chance of showers. Mostly cloudy, with a high near 73.
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:
4:08 am CDT Apr 9, 2026
Forecast Valid:
6am CDT Apr 9, 2026-6pm CDT Apr 15, 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