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.

Overcast

65°F

18°C

Humidity 93%
Wind Speed SW 5 mph
Barometer 30.02 in (1016.3 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 3 Apr 7:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: A slight chance of showers and thunderstorms before 9am, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 77. South southwest wind 6 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.

    High: 77 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 60. South wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 60 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 1pm, then a chance of showers. Temperature falling to around 54 by 5pm. West wind 14 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 64 °F⇓

    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 36. West northwest wind 10 to 14 mph, with gusts as high as 26 mph.

    Low: 36 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 52. West northwest wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 52 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. West wind 6 to 8 mph.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 55. Northwest wind 9 to 15 mph, with gusts as high as 23 mph.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers and thunderstorms before 9am, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 77. South southwest wind 6 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 60. South wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers and possibly a thunderstorm before 1pm, then a chance of showers. Temperature falling to around 54 by 5pm. West wind 14 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 36. West northwest wind 10 to 14 mph, with gusts as high as 26 mph.
Sunday
Mostly sunny, with a high near 52. West northwest wind 10 to 14 mph, with gusts as high as 23 mph.
Sunday Night
Mostly clear, with a low around 36. West wind 6 to 8 mph.
Monday
Sunny, with a high near 55. Northwest wind 9 to 15 mph, with gusts as high as 23 mph.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 50.
Tuesday Night
Partly cloudy, with a low around 35.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 49.
Thursday
Mostly sunny, with a high near 72.
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:
7:46 am CDT Apr 3, 2026
Forecast Valid:
8am CDT Apr 3, 2026-6pm CDT Apr 9, 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