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

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Overcast and Breezy

49°F

9°C

Humidity 74%
Wind Speed NW 21 G 32 mph
Barometer 30.11 in (1019.3 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 16 Oct 7:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: A 40 percent chance of showers after 2pm. Mostly cloudy, with a high near 56. Breezy, with a west northwest wind 17 to 20 mph, with gusts as high as 32 mph.

    High: 56 °F

    Mostly Cloudy
    and Breezy
    then Chance
    Showers

  • Tonight

    Tonight: A 10 percent chance of showers before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. North wind 10 to 16 mph, with gusts as high as 28 mph.

    Low: 36 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Saturday

    Saturday: Patchy frost before 8am. Otherwise, sunny, with a high near 59. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 59 °F

    Patchy Frost
    then Sunny

  • Saturday Night

    Saturday Night: Widespread frost, mainly after 5am. Otherwise, clear, with a low around 33. Light southeast wind.

    Low: 33 °F

    Clear then
    Frost

  • Sunday

    Sunday: Widespread frost before 8am. Otherwise, sunny, with a high near 67. South wind 3 to 7 mph.

    High: 67 °F

    Frost then
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. South southeast wind 3 to 5 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 72. Calm wind becoming south around 5 mph in the afternoon.

    High: 72 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

Detailed Forecast

Today
A 40 percent chance of showers after 2pm. Mostly cloudy, with a high near 56. Breezy, with a west northwest wind 17 to 20 mph, with gusts as high as 32 mph.
Tonight
A 10 percent chance of showers before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. North wind 10 to 16 mph, with gusts as high as 28 mph.
Saturday
Patchy frost before 8am. Otherwise, sunny, with a high near 59. North wind 5 to 7 mph becoming calm in the afternoon.
Saturday Night
Widespread frost, mainly after 5am. Otherwise, clear, with a low around 33. Light southeast wind.
Sunday
Widespread frost before 8am. Otherwise, sunny, with a high near 67. South wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 37. South southeast wind 3 to 5 mph.
Monday
Sunny, with a high near 72. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Clear, with a low around 46.
Thursday
Sunny, with a high near 79.
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:
7:36 am CDT Oct 16, 2026
Forecast Valid:
8am CDT Oct 16, 2026-6pm CDT Oct 22, 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