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.

Thunderstorm in Vicinity Heavy Rain Fog/Mist and Windy

45°F

7°C

Humidity 90%
Wind Speed N 33 G 44 mph
Barometer 30.01 in (1016.1 mb)
Dewpoint 42°F (6°C)
Visibility 3.00 mi
Wind Chill35°F (2°C)
Last update 27 Mar 12:53 am CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Rain and possibly a thunderstorm before 4am, then rain likely. Low around 34. Breezy, with a north northeast wind 21 to 23 mph, with gusts as high as 38 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 34 °F

    Rain and
    Breezy

  • Friday

    Friday: A 30 percent chance of rain, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 48. Breezy, with a north wind 17 to 20 mph, with gusts as high as 29 mph.

    High: 48 °F

    Chance Rain
    and Breezy
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 27. North northwest wind 7 to 13 mph, with gusts as high as 20 mph.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 50. North wind 5 to 9 mph becoming south in the afternoon.

    High: 50 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 39. South wind 8 to 11 mph, with gusts as high as 17 mph.

    Low: 39 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 62. South southwest wind 11 to 16 mph, with gusts as high as 24 mph.

    High: 62 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 51. South wind around 11 mph, with gusts as high as 20 mph.

    Low: 51 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 61.

    Low: 61 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Rain and possibly a thunderstorm before 4am, then rain likely. Low around 34. Breezy, with a north northeast wind 21 to 23 mph, with gusts as high as 38 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A 30 percent chance of rain, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 48. Breezy, with a north wind 17 to 20 mph, with gusts as high as 29 mph.
Friday Night
Mostly clear, with a low around 27. North northwest wind 7 to 13 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 50. North wind 5 to 9 mph becoming south in the afternoon.
Saturday Night
Increasing clouds, with a low around 39. South wind 8 to 11 mph, with gusts as high as 17 mph.
Sunday
Mostly cloudy, with a high near 62. South southwest wind 11 to 16 mph, with gusts as high as 24 mph.
Sunday Night
Mostly cloudy, with a low around 51. South wind around 11 mph, with gusts as high as 20 mph.
Monday
Partly sunny, with a high near 76.
Monday Night
A 30 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 61.
Tuesday
A 30 percent chance of rain after 1pm. Partly sunny, with a high near 80. Breezy.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 59.
Wednesday
A chance of rain and thunderstorms. Mostly cloudy, with a high near 74. Breezy.
Wednesday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 51.
Thursday
Rain and thunderstorms likely. Mostly cloudy, with a high near 63.
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:
12:17 am CDT Mar 27, 2026
Forecast Valid:
1am CDT Mar 27, 2026-6pm CDT Apr 2, 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