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

27°F

-3°C

Humidity 66%
Wind Speed S 14 G 20 mph
Barometer 30.16 in (1022.1 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 18 Mar 12:53 am CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: A 50 percent chance of snow, mainly before 4am. Mostly cloudy, with a low around 25. South southeast wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 25 °F

    Chance Snow

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 53. South wind 10 to 14 mph becoming west southwest in the afternoon. Winds could gust as high as 23 mph.

    High: 53 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 37. Light and variable wind becoming south around 6 mph in the evening.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 64. South wind 6 to 9 mph becoming west in the afternoon.

    High: 64 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 38. North northeast wind around 6 mph.

    Low: 38 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 66. East wind 5 to 9 mph becoming west southwest in the afternoon.

    High: 66 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 45. West southwest wind around 8 mph.

    Low: 45 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Overnight
A 50 percent chance of snow, mainly before 4am. Mostly cloudy, with a low around 25. South southeast wind 8 to 13 mph, with gusts as high as 22 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 53. South wind 10 to 14 mph becoming west southwest in the afternoon. Winds could gust as high as 23 mph.
Wednesday Night
Mostly cloudy, with a low around 37. Light and variable wind becoming south around 6 mph in the evening.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 64. South wind 6 to 9 mph becoming west in the afternoon.
Thursday Night
Partly cloudy, with a low around 38. North northeast wind around 6 mph.
Friday
Mostly sunny, with a high near 66. East wind 5 to 9 mph becoming west southwest in the afternoon.
Friday Night
Partly cloudy, with a low around 45. West southwest wind around 8 mph.
Saturday
Mostly sunny, with a high near 74.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Mostly sunny, with a high near 72.
Sunday Night
Partly cloudy, with a low around 35.
Monday
Mostly sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Mostly sunny, with a high near 53.
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:
12:36 am CDT Mar 18, 2026
Forecast Valid:
12am CDT Mar 18, 2026-6pm CDT Mar 24, 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