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

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

49°F

9°C

Humidity 59%
Wind Speed NW 3 mph
Barometer 30.08 in (1018.8 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 22 Nov 3:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Mostly clear, with a low around 37. West southwest wind 6 to 9 mph, with gusts as high as 15 mph.

    Low: 37 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 55. Northwest wind around 6 mph becoming calm in the afternoon.

    High: 55 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 34. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 34 °F

    Increasing
    Clouds

  • Monday

    Monday: A 30 percent chance of rain after noon. Mostly cloudy, with a high near 55. South southeast wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 55 °F

    Mostly Cloudy
    then Chance
    Rain

  • Monday Night

    Monday Night: Rain. Low around 46. South wind around 7 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Rain

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 59. West southwest wind 6 to 8 mph.

    High: 59 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32. West wind 7 to 13 mph, with gusts as high as 20 mph.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 37. West southwest wind 6 to 9 mph, with gusts as high as 15 mph.
Sunday
Sunny, with a high near 55. Northwest wind around 6 mph becoming calm in the afternoon.
Sunday Night
Increasing clouds, with a low around 34. Calm wind becoming south southeast around 6 mph after midnight.
Monday
A 30 percent chance of rain after noon. Mostly cloudy, with a high near 55. South southeast wind 6 to 10 mph, with gusts as high as 16 mph.
Monday Night
Rain. Low around 46. South wind around 7 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
Mostly cloudy, with a high near 59. West southwest wind 6 to 8 mph.
Tuesday Night
Mostly cloudy, with a low around 32. West wind 7 to 13 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 42.
Wednesday Night
Mostly clear, with a low around 23.
Thanksgiving Day
Sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 39.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Partly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
3:35 pm CST Nov 22, 2025
Forecast Valid:
4pm CST Nov 22, 2025-6pm CST Nov 29, 2025
 
Forecast Discussion
 
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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