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.

Mostly Cloudy

35°F

2°C

Humidity 76%
Wind Speed Calm
Barometer 30.29 in (1026.4 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 12 Feb 8:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly cloudy, with a high near 48. Southwest wind 5 to 7 mph becoming calm in the afternoon.

    High: 48 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 29. Southeast wind 3 to 6 mph.

    Low: 29 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 52. South wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 52 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 31. South wind 3 to 5 mph.

    Low: 31 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 30 percent chance of rain after noon. Cloudy, with a high near 50. South southeast wind 3 to 7 mph.

    High: 50 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before midnight. Cloudy, with a low around 38. East southeast wind around 7 mph becoming northeast after midnight. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 38 °F

    Rain Likely

  • Sunday

    Sunday: Mostly sunny, with a high near 55. North northeast wind 6 to 9 mph.

    High: 55 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 48. Southwest wind 5 to 7 mph becoming calm in the afternoon.
Tonight
Mostly cloudy, with a low around 29. Southeast wind 3 to 6 mph.
Friday
Sunny, with a high near 52. South wind 6 to 10 mph, with gusts as high as 16 mph.
Friday Night
Increasing clouds, with a low around 31. South wind 3 to 5 mph.
Saturday
A 30 percent chance of rain after noon. Cloudy, with a high near 50. South southeast wind 3 to 7 mph.
Saturday Night
Rain likely, mainly before midnight. Cloudy, with a low around 38. East southeast wind around 7 mph becoming northeast after midnight. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Mostly sunny, with a high near 55. North northeast wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 31.
Washington's Birthday
Mostly sunny, with a high near 56.
Monday Night
Mostly cloudy, with a low around 40.
Tuesday
Cloudy, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 62.
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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:
9:22 am CST Feb 12, 2026
Forecast Valid:
9am CST Feb 12, 2026-6pm CST Feb 18, 2026
 
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