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.

A Few Clouds

43°F

6°C

Humidity 89%
Wind Speed NW 12 mph
Barometer 29.87 in (1011.5 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 12 Nov 7:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: A slight chance of rain between 9am and 4pm. Mostly cloudy, with a high near 47. Breezy, with a north northwest wind 10 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.

    High: 47 °F

    Slight Chance
    Rain and
    Breezy

  • Tonight

    Tonight: A 20 percent chance of snow after 5am. Mostly cloudy, with a low around 31. North northwest wind 11 to 16 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Friday

    Friday: A slight chance of snow before 10am, then a slight chance of rain between 10am and 11am. Partly sunny, with a high near 43. North northwest wind 10 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 43 °F

    Slight Chance
    Rain/Snow
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 25. North northwest wind 5 to 8 mph, with gusts as high as 15 mph.

    Low: 25 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 46. Northwest wind 3 to 7 mph.

    High: 46 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 23. Calm wind.

    Low: 23 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 49. Calm wind.

    High: 49 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

Detailed Forecast

Today
A slight chance of rain between 9am and 4pm. Mostly cloudy, with a high near 47. Breezy, with a north northwest wind 10 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.
Tonight
A 20 percent chance of snow after 5am. Mostly cloudy, with a low around 31. North northwest wind 11 to 16 mph, with gusts as high as 25 mph.
Friday
A slight chance of snow before 10am, then a slight chance of rain between 10am and 11am. Partly sunny, with a high near 43. North northwest wind 10 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 25. North northwest wind 5 to 8 mph, with gusts as high as 15 mph.
Saturday
Sunny, with a high near 46. Northwest wind 3 to 7 mph.
Saturday Night
Clear, with a low around 23. Calm wind.
Sunday
Sunny, with a high near 49. Calm wind.
Sunday Night
Mostly clear, with a low around 25.
Monday
Sunny, with a high near 51.
Monday Night
Clear, with a low around 26.
Tuesday
Sunny, with a high near 53.
Tuesday Night
Clear, with a low around 27.
Wednesday
Sunny, with a high near 57.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.58°W (Elev. 669 ft)
Last Update:
8:46 am CST Nov 12, 2026
Forecast Valid:
8am CST Nov 12, 2026-6pm CST Nov 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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