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

42°F

6°C

Humidity 82%
Wind Speed S 7 mph
Barometer 29.91 in (1013.2 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 26 Feb 11:53 pm CST
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly clear, with a low around 34. Southwest wind around 6 mph.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 66. South southwest wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 66 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 35. South southwest wind 7 to 10 mph becoming north northeast after midnight. Winds could gust as high as 20 mph.

    Low: 35 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 54. East northeast wind 7 to 10 mph, with gusts as high as 17 mph.

    High: 54 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25. North northeast wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of snow after noon. Increasing clouds, with a high near 38. Northeast wind 11 to 14 mph, with gusts as high as 21 mph.

    High: 38 °F

    Partly Sunny
    then Chance
    Snow

  • Sunday Night

    Sunday Night: Rain and snow likely. Cloudy, with a low around 23. East northeast wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 23 °F

    Rain/Snow
    Likely

  • Monday

    Monday: Mostly cloudy, with a high near 37.

    High: 37 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 34. Southwest wind around 6 mph.
Friday
Sunny, with a high near 66. South southwest wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 31 mph.
Friday Night
Mostly clear, with a low around 35. South southwest wind 7 to 10 mph becoming north northeast after midnight. Winds could gust as high as 20 mph.
Saturday
Mostly sunny, with a high near 54. East northeast wind 7 to 10 mph, with gusts as high as 17 mph.
Saturday Night
Partly cloudy, with a low around 25. North northeast wind 10 to 13 mph, with gusts as high as 22 mph.
Sunday
A 30 percent chance of snow after noon. Increasing clouds, with a high near 38. Northeast wind 11 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Rain and snow likely. Cloudy, with a low around 23. East northeast wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Mostly cloudy, with a high near 37.
Monday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 25.
Tuesday
A 50 percent chance of rain. Cloudy, with a high near 41.
Tuesday Night
Rain likely. Mostly cloudy, with a low around 32.
Wednesday
Rain likely. Cloudy, with a high near 52.
Wednesday Night
Rain likely. Cloudy, with a low around 43.
Thursday
Rain likely. Mostly cloudy, 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:
12:11 am CST Feb 27, 2026
Forecast Valid:
12am CST Feb 27, 2026-6pm CST Mar 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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