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.

Overcast

21°F

-6°C

Humidity 88%
Wind Speed S 9 mph
Barometer 30.07 in (1019.5 mb)
Dewpoint 18°F (-8°C)
Visibility 9.00 mi
Wind Chill11°F (-12°C)
Last update 2 Dec 11:53 pm CST
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Areas of fog. Otherwise, mostly cloudy, with a low around 17. South wind around 8 mph.

    Low: 17 °F

    Areas Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, increasing clouds, with a high near 34. South wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 16 mph.

    High: 34 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Scattered snow showers, mainly before midnight. Mostly cloudy, with a low around 7. Wind chill values between -3 and 2. North wind 6 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 30%.

    Low: 7 °F

    Scattered
    Snow Showers

  • Thursday

    Thursday: Sunny, with a high near 15. Wind chill values between -4 and 6. North wind 5 to 8 mph becoming calm in the afternoon.

    High: 15 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 1. Calm wind becoming south around 5 mph after midnight.

    Low: 1 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 28. South southwest wind around 6 mph.

    High: 28 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 15. West southwest wind around 6 mph.

    Low: 15 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Areas of fog. Otherwise, mostly cloudy, with a low around 17. South wind around 8 mph.
Wednesday
Patchy fog before 9am. Otherwise, increasing clouds, with a high near 34. South wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 16 mph.
Wednesday Night
Scattered snow showers, mainly before midnight. Mostly cloudy, with a low around 7. Wind chill values between -3 and 2. North wind 6 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 30%.
Thursday
Sunny, with a high near 15. Wind chill values between -4 and 6. North wind 5 to 8 mph becoming calm in the afternoon.
Thursday Night
Partly cloudy, with a low around 1. Calm wind becoming south around 5 mph after midnight.
Friday
Mostly sunny, with a high near 28. South southwest wind around 6 mph.
Friday Night
Mostly cloudy, with a low around 15. West southwest wind around 6 mph.
Saturday
Partly sunny, with a high near 30.
Saturday Night
Mostly cloudy, with a low around 18.
Sunday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 29.
Sunday Night
Mostly cloudy, with a low around 11.
Monday
Partly sunny, with a high near 27.
Monday Night
Mostly cloudy, with a low around 16.
Tuesday
Mostly cloudy, with a high near 33.
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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:
11:36 pm CST Dec 2, 2025
Forecast Valid:
12am CST Dec 3, 2025-6pm CST Dec 9, 2025
 
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