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

39°F

4°C

Humidity 65%
Wind Speed N 6 mph
Barometer 30.11 in (1019.9 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 14 Mar 2:53 am CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 32. North northeast wind around 6 mph.

    Low: 32 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 53. East wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 53 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 46. East southeast wind 11 to 16 mph, with gusts as high as 28 mph.

    Low: 46 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain likely after 1pm. Mostly cloudy, with a high near 66. Windy, with a south wind 20 to 30 mph, with gusts as high as 49 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 66 °F

    Mostly Cloudy
    and Breezy
    then Rain
    Likely and
    Windy

  • Sunday Night

    Sunday Night: Rain before 1am, then a chance of snow. Patchy blowing snow after 2am. Low around 21. Blustery, with a south wind 22 to 25 mph becoming west northwest after midnight. Winds could gust as high as 38 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

    Low: 21 °F

    Rain and
    Breezy then
    Rain/Snow and
    Patchy
    Blowing Snow

  • Monday

    Monday: A 40 percent chance of snow before 1pm. Cloudy, with a high near 25. Blustery, with a west northwest wind around 26 mph, with gusts as high as 41 mph.

    High: 25 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 10. Blustery, with a west northwest wind 14 to 20 mph, with gusts as high as 31 mph.

    Low: 10 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 22.

    Low: 22 °F

    Chance Snow

Detailed Forecast

Overnight
Mostly cloudy, with a low around 32. North northeast wind around 6 mph.
Saturday
Partly sunny, with a high near 53. East wind 6 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Partly cloudy, with a low around 46. East southeast wind 11 to 16 mph, with gusts as high as 28 mph.
Sunday
Rain likely after 1pm. Mostly cloudy, with a high near 66. Windy, with a south wind 20 to 30 mph, with gusts as high as 49 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Rain before 1am, then a chance of snow. Patchy blowing snow after 2am. Low around 21. Blustery, with a south wind 22 to 25 mph becoming west northwest after midnight. Winds could gust as high as 38 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Monday
A 40 percent chance of snow before 1pm. Cloudy, with a high near 25. Blustery, with a west northwest wind around 26 mph, with gusts as high as 41 mph.
Monday Night
Mostly cloudy, with a low around 10. Blustery, with a west northwest wind 14 to 20 mph, with gusts as high as 31 mph.
Tuesday
Mostly sunny, with a high near 28.
Tuesday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 22.
Wednesday
Partly sunny, with a high near 54.
Wednesday Night
Mostly clear, with a low around 34.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 43.
Friday
Mostly sunny, with a high near 63.
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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:
3:36 am CDT Mar 14, 2026
Forecast Valid:
3am CDT Mar 14, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation