National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

64°F

18°C

Humidity 50%
Wind Speed S 14 G 23 mph
Barometer 30.12 in (1019.5 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 10 Apr 12:53 am CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 58. South southwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 58 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers and thunderstorms before 4pm, then a slight chance of showers. Mostly cloudy, with a high near 66. Southwest wind 10 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 40%.

    High: 66 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 44. East northeast wind 7 to 9 mph, with gusts as high as 16 mph.

    Low: 44 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Increasing clouds, with a high near 66. Southeast wind 8 to 10 mph, with gusts as high as 17 mph.

    High: 66 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 57. Southeast wind 8 to 11 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 79. Breezy, with a south southwest wind 13 to 23 mph, with gusts as high as 38 mph.

    High: 79 °F

    Partly Sunny
    and Breezy

  • Sunday Night

    Sunday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 62. South southwest wind 16 to 18 mph, with gusts as high as 30 mph.

    Low: 62 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a low around 58. South southwest wind around 15 mph, with gusts as high as 25 mph.
Friday
A chance of showers and thunderstorms before 4pm, then a slight chance of showers. Mostly cloudy, with a high near 66. Southwest wind 10 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 40%.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 44. East northeast wind 7 to 9 mph, with gusts as high as 16 mph.
Saturday
Increasing clouds, with a high near 66. Southeast wind 8 to 10 mph, with gusts as high as 17 mph.
Saturday Night
Mostly cloudy, with a low around 57. Southeast wind 8 to 11 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 79. Breezy, with a south southwest wind 13 to 23 mph, with gusts as high as 38 mph.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 62. South southwest wind 16 to 18 mph, with gusts as high as 30 mph.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 30%.
Monday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 65.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64.
Wednesday
A chance of showers. Partly sunny, with a high near 79.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 57.
Thursday
A chance of showers. Partly sunny, with a high near 77.
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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:
1:01 am CDT Apr 10, 2026
Forecast Valid:
1am CDT Apr 10, 2026-6pm CDT Apr 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation