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

70°F

21°C

Humidity 76%
Wind Speed S 14 G 22 mph
Barometer 29.85 in (1010.3 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 15 Apr 6:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Showers and thunderstorms before 4am, then a chance of showers. Low around 61. South southwest wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 61 °F

    T-storms

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 78. West southwest wind 11 to 14 mph, with gusts as high as 22 mph.

    High: 78 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 54. West wind around 6 mph becoming light and variable.

    Low: 54 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 82. South wind 6 to 16 mph, with gusts as high as 26 mph.

    High: 82 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, then showers and possibly a thunderstorm after 7pm. Low around 51. South wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 51 °F

    Showers

  • Saturday

    Saturday: Showers likely, mainly before 1pm. Partly sunny, with a high near 63. West northwest wind 14 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 37. West northwest wind 9 to 14 mph, with gusts as high as 22 mph.

    Low: 37 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms before 4am, then a chance of showers. Low around 61. South southwest wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 78. West southwest wind 11 to 14 mph, with gusts as high as 22 mph.
Thursday Night
Mostly clear, with a low around 54. West wind around 6 mph becoming light and variable.
Friday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 82. South wind 6 to 16 mph, with gusts as high as 26 mph.
Friday Night
Showers likely, then showers and possibly a thunderstorm after 7pm. Low around 51. South wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers likely, mainly before 1pm. Partly sunny, with a high near 63. West northwest wind 14 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Partly cloudy, with a low around 37. West northwest wind 9 to 14 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 58.
Sunday Night
Mostly clear, with a low around 37.
Monday
Sunny, with a high near 66.
Monday Night
Mostly clear, with a low around 49.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
Mostly sunny, with a high near 74.
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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:
7:36 pm CDT Apr 15, 2026
Forecast Valid:
7pm CDT Apr 15, 2026-6pm CDT Apr 22, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation