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.

Partly Cloudy

72°F

22°C

Humidity 68%
Wind Speed S 10 mph
Barometer 29.95 in (1013.8 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 17 Apr 10:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 82. South wind 14 to 18 mph, with gusts as high as 30 mph.

    High: 82 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before midnight, then showers and possibly a thunderstorm between midnight and 4am, then showers after 4am. Low around 48. South wind 14 to 16 mph becoming west southwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 48 °F

    Showers
    Likely then
    Showers

  • Saturday

    Saturday: Showers likely, mainly before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 57. Northwest wind 15 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: 57 °F

    Showers
    Likely then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 7 to 14 mph, with gusts as high as 21 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 7 to 16 mph, with gusts as high as 26 mph.

    High: 59 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 6 to 9 mph becoming east after midnight. Winds could gust as high as 15 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Monday

    Monday: Patchy frost before 8am. Otherwise, sunny, with a high near 63. East wind 6 to 8 mph becoming south in the afternoon.

    High: 63 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 82. South wind 14 to 18 mph, with gusts as high as 30 mph.
Tonight
Showers and thunderstorms likely before midnight, then showers and possibly a thunderstorm between midnight and 4am, then showers after 4am. Low around 48. South wind 14 to 16 mph becoming west southwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers likely, mainly before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 57. Northwest wind 15 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
Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 7 to 14 mph, with gusts as high as 21 mph.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 7 to 16 mph, with gusts as high as 26 mph.
Sunday Night
Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 6 to 9 mph becoming east after midnight. Winds could gust as high as 15 mph.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 63. East wind 6 to 8 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 48.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 56.
Thursday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
11:16 am CDT Apr 17, 2026
Forecast Valid:
11am CDT Apr 17, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation