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.

Fair

44°F

7°C

Humidity 53%
Wind Speed SW 5 mph
Barometer 30.06 in (1018.3 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 14 Feb 9:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: A 50 percent chance of rain, mainly after 2pm. Cloudy, with a high near 51. South wind 3 to 6 mph.

    High: 51 °F

    Cloudy then
    Chance Rain

  • Tonight

    Tonight: Rain. Patchy fog after 2am. Low around 42. South wind 5 to 8 mph becoming east after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 42 °F

    Rain and
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 56. East wind 5 to 8 mph becoming light and variable in the afternoon. Winds could gust as high as 16 mph.

    High: 56 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. Light and variable wind.

    Low: 35 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 58. South wind 5 to 10 mph, with gusts as high as 18 mph.

    High: 58 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. South wind around 8 mph, with gusts as high as 15 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 59. South wind 8 to 16 mph, with gusts as high as 26 mph.

    High: 59 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 65. Breezy.

    High: 65 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Today
A 50 percent chance of rain, mainly after 2pm. Cloudy, with a high near 51. South wind 3 to 6 mph.
Tonight
Rain. Patchy fog after 2am. Low around 42. South wind 5 to 8 mph becoming east after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
Patchy fog before 7am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 56. East wind 5 to 8 mph becoming light and variable in the afternoon. Winds could gust as high as 16 mph.
Sunday Night
Mostly clear, with a low around 35. Light and variable wind.
Washington's Birthday
Partly sunny, with a high near 58. South wind 5 to 10 mph, with gusts as high as 18 mph.
Monday Night
Mostly cloudy, with a low around 41. South wind around 8 mph, with gusts as high as 15 mph.
Tuesday
Mostly cloudy, with a high near 59. South wind 8 to 16 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Mostly sunny, with a high near 65. Breezy.
Wednesday Night
Partly cloudy, with a low around 39.
Thursday
A chance of rain. Partly sunny, with a high near 60.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 37.
Friday
Partly sunny, with a high near 51.
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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:
9:36 am CST Feb 14, 2026
Forecast Valid:
10am CST Feb 14, 2026-6pm CST Feb 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation