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

52°F

11°C

Humidity 66%
Wind Speed S 10 mph
Barometer 29.94 in (1014.2 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 7 Jan 3:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, increasing clouds, with a low around 41. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 41 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Showers likely, mainly after noon. Patchy fog before 10am. Otherwise, cloudy, with a high near 62. Breezy, with a south southeast wind 10 to 20 mph, with gusts as high as 34 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 62 °F

    Chance
    Showers and
    Patchy Fog
    then Showers
    Likely and
    Breezy

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before 3am, then rain likely. Low around 51. Breezy, with a south southwest wind 14 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 51 °F

    Rain and
    Breezy then
    Rain Likely

  • Friday

    Friday: Partly sunny, with a temperature falling to around 48 by 5pm. Southwest wind 7 to 13 mph becoming north in the afternoon. Winds could gust as high as 22 mph.

    High: 58 °F⇓

    Partly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 38. North northeast wind 5 to 7 mph.

    Low: 38 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: A chance of rain before noon, then a chance of rain and snow. Cloudy, then gradually becoming mostly sunny, with a high near 43. West northwest wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 43 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 21. West wind 14 to 16 mph, with gusts as high as 25 mph.

    Low: 21 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 31.

    High: 31 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 5am. Otherwise, increasing clouds, with a low around 41. South wind 8 to 10 mph, with gusts as high as 21 mph.
Thursday
Showers likely, mainly after noon. Patchy fog before 10am. Otherwise, cloudy, with a high near 62. Breezy, with a south southeast wind 10 to 20 mph, with gusts as high as 34 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Rain and possibly a thunderstorm before 3am, then rain likely. Low around 51. Breezy, with a south southwest wind 14 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Friday
Partly sunny, with a temperature falling to around 48 by 5pm. Southwest wind 7 to 13 mph becoming north in the afternoon. Winds could gust as high as 22 mph.
Friday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 38. North northeast wind 5 to 7 mph.
Saturday
A chance of rain before noon, then a chance of rain and snow. Cloudy, then gradually becoming mostly sunny, with a high near 43. West northwest wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 21. West wind 14 to 16 mph, with gusts as high as 25 mph.
Sunday
Partly sunny, with a high near 31.
Sunday Night
Mostly clear, with a low around 19.
Monday
Mostly sunny, with a high near 41.
Monday Night
Partly cloudy, with a low around 28.
Tuesday
Mostly sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A chance of rain. Mostly cloudy, with a high near 38.
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
3:36 pm CST Jan 7, 2026
Forecast Valid:
4pm CST Jan 7, 2026-6pm CST Jan 14, 2026
 
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Additional Resources

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