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

28°F

-2°C

Humidity 78%
Wind Speed N 20 G 33 mph
Barometer 30.19 in (1022.9 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 28 Feb 11:53 pm CST
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: Partly cloudy, with a low around 26. North northeast wind 13 to 15 mph, with gusts as high as 24 mph.

    Low: 26 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 41. Northeast wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 41 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of snow and sleet before 1am, then snow likely between 1am and 4am, then a chance of snow and freezing rain after 4am. Mostly cloudy, with a low around 28. East wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. New snow and sleet accumulation of less than a half inch possible.

    Low: 28 °F

    Chance Snow
    then Wintry
    Mix Likely

  • Monday

    Monday: A chance of snow and freezing rain before 9am, then a chance of rain between 9am and noon. Cloudy, with a high near 41. East southeast wind 9 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 40%.

    High: 41 °F

    Chance Wintry
    Mix then
    Cloudy

  • Monday Night

    Monday Night: Rain, mainly after midnight. Low around 36. Southeast wind around 9 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 36 °F

    Chance Rain
    then Rain

  • Tuesday

    Tuesday: Rain. High near 57. South southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 57 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 47. Southwest wind 8 to 10 mph becoming east in the evening. Winds could gust as high as 16 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Rain

  • Wednesday

    Wednesday: Rain, with thunderstorms also possible after noon. High near 62. Chance of precipitation is 80%.

    High: 62 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.

    Low: 49 °F

    Rain Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 26. North northeast wind 13 to 15 mph, with gusts as high as 24 mph.
Sunday
Partly sunny, with a high near 41. Northeast wind 10 to 14 mph, with gusts as high as 21 mph.
Sunday Night
A chance of snow and sleet before 1am, then snow likely between 1am and 4am, then a chance of snow and freezing rain after 4am. Mostly cloudy, with a low around 28. East wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. New snow and sleet accumulation of less than a half inch possible.
Monday
A chance of snow and freezing rain before 9am, then a chance of rain between 9am and noon. Cloudy, with a high near 41. East southeast wind 9 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 40%.
Monday Night
Rain, mainly after midnight. Low around 36. Southeast wind around 9 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
Rain. High near 57. South southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
Rain and possibly a thunderstorm. Low around 47. Southwest wind 8 to 10 mph becoming east in the evening. Winds could gust as high as 16 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Rain, with thunderstorms also possible after noon. High near 62. Chance of precipitation is 80%.
Wednesday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.
Thursday
Rain likely. Mostly cloudy, with a high near 65. Chance of precipitation is 70%.
Thursday Night
A chance of rain and thunderstorms. Mostly cloudy, with a low around 52.
Friday
Rain likely. Cloudy, with a high near 68.
Friday Night
Rain likely. Mostly cloudy, with a low around 51.
Saturday
Rain likely. Mostly cloudy, with a high near 62.
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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:
10:06 pm CST Feb 28, 2026
Forecast Valid:
11pm CST Feb 28, 2026-6pm CST Mar 7, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation