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

38°F

3°C

Humidity 68%
Wind Speed N 5 mph
Barometer 30.03 in (1017.0 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 28 Feb 4:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Partly sunny, with a high near 56. North northeast wind 6 to 11 mph becoming east in the afternoon.

    High: 56 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 26. North northeast wind 7 to 14 mph, with gusts as high as 21 mph.

    Low: 26 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 39. North northeast wind 10 to 15 mph, with gusts as high as 22 mph.

    High: 39 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Snow likely, mainly after midnight. Cloudy, with a low around 26. East northeast wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

    Low: 26 °F

    Snow Likely

  • Monday

    Monday: Mostly cloudy, with a high near 40. East southeast wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 40 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Rain, mainly after midnight. Low around 34. Southeast wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 34 °F

    Chance Rain
    then Rain

  • Tuesday

    Tuesday: Rain. High near 52. South wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 52 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain. Low around 42. Chance of precipitation is 80%.

    Low: 42 °F

    Rain

  • Wednesday

    Wednesday: Rain likely and possibly a thunderstorm. Cloudy, with a high near 59. Chance of precipitation is 70%.

    High: 59 °F

    Rain Likely

Detailed Forecast

Today
Partly sunny, with a high near 56. North northeast wind 6 to 11 mph becoming east in the afternoon.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 26. North northeast wind 7 to 14 mph, with gusts as high as 21 mph.
Sunday
Mostly cloudy, with a high near 39. North northeast wind 10 to 15 mph, with gusts as high as 22 mph.
Sunday Night
Snow likely, mainly after midnight. Cloudy, with a low around 26. East northeast wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.
Monday
Mostly cloudy, with a high near 40. East southeast wind 8 to 13 mph, with gusts as high as 20 mph.
Monday Night
Rain, mainly after midnight. Low around 34. Southeast wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
Rain. High near 52. South wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday Night
Rain. Low around 42. Chance of precipitation is 80%.
Wednesday
Rain likely and possibly a thunderstorm. Cloudy, with a high near 59. Chance of precipitation is 70%.
Wednesday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.
Thursday
A chance of rain. Mostly cloudy, with a high near 63.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 51.
Friday
Rain likely. Cloudy, with a high near 67.
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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:
3:06 am CST Feb 28, 2026
Forecast Valid:
5am CST Feb 28, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation