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.

Fair and Breezy

35°F

2°C

Humidity 78%
Wind Speed N 22 G 39 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 22 Mar 11:53 pm CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly clear, with a low around 30. North wind 14 to 18 mph, with gusts as high as 29 mph.

    Low: 30 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 50. North wind 10 to 13 mph, with gusts as high as 21 mph.

    High: 50 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31. Northeast wind around 7 mph.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56. South southeast wind 6 to 8 mph.

    High: 56 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. Southeast wind around 6 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 69. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 69 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 54. South wind around 10 mph, with gusts as high as 18 mph.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Rain likely and possibly a thunderstorm before 1am, then a chance of rain. Mostly cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Rain Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 30. North wind 14 to 18 mph, with gusts as high as 29 mph.
Monday
Mostly sunny, with a high near 50. North wind 10 to 13 mph, with gusts as high as 21 mph.
Monday Night
Mostly cloudy, with a low around 31. Northeast wind around 7 mph.
Tuesday
Mostly sunny, with a high near 56. South southeast wind 6 to 8 mph.
Tuesday Night
Mostly cloudy, with a low around 38. Southeast wind around 6 mph.
Wednesday
Partly sunny, with a high near 69. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Wednesday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 54. South wind around 10 mph, with gusts as high as 18 mph.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Rain likely and possibly a thunderstorm before 1am, then a chance of rain. Mostly cloudy, with a low around 37. Chance of precipitation is 70%.
Friday
A chance of rain and snow before 1pm. Partly sunny, with a high near 47. Chance of precipitation is 30%.
Friday Night
Mostly clear, with a low around 27.
Saturday
Sunny, with a high near 53.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
Partly sunny, with a high near 59.
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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:
11:36 pm CDT Mar 22, 2026
Forecast Valid:
12am CDT Mar 23, 2026-6pm CDT Mar 29, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation