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.

Overcast and Breezy

59°F

15°C

Humidity 39%
Wind Speed W 21 G 30 mph
Barometer 30.15 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 19 Apr 4:04 pm CDT
Extended Forecast for

Sullivan IL

Frost Advisory April 20, 01:00am until April 20, 08:00am
Click here for hazard details and duration
Frost Advisory

  • Tonight

    Tonight: Areas of frost after 3am. Otherwise, mostly clear, with a low around 34. Northwest wind 11 to 16 mph becoming north 5 to 10 mph after midnight. Winds could gust as high as 28 mph.

    Low: 34 °F

    Partly Cloudy
    then Areas
    Frost

  • Monday

    Monday: Areas of frost before 8am. Otherwise, sunny, with a high near 59. Light and variable wind becoming east around 6 mph in the afternoon.

    High: 59 °F

    Areas Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 45. South wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 75. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 75 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 57. Southwest wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. West southwest wind around 10 mph, with gusts as high as 16 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56. South wind around 9 mph, with gusts as high as 15 mph.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 79. Breezy.

    High: 79 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Showers likely after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.

    Low: 61 °F

    Mostly Cloudy
    then Showers
    Likely

Detailed Forecast

Tonight
Areas of frost after 3am. Otherwise, mostly clear, with a low around 34. Northwest wind 11 to 16 mph becoming north 5 to 10 mph after midnight. Winds could gust as high as 28 mph.
Monday
Areas of frost before 8am. Otherwise, sunny, with a high near 59. Light and variable wind becoming east around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 45. South wind 6 to 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 75. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Tuesday Night
Partly cloudy, with a low around 57. Southwest wind 10 to 13 mph, with gusts as high as 21 mph.
Wednesday
Mostly sunny, with a high near 77. West southwest wind around 10 mph, with gusts as high as 16 mph.
Wednesday Night
Mostly clear, with a low around 56. South wind around 9 mph, with gusts as high as 15 mph.
Thursday
Sunny, with a high near 79. Breezy.
Thursday Night
Showers likely after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 68.
Saturday Night
A chance of showers. Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 67.
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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:
5:31 pm CDT Apr 19, 2026
Forecast Valid:
6pm CDT Apr 19, 2026-6pm CDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation