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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
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

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 61. Breezy, with a west northwest wind around 21 mph, with gusts as high as 40 mph.

    High: 61 °F

    Partly Sunny
    and Breezy

  • Tonight

    Tonight: Areas of frost after 3am. Otherwise, mostly clear, with a low around 34. North wind 5 to 14 mph, with gusts as high as 24 mph.

    Low: 34 °F

    Mostly Clear
    then Areas
    Frost

  • Monday

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

    High: 59 °F

    Areas Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 45. South wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 75. Southwest wind 11 to 18 mph, with gusts as high as 31 mph.

    High: 75 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58. Southwest wind 10 to 14 mph, with gusts as high as 21 mph.

    Low: 58 °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 57.

    Low: 57 °F

    Mostly Clear

  • Thursday

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

    High: 79 °F

    Sunny then
    Mostly Sunny
    and Breezy

Detailed Forecast

This Afternoon
Partly sunny, with a high near 61. Breezy, with a west northwest wind around 21 mph, with gusts as high as 40 mph.
Tonight
Areas of frost after 3am. Otherwise, mostly clear, with a low around 34. North wind 5 to 14 mph, with gusts as high as 24 mph.
Monday
Areas of frost before 8am. Otherwise, sunny, with a high near 59. Northeast wind around 6 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 45. South wind 7 to 11 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 75. Southwest wind 11 to 18 mph, with gusts as high as 31 mph.
Tuesday Night
Partly cloudy, with a low around 58. Southwest wind 10 to 14 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 57.
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 and possibly a thunderstorm. Mostly cloudy, with a high near 74.
Friday Night
A chance of showers. Partly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
1:26 pm CDT Apr 19, 2026
Forecast Valid:
2pm CDT Apr 19, 2026-6pm CDT Apr 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation