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

71°F

22°C

Humidity 39%
Wind Speed S 9 mph
Barometer 30.15 in (1020.6 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 9 Apr 6:53 pm CDT
Extended Forecast for

Sullivan IL

  • Tonight

    Tonight: A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 57. South wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 57 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: Showers and thunderstorms likely before 4pm, then a chance of showers. Cloudy, with a high near 65. Southwest wind 10 to 14 mph becoming north in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 65 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 10 percent chance of showers before 7pm. Partly cloudy, with a low around 42. East northeast wind around 8 mph.

    Low: 42 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 66. Southeast wind around 9 mph, with gusts as high as 15 mph.

    High: 66 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 56. Southeast wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 77. Breezy, with a south southwest wind 11 to 16 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 36 mph.

    High: 77 °F

    Partly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Sunday Night

    Sunday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 61. South southwest wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 61 °F

    Chance
    Showers then
    Showers
    Likely

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 57. South wind 10 to 14 mph, with gusts as high as 24 mph.
Friday
Showers and thunderstorms likely before 4pm, then a chance of showers. Cloudy, with a high near 65. Southwest wind 10 to 14 mph becoming north in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
A 10 percent chance of showers before 7pm. Partly cloudy, with a low around 42. East northeast wind around 8 mph.
Saturday
Partly sunny, with a high near 66. Southeast wind around 9 mph, with gusts as high as 15 mph.
Saturday Night
Mostly cloudy, with a low around 56. Southeast wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday
Mostly cloudy, with a high near 77. Breezy, with a south southwest wind 11 to 16 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 36 mph.
Sunday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 61. South southwest wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.
Monday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 65.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63.
Wednesday
A chance of showers. Mostly cloudy, with a high near 78. Breezy.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 55.
Thursday
A chance of showers. Mostly sunny, with a high near 76.
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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:
6:36 pm CDT Apr 9, 2026
Forecast Valid:
7pm CDT Apr 9, 2026-6pm CDT Apr 16, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation