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

64°F

18°C

Humidity 46%
Wind Speed Vrbl 3 mph
Barometer 30.31 in (1026.6 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 11 Apr 1:53 pm CDT
Extended Forecast for

Sullivan IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 68. Southeast wind around 9 mph.

    High: 68 °F

    Partly Sunny

  • Tonight

    Tonight: 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: A 20 percent chance of showers after 3pm. Partly sunny, with a high near 79. 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 37 mph.

    High: 79 °F

    Mostly Sunny
    then Slight
    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Showers likely, then showers and possibly a thunderstorm after 1am. Low around 62. South wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Showers

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. South southwest wind 14 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 50%.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 65. South southwest wind 14 to 16 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. South southwest wind 13 to 18 mph, with gusts as high as 29 mph.

    High: 83 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.

    Low: 65 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. Chance of precipitation is 70%.

    High: 77 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Partly sunny, with a high near 68. Southeast wind around 9 mph.
Tonight
Mostly cloudy, with a low around 56. Southeast wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday
A 20 percent chance of showers after 3pm. Partly sunny, with a high near 79. 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 37 mph.
Sunday Night
Showers likely, then showers and possibly a thunderstorm after 1am. Low around 62. South wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. South southwest wind 14 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 50%.
Monday Night
Mostly cloudy, with a low around 65. South southwest wind 14 to 16 mph, with gusts as high as 25 mph.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. South southwest wind 13 to 18 mph, with gusts as high as 29 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.
Thursday
A chance of showers. Partly sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 58.
Friday
A chance of showers. Mostly sunny, with a high near 81.
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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:
1:44 pm CDT Apr 11, 2026
Forecast Valid:
2pm CDT Apr 11, 2026-6pm CDT Apr 17, 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