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

59°F

15°C

Humidity 44%
Wind Speed S 13 mph
Barometer 30.06 in (1017.6 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 30 Mar 12:53 am CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 53. South southwest wind 11 to 13 mph, with gusts as high as 22 mph.

    Low: 53 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 77. South southwest wind 14 to 18 mph, with gusts as high as 29 mph.

    High: 77 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62. South southwest wind 14 to 17 mph, with gusts as high as 28 mph.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Breezy, with a south southwest wind 17 to 23 mph, with gusts as high as 39 mph.

    High: 81 °F

    Breezy.
    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, then showers after 1am. Low around 50. South southwest wind 13 to 15 mph becoming north after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 50 °F

    T-storms

  • Wednesday

    Wednesday: Showers, with thunderstorms also possible after 1pm. High near 59. Northeast wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 59 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm, then showers after 1am. Low around 49. East northeast wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 49 °F

    Showers

  • Thursday

    Thursday: Showers. High near 64. Chance of precipitation is 80%.

    High: 64 °F

    Showers

  • Thursday Night

    Thursday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 53. South southwest wind 11 to 13 mph, with gusts as high as 22 mph.
Monday
Mostly sunny, with a high near 77. South southwest wind 14 to 18 mph, with gusts as high as 29 mph.
Monday Night
Partly cloudy, with a low around 62. South southwest wind 14 to 17 mph, with gusts as high as 28 mph.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Breezy, with a south southwest wind 17 to 23 mph, with gusts as high as 39 mph.
Tuesday Night
Showers and thunderstorms likely, then showers after 1am. Low around 50. South southwest wind 13 to 15 mph becoming north after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Showers, with thunderstorms also possible after 1pm. High near 59. Northeast wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers likely and possibly a thunderstorm, then showers after 1am. Low around 49. East northeast wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday
Showers. High near 64. Chance of precipitation is 80%.
Thursday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 69.
Friday Night
A chance of showers. Mostly cloudy, with a low around 53.
Saturday
Showers likely. Mostly cloudy, with a high near 70.
Saturday Night
Showers likely. Mostly cloudy, with a low around 47.
Sunday
A chance of showers. Partly sunny, with a high near 59.
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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:
5:52 pm CDT Mar 29, 2026
Forecast Valid:
1am CDT Mar 30, 2026-6pm CDT Apr 5, 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