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.

Partly Cloudy

68°F

20°C

Humidity 96%
Wind Speed SE 3 mph
Barometer 30.04 in (1016.7 mb)
Dewpoint 67°F (19°C)
Visibility 8.00 mi
Last update 14 Jul 3:53 am CDT
Extended Forecast for

Sullivan IL

Dense Fog Advisory until July 14, 10:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until July 14, 10:00am

    NOW until 10:00am Mon

    Dense Fog Advisory

  • Overnight

    Low: 68 °F

    Areas Dense
    Fog

  • Monday

    Monday: Areas of dense fog before 10am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming east around 5 mph.

    High: 86 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70. Light east wind.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. East southeast wind 3 to 6 mph.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 70. Light southeast wind.

    Low: 70 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Southwest wind 3 to 7 mph.

    High: 88 °F

    Partly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am. Partly cloudy, with a low around 72. South southwest wind around 6 mph. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 88. Chance of precipitation is 60%.

    High: 88 °F

    Mostly Sunny
    then Showers
    Likely

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, mostly cloudy, with a low around 68. Calm wind.
Monday
Areas of dense fog before 10am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming east around 5 mph.
Monday Night
Partly cloudy, with a low around 70. Light east wind.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. East southeast wind 3 to 6 mph.
Tuesday Night
Mostly cloudy, with a low around 70. Light southeast wind.
Wednesday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Southwest wind 3 to 7 mph.
Wednesday Night
A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am. Partly cloudy, with a low around 72. South southwest wind around 6 mph. Chance of precipitation is 30%.
Thursday
Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 88. Chance of precipitation is 60%.
Thursday Night
A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 70.
Friday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 69.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 87.
Saturday Night
Partly cloudy, with a low around 70.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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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:
4:25 am CDT Jul 14, 2025
Forecast Valid:
4am CDT Jul 14, 2025-6pm CDT Jul 20, 2025
 
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