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.

Fog/Mist

55°F

13°C

Humidity 100%
Wind Speed N 9 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 55°F (13°C)
Visibility 0.75 mi
Wind Chill53°F (12°C)
Last update 25 Dec 6:53 am CST
Extended Forecast for

Sullivan IL

Dense Fog Advisory December 25, 07:50am until December 25, 10:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory December 25, 07:50am until December 25, 10:00am

    NOW until 10:00am Thu

    Dense Fog Advisory

  • Christmas Day

    High: 57 °F

    Slight Chance
    Drizzle and
    Dense Fog
    then Cloudy

  • Tonight

    Tonight: A slight chance of drizzle after 7pm. Patchy fog. Otherwise, cloudy, with a low around 52. East wind 6 to 10 mph becoming south after midnight. Winds could gust as high as 18 mph.

    Low: 52 °F

    Slight Chance
    Drizzle and
    Patchy Fog

  • Friday

    Friday: Patchy fog before noon. Otherwise, partly sunny, with a high near 64. South wind 7 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 64 °F

    Patchy Fog
    then Partly
    Sunny

  • Friday Night

    Friday Night: Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 42. Northwest wind around 6 mph becoming calm in the evening.

    Low: 42 °F

    Partly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 61. Southeast wind 5 to 10 mph, with gusts as high as 16 mph.

    High: 61 °F

    Patchy Fog
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 53. Southeast wind around 10 mph becoming south southwest after midnight. Winds could gust as high as 17 mph.

    Low: 53 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain likely, mainly after noon. Cloudy, with a high near 63. South southwest wind 9 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 63 °F

    Rain Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 18. Blustery.

    Low: 18 °F

    Chance Rain
    then Mostly
    Cloudy and
    Blustery

Detailed Forecast

Christmas Day
A slight chance of drizzle before noon. Widespread dense fog, mainly before 10am. Otherwise, cloudy, with a high near 57. East northeast wind 5 to 8 mph.
Tonight
A slight chance of drizzle after 7pm. Patchy fog. Otherwise, cloudy, with a low around 52. East wind 6 to 10 mph becoming south after midnight. Winds could gust as high as 18 mph.
Friday
Patchy fog before noon. Otherwise, partly sunny, with a high near 64. South wind 7 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.
Friday Night
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 42. Northwest wind around 6 mph becoming calm in the evening.
Saturday
Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 61. Southeast wind 5 to 10 mph, with gusts as high as 16 mph.
Saturday Night
Mostly cloudy, with a low around 53. Southeast wind around 10 mph becoming south southwest after midnight. Winds could gust as high as 17 mph.
Sunday
Rain likely, mainly after noon. Cloudy, with a high near 63. South southwest wind 9 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 18. Blustery.
Monday
Sunny, with a high near 24. Blustery.
Monday Night
Mostly clear, with a low around 13.
Tuesday
Mostly sunny, with a high near 29.
Tuesday Night
Partly cloudy, with a low around 19.
Wednesday
Partly sunny, with a high near 35.
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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 am CST Dec 25, 2025
Forecast Valid:
7am CST Dec 25, 2025-6pm CST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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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