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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: A slight chance of drizzle after 5am. Patchy fog. Otherwise, mostly cloudy, with a steady temperature around 59. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 59 °F

    Slight Chance
    Drizzle and
    Patchy Fog

  • Friday

    Friday: Patchy fog before 10am. Otherwise, partly sunny, with a high near 63. South southwest wind 9 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 63 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Patchy fog between 9pm and 2am. Otherwise, mostly cloudy, with a low around 42. Northwest wind 5 to 7 mph becoming light and variable.

    Low: 42 °F

    Patchy Fog

  • Saturday

    Saturday: Partly sunny, with a high near 54. Southeast wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 54 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of rain after midnight. Cloudy, with a temperature rising to around 60 by 4am. South southwest wind around 11 mph, with gusts as high as 20 mph.

    Low: 54 °F⇑

    Cloudy then
    Chance Rain

  • Sunday

    Sunday: Rain likely before noon, then showers after noon. High near 65. South southwest wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 65 °F

    Showers

  • Sunday Night

    Sunday Night: Showers likely before 9pm, then rain likely between 9pm and midnight. Mostly cloudy, with a low around 19. Blustery, with a west northwest wind 14 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 19 °F

    Showers
    Likely then
    Mostly Cloudy
    and Blustery

  • Monday

    Monday: Mostly sunny, with a high near 25. Blustery.

    High: 25 °F

    Mostly Sunny
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 15.

    Low: 15 °F

    Mostly Clear

Detailed Forecast

Overnight
A slight chance of drizzle after 5am. Patchy fog. Otherwise, mostly cloudy, with a steady temperature around 59. South wind around 11 mph, with gusts as high as 21 mph.
Friday
Patchy fog before 10am. Otherwise, partly sunny, with a high near 63. South southwest wind 9 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Patchy fog between 9pm and 2am. Otherwise, mostly cloudy, with a low around 42. Northwest wind 5 to 7 mph becoming light and variable.
Saturday
Partly sunny, with a high near 54. Southeast wind 6 to 11 mph, with gusts as high as 18 mph.
Saturday Night
A 40 percent chance of rain after midnight. Cloudy, with a temperature rising to around 60 by 4am. South southwest wind around 11 mph, with gusts as high as 20 mph.
Sunday
Rain likely before noon, then showers after noon. High near 65. South southwest wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Showers likely before 9pm, then rain likely between 9pm and midnight. Mostly cloudy, with a low around 19. Blustery, with a west northwest wind 14 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Mostly sunny, with a high near 25. Blustery.
Monday Night
Mostly clear, with a low around 15.
Tuesday
Sunny, with a high near 30.
Tuesday Night
Partly cloudy, with a low around 21.
Wednesday
Mostly sunny, with a high near 33.
Wednesday Night
Partly cloudy, with a low around 15.
New Year's Day
Mostly sunny, with a high near 29.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
3:16 am CST Dec 26, 2025
Forecast Valid:
4am CST Dec 26, 2025-6pm CST Jan 1, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation