National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Partly Cloudy

61°F

16°C

Humidity 84%
Wind Speed S 10 mph
Barometer 29.77 in (1007.7 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 15 Nov 4:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 75. South southwest wind 10 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 30 mph.

    High: 75 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Clear, with a low around 37. North northwest wind 9 to 14 mph, with gusts as high as 23 mph.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 54. North northwest wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29. Northwest wind around 5 mph becoming calm in the evening.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 54. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 54 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Rain. Low around 41. East southeast wind 7 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before noon. Mostly cloudy, with a high near 56. East southeast wind 8 to 11 mph, with gusts as high as 17 mph.

    High: 56 °F

    Chance Rain
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain after noon. Partly sunny, with a high near 57.

    High: 57 °F

    Partly Sunny
    then Chance
    Rain

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 75. South southwest wind 10 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 30 mph.
Tonight
Clear, with a low around 37. North northwest wind 9 to 14 mph, with gusts as high as 23 mph.
Sunday
Sunny, with a high near 54. North northwest wind 6 to 9 mph, with gusts as high as 15 mph.
Sunday Night
Mostly clear, with a low around 29. Northwest wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 54. Calm wind becoming southeast 5 to 7 mph in the morning.
Monday Night
Rain. Low around 41. East southeast wind 7 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
A 30 percent chance of rain before noon. Mostly cloudy, with a high near 56. East southeast wind 8 to 11 mph, with gusts as high as 17 mph.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
A 30 percent chance of rain after noon. Partly sunny, with a high near 57.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 43.
Thursday
Rain. Mostly cloudy, with a high near 59.
Thursday Night
Rain likely. Mostly cloudy, with a low around 46.
Friday
A chance of rain. Mostly cloudy, with a high near 61.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
3:36 am CST Nov 15, 2025
Forecast Valid:
5am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
Forecast Discussion
 
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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