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.

Fair

37°F

3°C

Humidity 76%
Wind Speed NW 9 mph
Barometer 29.90 in (1012.7 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 16 Nov 5:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Sunny, with a high near 54. North northwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 28. Northwest wind 3 to 6 mph.

    Low: 28 °F

    Mostly Clear

  • Monday

    Monday: Increasing clouds, with a high near 56. Calm wind becoming south southeast 5 to 7 mph in the afternoon.

    High: 56 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 42. Southeast wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 42 °F

    Rain Likely

  • Tuesday

    Tuesday: A 50 percent chance of rain. Mostly cloudy, with a high near 59. Southeast wind 7 to 11 mph, with gusts as high as 17 mph.

    High: 59 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 44. East northeast wind around 6 mph.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 62. North northeast wind around 6 mph becoming west northwest in the afternoon.

    High: 62 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain. High near 63. Chance of precipitation is 80%.

    High: 63 °F

    Rain

Detailed Forecast

Today
Sunny, with a high near 54. North northwest wind 7 to 13 mph, with gusts as high as 18 mph.
Tonight
Mostly clear, with a low around 28. Northwest wind 3 to 6 mph.
Monday
Increasing clouds, with a high near 56. Calm wind becoming south southeast 5 to 7 mph in the afternoon.
Monday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 42. Southeast wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 59. Southeast wind 7 to 11 mph, with gusts as high as 17 mph.
Tuesday Night
Mostly cloudy, with a low around 44. East northeast wind around 6 mph.
Wednesday
Mostly cloudy, with a high near 62. North northeast wind around 6 mph becoming west northwest in the afternoon.
Wednesday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 45.
Thursday
Rain. High near 63. Chance of precipitation is 80%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Friday
Rain likely. Partly sunny, with a high near 62.
Friday Night
A chance of rain. Mostly cloudy, with a low around 38.
Saturday
Partly sunny, with a high near 51.
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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:
6:07 am CST Nov 16, 2025
Forecast Valid:
6am CST Nov 16, 2025-6pm CST Nov 22, 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