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

35°F

2°C

Humidity 59%
Wind Speed S 13 mph
Barometer 29.92 in (1013.7 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 5 Jan 2:53 am CST
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly clear, with a low around 29. South southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 50. South southwest wind 7 to 10 mph, with gusts as high as 16 mph.

    High: 50 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 40. South southeast wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 55. South southwest wind 9 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 55 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 32. West northwest wind 3 to 7 mph.

    Low: 32 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 55. South wind 3 to 8 mph.

    High: 55 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 42. South wind 7 to 9 mph, with gusts as high as 17 mph.

    Low: 42 °F

    Partly Cloudy

  • Thursday

    Thursday: Rain likely, mainly after noon. Mostly cloudy, with a high near 58. Chance of precipitation is 70%.

    High: 58 °F

    Chance Rain
    then Rain
    Likely

  • Thursday Night

    Thursday Night: Rain. Low around 48. Chance of precipitation is 80%.

    Low: 48 °F

    Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 29. South southwest wind around 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 50. South southwest wind 7 to 10 mph, with gusts as high as 16 mph.
Monday Night
Mostly cloudy, with a low around 40. South southeast wind 7 to 11 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 55. South southwest wind 9 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph.
Tuesday Night
Partly cloudy, with a low around 32. West northwest wind 3 to 7 mph.
Wednesday
Sunny, with a high near 55. South wind 3 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 42. South wind 7 to 9 mph, with gusts as high as 17 mph.
Thursday
Rain likely, mainly after noon. Mostly cloudy, with a high near 58. Chance of precipitation is 70%.
Thursday Night
Rain. Low around 48. Chance of precipitation is 80%.
Friday
Rain likely, mainly after noon. Partly sunny, with a high near 58. Chance of precipitation is 60%.
Friday Night
A chance of rain. Mostly cloudy, with a low around 32.
Saturday
Mostly sunny, with a high near 40.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
Mostly sunny, with a high near 33.
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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:
3:24 am CST Jan 5, 2026
Forecast Valid:
3am CST Jan 5, 2026-6pm CST Jan 11, 2026
 
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