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

40°F

4°C

Humidity 60%
Wind Speed S 7 mph
Barometer 30.09 in (1019.1 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 14 Feb 12:53 am CST
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Partly cloudy, with a low around 30. South wind 5 to 7 mph.

    Low: 30 °F

    Partly Cloudy

  • Saturday

    Saturday: A 40 percent chance of rain, mainly after noon. Cloudy, with a high near 51. South wind 3 to 6 mph.

    High: 51 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Rain likely. Patchy fog after 2am. Otherwise, cloudy, with a low around 40. East wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Rain Likely
    and Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 56. North northeast wind 5 to 8 mph.

    High: 56 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. Light and variable wind.

    Low: 35 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 57. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 57 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 40. South wind around 7 mph.

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 58.

    High: 58 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 30. South wind 5 to 7 mph.
Saturday
A 40 percent chance of rain, mainly after noon. Cloudy, with a high near 51. South wind 3 to 6 mph.
Saturday Night
Rain likely. Patchy fog after 2am. Otherwise, cloudy, with a low around 40. East wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Patchy fog before 7am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 56. North northeast wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 35. Light and variable wind.
Washington's Birthday
Partly sunny, with a high near 57. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Monday Night
Mostly cloudy, with a low around 40. South wind around 7 mph.
Tuesday
Mostly cloudy, with a high near 58.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 66.
Wednesday Night
Mostly cloudy, with a low around 42.
Thursday
A chance of rain. Partly sunny, with a high near 60.
Thursday Night
A chance of rain. Partly cloudy, with a low around 36.
Friday
Mostly sunny, with a high near 50.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
12:36 am CST Feb 14, 2026
Forecast Valid:
1am CST Feb 14, 2026-6pm CST Feb 20, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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