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

54°F

12°C

Humidity 97%
Wind Speed Calm
Barometer 30.12 in (1019.7 mb)
Dewpoint 53°F (12°C)
Visibility 8.00 mi
Last update 25 May 5:53 am CDT
Extended Forecast for

5 Miles SSW Sullivan IL

  • Memorial Day

    Memorial Day: Patchy fog before 9am. Otherwise, sunny, with a high near 79. Calm wind becoming east around 6 mph in the morning.

    High: 79 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 57. East wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 80. East southeast wind 3 to 5 mph.

    High: 80 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 65. East wind 3 to 5 mph.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. East wind 3 to 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 62. East wind 3 to 5 mph.

    Low: 62 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82. East wind 5 to 8 mph.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

Detailed Forecast

Memorial Day
Patchy fog before 9am. Otherwise, sunny, with a high near 79. Calm wind becoming east around 6 mph in the morning.
Tonight
Partly cloudy, with a low around 57. East wind around 5 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 80. East southeast wind 3 to 5 mph.
Tuesday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 65. East wind 3 to 5 mph.
Wednesday
Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. East wind 3 to 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Partly cloudy, with a low around 62. East wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 82. East wind 5 to 8 mph.
Thursday Night
Partly cloudy, with a low around 62.
Friday
Partly sunny, with a high near 77.
Friday Night
Mostly cloudy, with a low around 60.
Saturday
Partly sunny, with a high near 74.
Saturday Night
Mostly cloudy, with a low around 57.
Sunday
Mostly sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSW Sullivan IL
 39.54°N 88.64°W (Elev. 600 ft)
Last Update:
4:37 am CDT May 25, 2026
Forecast Valid:
6am CDT May 25, 2026-6pm CDT May 31, 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