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

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

58°F

14°C

Humidity 46%
Wind Speed S 9 mph
Barometer 30.06 in (1017.6 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 30 Mar 1:53 am CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 53. South southwest wind around 13 mph, with gusts as high as 23 mph.

    Low: 53 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 76. Breezy, with a south southwest wind 14 to 20 mph, with gusts as high as 31 mph.

    High: 76 °F

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. South southwest wind 15 to 17 mph, with gusts as high as 29 mph.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Breezy, with a south southwest wind 17 to 24 mph, with gusts as high as 39 mph.

    High: 80 °F

    Breezy.
    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 51. South southwest wind 11 to 16 mph becoming north after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 51 °F

    Rain

  • Wednesday

    Wednesday: Rain likely, then rain and possibly a thunderstorm after 1pm. High near 65. East northeast wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 65 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain and possibly a thunderstorm. Low around 56. East wind 11 to 14 mph becoming south after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 56 °F

    Rain

  • Thursday

    Thursday: Rain and possibly a thunderstorm. High near 73. Breezy. Chance of precipitation is 80%.

    High: 73 °F

    Rain and
    Breezy

  • Thursday Night

    Thursday Night: Rain. Low around 56. Chance of precipitation is 80%.

    Low: 56 °F

    Rain

Detailed Forecast

Overnight
Mostly cloudy, with a low around 53. South southwest wind around 13 mph, with gusts as high as 23 mph.
Monday
Mostly sunny, with a high near 76. Breezy, with a south southwest wind 14 to 20 mph, with gusts as high as 31 mph.
Monday Night
Partly cloudy, with a low around 61. South southwest wind 15 to 17 mph, with gusts as high as 29 mph.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Breezy, with a south southwest wind 17 to 24 mph, with gusts as high as 39 mph.
Tuesday Night
Rain and possibly a thunderstorm. Low around 51. South southwest wind 11 to 16 mph becoming north after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Rain likely, then rain and possibly a thunderstorm after 1pm. High near 65. East northeast wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Rain and possibly a thunderstorm. Low around 56. East wind 11 to 14 mph becoming south after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Rain and possibly a thunderstorm. High near 73. Breezy. Chance of precipitation is 80%.
Thursday Night
Rain. Low around 56. Chance of precipitation is 80%.
Friday
A 50 percent chance of rain. Mostly cloudy, with a high near 73.
Friday Night
Rain likely. Mostly cloudy, with a low around 56.
Saturday
Rain likely. Mostly cloudy, with a high near 66. Breezy.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 39.
Sunday
Partly sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
1:26 am CDT Mar 30, 2026
Forecast Valid:
2am CDT Mar 30, 2026-6pm CDT Apr 5, 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