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

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Overcast

66°F

19°C

Humidity 78%
Wind Speed NE 9 mph
Barometer 30.07 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 21 May 2:52 pm CDT
Extended Forecast for

Murphysboro IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 73. Northeast wind around 7 mph.

    High: 73 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 58. East northeast wind 5 to 8 mph.

    Low: 58 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers before 1pm, then showers likely and possibly a thunderstorm between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Cloudy, with a high near 73. East northeast wind 5 to 7 mph. Chance of precipitation is 70%.

    High: 73 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. East northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 60 °F

    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 81. Light west northwest wind.

    High: 81 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 50%.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Memorial Day

    Memorial Day: A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Calm wind becoming east around 5 mph in the afternoon.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 73. Northeast wind around 7 mph.
Tonight
Mostly cloudy, with a low around 58. East northeast wind 5 to 8 mph.
Friday
A chance of showers before 1pm, then showers likely and possibly a thunderstorm between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Cloudy, with a high near 73. East northeast wind 5 to 7 mph. Chance of precipitation is 70%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. East northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.
Saturday
Partly sunny, with a high near 81. Light west northwest wind.
Saturday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 61. Calm wind.
Sunday
A chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 50%.
Sunday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 63. Calm wind.
Memorial Day
A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. East southeast wind around 5 mph becoming calm in the evening.
Tuesday
Showers and thunderstorms likely. Partly sunny, with a high near 82. East wind 3 to 6 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. East southeast wind 3 to 7 mph.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 84. South wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Murphysboro IL
 37.77°N 89.34°W
Last Update:
2:16 pm CDT May 21, 2026
Forecast Valid:
3pm CDT May 21, 2026-6pm CDT May 27, 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