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

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Overcast

64°F

18°C

Humidity 78%
Wind Speed N 9 mph
Barometer 30.11 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 21 May 1:45 pm CDT
Extended Forecast for

3 Miles NNW Tunnel Hill IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 73. Northeast wind around 6 mph.

    High: 73 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 10 percent chance of showers after 5am. Mostly cloudy, with a low around 59. Northeast wind 5 to 7 mph.

    Low: 59 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm, mainly before 5pm, then a chance of showers and thunderstorms after 5pm. High near 73. East northeast wind around 6 mph becoming southeast in the afternoon. Chance of precipitation is 80%.

    High: 73 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 61. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 61 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 80. Calm wind becoming west northwest around 5 mph.

    High: 80 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 1am. Partly 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 1pm. Mostly cloudy, with a high near 81. Light east southeast wind. Chance of precipitation is 50%.

    High: 81 °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, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming east around 5 mph in the afternoon.

    High: 79 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 73. Northeast wind around 6 mph.
Tonight
A 10 percent chance of showers after 5am. Mostly cloudy, with a low around 59. Northeast wind 5 to 7 mph.
Friday
Showers and possibly a thunderstorm, mainly before 5pm, then a chance of showers and thunderstorms after 5pm. High near 73. East northeast wind around 6 mph becoming southeast in the afternoon. Chance of precipitation is 80%.
Friday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 61. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Saturday
Partly sunny, with a high near 80. Calm wind becoming west northwest around 5 mph.
Saturday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 61. Calm wind.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. Light east southeast 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, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Light east wind.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Southeast wind 3 to 7 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Southeast wind 3 to 6 mph.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 82. South wind 5 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Tunnel Hill IL
 37.58°N 88.9°W
Last Update:
2:16 pm CDT May 21, 2026
Forecast Valid:
2pm 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