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

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Mostly Cloudy

73°F

23°C

Humidity 89%
Wind Speed S 8 mph
Barometer 29.97 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 19 Aug 12:45 pm CDT
Extended Forecast for

3 Miles NW Tunnel Hill IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms before 2pm. Partly sunny, with a high near 83. South southwest wind 3 to 6 mph.

    High: 83 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 1am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 70%.

    Low: 68 °F

    Heavy Rain
    then Chance
    T-storms

  • Thursday

    Thursday: Partly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 84 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86. Light north northeast wind.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 86. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 86 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 85. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms before 2pm. Partly sunny, with a high near 83. South southwest wind 3 to 6 mph.
Tonight
Showers and thunderstorms likely, mainly before 1am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 70%.
Thursday
Partly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 67. Calm wind.
Friday
Sunny, with a high near 86. Light north northeast wind.
Friday Night
Mostly clear, with a low around 67. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 86. Calm wind becoming northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 66. Calm wind.
Sunday
Mostly sunny, with a high near 85. Calm wind becoming north northwest around 6 mph in the afternoon.
Sunday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 65. Calm wind.
Monday
A slight chance of showers. Mostly sunny, with a high near 84. Calm wind becoming southeast around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 66. Light east wind.
Tuesday
Sunny, with a high near 88. East wind 3 to 6 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Tunnel Hill IL
 37.58°N 88.9°W
Last Update:
11:41 am CDT Aug 19, 2026
Forecast Valid:
1pm CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
Forecast Discussion
 
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Additional Resources

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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