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.

Overcast

72°F

22°C

Humidity 97%
Wind Speed Calm
Barometer 29.88 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 17 Jun 4:35 am CDT
Extended Forecast for

3 Miles SW Simpson IL

  • Overnight

    Overnight: A 30 percent chance of showers. Cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 7am. Patchy fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 85. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    T-storms and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 73. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 73 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. Partly sunny, with a high near 88. South southwest wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    High: 88 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely before 4am, then a chance of showers. Mostly cloudy, with a low around 70. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    Low: 70 °F

    T-storms
    Likely then
    Showers
    Likely

  • Juneteenth

    Juneteenth: A slight chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Mostly sunny, with a high near 85. West northwest wind 3 to 5 mph. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • 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 89. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 72. Light south wind.

    Low: 72 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers. Cloudy, with a low around 70. Calm wind.
Tuesday
A chance of showers, with thunderstorms also possible after 7am. Patchy fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 85. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 30%.
Tuesday Night
Increasing clouds, with a low around 73. Calm wind becoming south southwest around 6 mph after midnight.
Wednesday
A slight chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. Partly sunny, with a high near 88. South southwest wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Wednesday Night
Showers and thunderstorms likely before 4am, then a chance of showers. Mostly cloudy, with a low around 70. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Juneteenth
A slight chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Mostly sunny, with a high near 85. West northwest wind 3 to 5 mph. Chance of precipitation is 20%.
Thursday Night
Mostly clear, with a low around 67. Calm wind.
Friday
Sunny, with a high near 89. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 72. Light south wind.
Saturday
Sunny, with a high near 92. South southwest wind 5 to 9 mph.
Saturday Night
Clear, with a low around 75. South wind 3 to 6 mph.
Sunday
Sunny, with a high near 93. South southwest wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 75. South wind around 5 mph becoming calm in the evening.
Monday
A slight chance of showers and thunderstorms. Sunny, with a high near 93. Calm wind becoming south southwest around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Simpson IL
 37.44°N 88.8°W
Last Update:
2:16 am CDT Jun 17, 2025
Forecast Valid:
4am CDT Jun 17, 2025-6pm CDT Jun 23, 2025
 
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