Heavy Rain and Thunderstorms in the Plains; Snow in the Northern Rockies; Heavy Rain in Guam

A storm system moving over the Rockies today will bring marginal risks for excessive rainfall and severe thunderstorms from parts of New Mexico into western South Dakota. Heavy snow expected from northwestern Wyoming into southern Montana. Ongoing heavy showers and thunderstorms from Invest 96W could result in localized flash flooding, particularly in central or southern Guam early this morning. Read More >

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

61°F

16°C

Humidity 88%
Wind Speed Calm
Barometer 30.22 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 15 Oct 8:45 am CDT
Extended Forecast for

Simpson IL

  • Today

    Today: Sunny, with a high near 82. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 57. Calm wind.

    Low: 57 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 78. Calm wind becoming east around 6 mph in the morning.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 54. Light east wind.

    Low: 54 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 79. Calm wind becoming southeast around 5 mph in the morning.

    High: 79 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61. Calm wind becoming south around 6 mph after midnight.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm.  Partly sunny, with a high near 77. South wind 6 to 11 mph, with gusts as high as 21 mph.  Chance of precipitation is 70%.

    High: 77 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 1am, then showers likely.  Mostly cloudy, with a low around 51. South southwest wind around 7 mph becoming west northwest after midnight.

    Low: 51 °F

    Showers

  • Sunday

    Sunday: A chance of showers before 1pm.  Mostly sunny, with a high near 67. West northwest wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 67 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 82. Calm wind becoming northeast around 5 mph in the afternoon.
Tonight
Clear, with a low around 57. Calm wind.
Thursday
Sunny, with a high near 78. Calm wind becoming east around 6 mph in the morning.
Thursday Night
Partly cloudy, with a low around 54. Light east wind.
Friday
Partly sunny, with a high near 79. Calm wind becoming southeast around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 61. Calm wind becoming south around 6 mph after midnight.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 77. South wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
Saturday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Mostly cloudy, with a low around 51. South southwest wind around 7 mph becoming west northwest after midnight.
Sunday
A chance of showers before 1pm. Mostly sunny, with a high near 67. West northwest wind 8 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 43. West northwest wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 72. South southwest wind 3 to 8 mph.
Monday Night
A slight chance of showers. Mostly clear, with a low around 50. South wind 3 to 6 mph.
Tuesday
A slight chance of showers. Sunny, with a high near 74. West southwest wind 6 to 10 mph, with gusts as high as 20 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Simpson IL
 37.46°N 88.77°W
7:01 am CDT Oct 15, 2025
9am CDT Oct 15, 2025-6pm CDT Oct 21, 2025
 
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Additional Resources

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