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 >

Hazardous Weather Conditions

Current conditions at

Riverton Regional Airport (KRIW)

Lat: 43.06219°NLon: 108.44701°WElev: 5443.0ft.

Clear

43°F

6°C

Humidity 86%
Wind Speed NW 8 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 15 Oct 08:35 AM MDT
Extended Forecast for

3 Miles ENE Arapahoe WY

  • Today

    Today: A slight chance of showers, with thunderstorms also possible after noon.  Mostly sunny, with a high near 65. Breezy, with a west southwest wind 5 to 10 mph becoming south southeast 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph.  Chance of precipitation is 20%.

    High: 65 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms and
    Breezy

  • Tonight

    Tonight: A slight chance of showers and thunderstorms, then showers likely after 9pm.  Partly cloudy, with a low around 37. Breezy, with a south wind 6 to 15 mph becoming northwest in the evening. Winds could gust as high as 22 mph.  Chance of precipitation is 60%.

    Low: 37 °F

    Chance
    Showers and
    Breezy then
    Showers
    Likely

  • Thursday

    Thursday: Showers likely, mainly before noon.  Mostly cloudy, with a high near 51. Southwest wind around 8 mph becoming northwest in the morning.  Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 51 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 31. Southwest wind 5 to 7 mph.

    Low: 31 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 60. Southwest wind 7 to 10 mph becoming west northwest in the afternoon.

    High: 60 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A slight chance of rain showers after midnight, mixing with snow after 5am.  Mostly clear, with a low around 31. West southwest wind 6 to 9 mph.  Chance of precipitation is 20%.

    Low: 31 °F

    Mostly Clear
    then Slight
    Chance
    Rain/Snow

  • Saturday

    Saturday: Sunny, with a high near 56. West wind around 7 mph becoming northeast in the afternoon.

    High: 56 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 65. Breezy, with a west southwest wind 5 to 10 mph becoming south southeast 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 20%.
Tonight
A slight chance of showers and thunderstorms, then showers likely after 9pm. Partly cloudy, with a low around 37. Breezy, with a south wind 6 to 15 mph becoming northwest in the evening. Winds could gust as high as 22 mph. Chance of precipitation is 60%.
Thursday
Showers likely, mainly before noon. Mostly cloudy, with a high near 51. Southwest wind around 8 mph becoming northwest in the morning. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Partly cloudy, with a low around 31. Southwest wind 5 to 7 mph.
Friday
Mostly sunny, with a high near 60. Southwest wind 7 to 10 mph becoming west northwest in the afternoon.
Friday Night
A slight chance of rain showers after midnight, mixing with snow after 5am. Mostly clear, with a low around 31. West southwest wind 6 to 9 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 56. West wind around 7 mph becoming northeast in the afternoon.
Saturday Night
Mostly clear, with a low around 31.
Sunday
Sunny, with a high near 68.
Sunday Night
A 30 percent chance of showers, mainly after midnight. Partly cloudy, with a low around 35.
Monday
A chance of showers. Mostly sunny, with a high near 59.
Monday Night
A chance of rain and snow showers. Partly cloudy, with a low around 27.
Tuesday
Mostly sunny, with a high near 51.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Arapahoe WY
 43°N 108.41°W (Elev. 4957 ft)
8:48 am MDT Oct 15, 2025
9am MDT Oct 15, 2025-6pm MDT Oct 21, 2025
 
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Additional Resources

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