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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

Riverton Regional Airport (KRIW)

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

Clear

46°F

8°C

Humidity 42%
Wind Speed WSW 10 MPH
Barometer 29.86 in (1011.18 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 25 Dec 05:20 PM MST
Extended Forecast for

Riverton WY

  • Tonight

    Tonight: Mostly clear, with a low around 33. Southwest wind 11 to 14 mph, with gusts as high as 20 mph.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Scattered showers, mainly after 5pm. Mostly sunny, with a high near 54. Windy, with a south southwest wind 16 to 21 mph increasing to 24 to 29 mph in the afternoon. Winds could gust as high as 44 mph. Chance of precipitation is 30%.

    High: 54 °F

    Mostly Sunny
    and Breezy
    then
    Scattered
    Showers and
    Windy

  • Friday Night

    Friday Night: Scattered rain showers before 8pm, then scattered rain and snow showers between 8pm and 2am, then a slight chance of snow showers after 2am. Mostly cloudy, with a low around 28. Breezy, with a south southwest wind 13 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

    Low: 28 °F

    Scattered
    Rain/Snow and
    Breezy

  • Saturday

    Saturday: Mostly sunny, with a high near 46. Breezy, with a southwest wind 11 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 46 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: A 30 percent chance of snow showers. Mostly cloudy, with a low around 12. North wind 9 to 13 mph.

    Low: 12 °F

    Chance Snow
    Showers

  • Sunday

    Sunday: Sunny, with a high near 29. North northwest wind 5 to 7 mph becoming light and variable in the morning.

    High: 29 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 8. Light southwest wind.

    Low: 8 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 13.

    Low: 13 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 33. Southwest wind 11 to 14 mph, with gusts as high as 20 mph.
Friday
Scattered showers, mainly after 5pm. Mostly sunny, with a high near 54. Windy, with a south southwest wind 16 to 21 mph increasing to 24 to 29 mph in the afternoon. Winds could gust as high as 44 mph. Chance of precipitation is 30%.
Friday Night
Scattered rain showers before 8pm, then scattered rain and snow showers between 8pm and 2am, then a slight chance of snow showers after 2am. Mostly cloudy, with a low around 28. Breezy, with a south southwest wind 13 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Saturday
Mostly sunny, with a high near 46. Breezy, with a southwest wind 11 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.
Saturday Night
A 30 percent chance of snow showers. Mostly cloudy, with a low around 12. North wind 9 to 13 mph.
Sunday
Sunny, with a high near 29. North northwest wind 5 to 7 mph becoming light and variable in the morning.
Sunday Night
Mostly clear, with a low around 8. Light southwest wind.
Monday
Sunny, with a high near 34.
Monday Night
Mostly clear, with a low around 13.
Tuesday
Mostly sunny, with a high near 39.
Tuesday Night
Partly cloudy, with a low around 17.
Wednesday
Mostly sunny, with a high near 45.
Wednesday Night
Mostly cloudy, with a low around 21.
New Year's Day
Mostly sunny, with a high near 45.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Riverton WY
 43.02°N 108.38°W (Elev. 4931 ft)
Last Update:
4:17 pm MST Dec 25, 2025
Forecast Valid:
5pm MST Dec 25, 2025-6pm MST Jan 1, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation