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

54°F

12°C

Humidity 48%
Wind Speed S 21 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 24 Dec 09:53 PM MST
Extended Forecast for

Riverton WY

  • Tonight

    Tonight: Partly cloudy, with a low around 43. Breezy, with a south wind around 22 mph, with gusts as high as 31 mph.

    Low: 43 °F

    Partly Cloudy
    and Breezy

  • Christmas Day

    Christmas Day: Mostly sunny, with a high near 59. Breezy, with a southwest wind 17 to 24 mph, with gusts as high as 33 mph.

    High: 59 °F

    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 38. Breezy, with a south southwest wind 14 to 17 mph, with gusts as high as 24 mph.

    Low: 38 °F

    Mostly Clear
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Scattered showers, mainly after 11am. Mostly sunny, with a high near 53. Breezy, with a south southwest wind 17 to 24 mph, with gusts as high as 33 mph. Chance of precipitation is 40%.

    High: 53 °F

    Scattered
    Showers and
    Breezy

  • Friday Night

    Friday Night: A chance of rain showers before 8pm, then a chance of rain and snow showers between 8pm and 2am, then a slight chance of snow showers after 2am. Mostly cloudy, with a low around 29. Breezy, with a south southwest wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

    Low: 29 °F

    Chance
    Rain/Snow and
    Breezy

  • Saturday

    Saturday: Mostly sunny, with a high near 45. Southwest wind 11 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 23 mph.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of snow showers before 11pm. Partly cloudy, with a low around 11. North wind 9 to 11 mph.

    Low: 11 °F

    Slight Chance
    Snow Showers
    then Partly
    Cloudy

  • Sunday

    Sunday: Sunny, with a high near 31.

    High: 31 °F

    Sunny

  • Sunday Night

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

    Low: 8 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 43. Breezy, with a south wind around 22 mph, with gusts as high as 31 mph.
Christmas Day
Mostly sunny, with a high near 59. Breezy, with a southwest wind 17 to 24 mph, with gusts as high as 33 mph.
Thursday Night
Mostly clear, with a low around 38. Breezy, with a south southwest wind 14 to 17 mph, with gusts as high as 24 mph.
Friday
Scattered showers, mainly after 11am. Mostly sunny, with a high near 53. Breezy, with a south southwest wind 17 to 24 mph, with gusts as high as 33 mph. Chance of precipitation is 40%.
Friday Night
A chance of rain showers before 8pm, then a chance of rain and snow showers between 8pm and 2am, then a slight chance of snow showers after 2am. Mostly cloudy, with a low around 29. Breezy, with a south southwest wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Saturday
Mostly sunny, with a high near 45. Southwest wind 11 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 23 mph.
Saturday Night
A 20 percent chance of snow showers before 11pm. Partly cloudy, with a low around 11. North wind 9 to 11 mph.
Sunday
Sunny, with a high near 31.
Sunday Night
Mostly clear, with a low around 8.
Monday
Sunny, with a high near 36.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
Sunny, with a high near 42.
Tuesday Night
Partly cloudy, with a low around 17.
Wednesday
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:
9:17 pm MST Dec 24, 2025
Forecast Valid:
10pm MST Dec 24, 2025-6pm MST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation