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 >

Current conditions at

Gem Valley (ITDC3)

Lat: 42.64943°NLon: 111.82603°WElev: 5523.0ft.

Rain

44°F

7°C

Humidity 82%
Wind Speed WSW 15 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility 1.24 mi
Wind Chill37°F (3°C)
Last update 25 Dec 05:15 AM MST
Extended Forecast for

Downey ID

  • Overnight

    Overnight: Rain. Steady temperature around 45. South wind around 15 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.

    Low: 45 °F

    Rain

  • Christmas Day

    Christmas Day: Rain likely, mainly before 5pm. Snow level 7900 feet lowering to 7000 feet in the afternoon . Mostly cloudy, with a high near 53. Southeast wind 13 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 53 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain likely, mainly after 10pm. Snow level 7100 feet lowering to 6400 feet after midnight . Mostly cloudy, with a low around 36. South wind 14 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 70%.

    Low: 36 °F

    Rain Likely

  • Friday

    Friday: Rain before 2pm, then rain, possibly mixed with snow. Snow level 6400 feet lowering to 5800 feet in the afternoon . High near 46. South wind 15 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 46 °F

    Rain then
    Rain/Snow

  • Friday Night

    Friday Night: Rain, possibly mixed with snow, becoming all snow after 8pm. Low around 27. Southwest wind around 8 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 27 °F

    Rain/Snow
    then Chance
    Snow

  • Saturday

    Saturday: Snow likely. Mostly cloudy, with a high near 36. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 36 °F

    Snow Likely

  • Saturday Night

    Saturday Night: A 30 percent chance of snow before 11pm. Partly cloudy, with a low around 13. New snow accumulation of less than a half inch possible.

    Low: 13 °F

    Chance Snow
    then Partly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 10.

    Low: 10 °F

    Mostly Clear

Detailed Forecast

Overnight
Rain. Steady temperature around 45. South wind around 15 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.
Christmas Day
Rain likely, mainly before 5pm. Snow level 7900 feet lowering to 7000 feet in the afternoon . Mostly cloudy, with a high near 53. Southeast wind 13 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Thursday Night
Rain likely, mainly after 10pm. Snow level 7100 feet lowering to 6400 feet after midnight . Mostly cloudy, with a low around 36. South wind 14 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 70%.
Friday
Rain before 2pm, then rain, possibly mixed with snow. Snow level 6400 feet lowering to 5800 feet in the afternoon . High near 46. South wind 15 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Friday Night
Rain, possibly mixed with snow, becoming all snow after 8pm. Low around 27. Southwest wind around 8 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Saturday
Snow likely. Mostly cloudy, with a high near 36. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Saturday Night
A 30 percent chance of snow before 11pm. Partly cloudy, with a low around 13. New snow accumulation of less than a half inch possible.
Sunday
Mostly sunny, with a high near 30.
Sunday Night
Mostly clear, with a low around 10.
Monday
Sunny, with a high near 34.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
Mostly sunny, with a high near 39.
Tuesday Night
Partly cloudy, with a low around 17.
Wednesday
Sunny, with a high near 42.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Downey ID
 42.43°N 112.12°W (Elev. 4888 ft)
Last Update:
4:31 am MST Dec 25, 2025
Forecast Valid:
5am MST Dec 25, 2025-6pm MST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation