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

Arroyo Seco (CI114)

Lat: 36.359°NLon: 121.29°WElev: 235.0ft.

NA

N/A

Humidity 82%
Wind Speed NE 4 MPH
Barometer NA
Dewpoint N/A
Visibility NA
Last update 07 Mar 10:00 AM PST
Extended Forecast for

Greenfield CA

Flood Watch December 25, 03:39pm until December 26, 10:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch December 25, 03:39pm until December 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Christmas Day

    High: 59 °F

    Severe
    Thunderstorms
    and Windy

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm. Some of the storms could be severe. Cloudy, with a low around 46. Breezy, with an east southeast wind 21 to 26 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 48 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 46 °F

    Severe
    Thunderstorms
    and Breezy

  • Friday

    Friday: A 40 percent chance of showers. Mostly cloudy, with a high near 58. South wind 10 to 14 mph, with gusts as high as 25 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 58 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers, mainly before 9pm. Mostly cloudy, with a low around 42. Southeast wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 10am. Mostly sunny, with a high near 56. North northwest wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 56 °F

    Slight Chance
    Showers then
    Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 4am. Otherwise, mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 58.

    High: 58 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 2am. Otherwise, mostly clear, with a low around 34.

    Low: 34 °F

    Clear then
    Patchy Frost

Detailed Forecast

Christmas Day
A chance of showers and thunderstorms. Some of the storms could be severe. Cloudy, with a high near 59. Windy, with a southeast wind around 30 mph, with gusts as high as 49 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers likely and possibly a thunderstorm. Some of the storms could be severe. Cloudy, with a low around 46. Breezy, with an east southeast wind 21 to 26 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 48 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 58. South wind 10 to 14 mph, with gusts as high as 25 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A 40 percent chance of showers, mainly before 9pm. Mostly cloudy, with a low around 42. Southeast wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 20 percent chance of showers before 10am. Mostly sunny, with a high near 56. North northwest wind 6 to 11 mph, with gusts as high as 18 mph.
Saturday Night
Patchy frost after 4am. Otherwise, mostly clear, with a low around 36.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 58.
Sunday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 34.
Monday
Patchy frost before 9am. Otherwise, sunny, with a high near 62.
Monday Night
Areas of frost after 5am. Otherwise, mostly clear, with a low around 36.
Tuesday
Areas of frost. Otherwise, sunny, with a high near 66.
Tuesday Night
Mostly clear, with a low around 39.
Wednesday
Mostly sunny, with a high near 66.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 41.
New Year's Day
A chance of showers. Partly sunny, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
Greenfield CA
 36.32°N 121.25°W (Elev. 282 ft)
Last Update:
2:44 pm PST Dec 25, 2025
Forecast Valid:
3pm PST Dec 25, 2025-6pm PST Jan 1, 2026
 
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Additional Resources

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Chance of Precipitation