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

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

NA

40°F

4°C

Humidity 100%
Wind Speed SSW 16 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Wind Chill32°F (0°C)
Last update 25 Dec 07:20 AM PST
Extended Forecast for

3 Miles ENE Danville CA

Flood Watch December 25, 07:39am until December 26, 10:00pm
Wind Advisory December 25, 07:39am until December 25, 10:00am
Flood Advisory December 25, 07:39am until December 25, 07:45am
Click here for hazard details and duration
Flood Watch
...
...
  •  
    Flood Watch December 25, 07:39am until December 26, 10:00pm
    Wind Advisory December 25, 07:39am until December 25, 10:00am
    Flood Advisory December 25, 07:39am until December 25, 07:45am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Christmas Day

    High: 56 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: Rain before 7pm, then showers and possibly a thunderstorm between 7pm and 10pm, then rain likely after 10pm. Some of the storms could be severe. Low around 46. South wind 11 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Severe
    Thunderstorms
    then Rain
    Likely

  • Friday

    Friday: Rain, mainly before 4pm. High near 55. South wind 9 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 55 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 42. Southwest wind 3 to 5 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Chance Rain
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 10am. Partly sunny, with a high near 53. Calm wind becoming north around 6 mph in the afternoon.

    High: 53 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 2am. Otherwise, mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Areas of frost before 8am. Otherwise, mostly sunny, with a high near 52.

    High: 52 °F

    Areas Frost
    then Sunny

  • Sunday Night

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

    Low: 34 °F

    Mostly Clear
    then Patchy
    Frost

Detailed Forecast

Christmas Day
Rain before 10am, then showers and possibly a thunderstorm between 10am and 4pm, then rain after 4pm. Some of the storms could be severe. High near 56. South southwest wind 15 to 20 mph, with gusts as high as 40 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Rain before 7pm, then showers and possibly a thunderstorm between 7pm and 10pm, then rain likely after 10pm. Some of the storms could be severe. Low around 46. South wind 11 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain, mainly before 4pm. High near 55. South wind 9 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A 50 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 42. Southwest wind 3 to 5 mph. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 20 percent chance of rain before 10am. Partly sunny, with a high near 53. Calm wind becoming north around 6 mph in the afternoon.
Saturday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 36.
Sunday
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 52.
Sunday Night
Patchy frost after midnight. Otherwise, mostly clear, with a low around 34.
Monday
Areas of frost before 9am. Otherwise, sunny, with a high near 53.
Monday Night
Areas of frost after 1am. Otherwise, mostly clear, with a low around 34.
Tuesday
Patchy frost. Otherwise, mostly sunny, with a high near 54.
Tuesday Night
Partly cloudy, with a low around 36.
Wednesday
Mostly cloudy, with a high near 55.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Danville CA
 37.84°N 121.97°W (Elev. 600 ft)
Last Update:
12:27 am PST Dec 25, 2025
Forecast Valid:
7am PST Dec 25, 2025-6pm PST 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