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

Heavy to Excessive Rainfall for the Southwest; Thunderstorms in Florida with Flooding Possible

Tropical moisture from Priscilla will bring a multi-day thunderstorm, widespread heavy rainfall and flash flooding event across the Southwest/Four Corners region. Flash flooding will be a concern in burn scars, slot canyons, and urban areas. Widespread storms are expected in central/South Florida with some isolated flash flooding possible. Read More >

Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

NA

58°F

14°C

Humidity 75%
Wind Speed WSW 2 MPH
Barometer NA
Dewpoint 50°F (10°C)
Visibility NA
Last update 09 Oct 07:10 AM PDT
Extended Forecast for

Portola Valley CA

  • Today

    Today: A slight chance of drizzle before 11am. Mostly sunny, with a high near 75. South wind around 6 mph.

    High: 75 °F

    Slight Chance
    Drizzle then
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 52. Light west southwest wind.

    Low: 52 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 75. Calm wind becoming west around 5 mph in the afternoon.

    High: 75 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 53. West wind around 6 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 74. Light northwest wind becoming west northwest 6 to 11 mph in the afternoon. Winds could gust as high as 21 mph.

    High: 74 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 50.

    Low: 50 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: A chance of rain, mainly after 11am. Partly sunny, with a high near 70.

    High: 70 °F

    Chance Rain

Detailed Forecast

Today
A slight chance of drizzle before 11am. Mostly sunny, with a high near 75. South wind around 6 mph.
Tonight
Mostly clear, with a low around 52. Light west southwest wind.
Friday
Sunny, with a high near 75. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 53. West wind around 6 mph becoming calm in the evening.
Saturday
Sunny, with a high near 74. Light northwest wind becoming west northwest 6 to 11 mph in the afternoon. Winds could gust as high as 21 mph.
Saturday Night
Clear, with a low around 50.
Sunday
Sunny, with a high near 75.
Sunday Night
Mostly clear, with a low around 51.
Columbus Day
A chance of rain, mainly after 11am. Partly sunny, with a high near 70.
Monday Night
Rain likely. Mostly cloudy, with a low around 52.
Tuesday
Rain likely. Mostly cloudy, with a high near 70.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 51.
Wednesday
A chance of rain. Partly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portola Valley CA
 37.39°N 122.23°W (Elev. 397 ft)
Last Update:
1:26 am PDT Oct 9, 2025
Forecast Valid:
7am PDT Oct 9, 2025-6pm PDT Oct 15, 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