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

Heavy Rainfall and Severe Thunderstorm Threats for the Plains and Southeast

A frontal boundary extending from the western High Plains to the Southeast will focus additional showers and thunderstorms this weekend. Some of these storms may become severe, alongside frequent lightning, and isolated instances of flash flooding. Meanwhile dry conditions will continue for the Great Basin where fire weather concerns linger. For the mid-Atlantic and Northeast, seasonable weather. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

NA

53°F

12°C

Humidity 96%
Wind Speed WSW 2 MPH
Barometer NA
Dewpoint 52°F (11°C)
Visibility NA
Last update 03 Aug 04:10 AM PDT
Extended Forecast for

Portola Valley CA

  • Today

    Today: Sunny, with a high near 76. Light and variable wind becoming west 9 to 14 mph in the afternoon. Winds could gust as high as 23 mph.

    High: 76 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 52. West southwest wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 52 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76. West wind 9 to 13 mph.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52. West southwest wind 9 to 14 mph.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80. Calm wind becoming west around 6 mph in the afternoon.

    High: 80 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 53.

    Low: 53 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 76. Light and variable wind becoming west 9 to 14 mph in the afternoon. Winds could gust as high as 23 mph.
Tonight
Mostly clear, with a low around 52. West southwest wind 11 to 14 mph, with gusts as high as 23 mph.
Monday
Sunny, with a high near 76. West wind 9 to 13 mph.
Monday Night
Mostly clear, with a low around 52. West southwest wind 9 to 14 mph.
Tuesday
Sunny, with a high near 80. Calm wind becoming west around 6 mph in the afternoon.
Tuesday Night
Clear, with a low around 53.
Wednesday
Sunny, with a high near 84.
Wednesday Night
Mostly clear, with a low around 55.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 54.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 54.
Saturday
Sunny, with a high near 83.
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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:
3:11 am PDT Aug 3, 2025
Forecast Valid:
5am PDT Aug 3, 2025-6pm PDT Aug 9, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation