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

Storm Systems to Impact the Central and Eastern U.S. Through the Weekend

Two storm systems will track through the central and eastern U.S. today through this weekend with areas of gusty winds, rain and heavy snow. Severe thunderstorms and heavy to excessive rainfall is forecast today from the Lower Mississippi River Valley to the Tennessee Valley. Damaging winds, a few tornadoes, and areas of flooding are possible. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

NA

40°F

4°C

Humidity 83%
Wind Speed WSW 2 MPH
Barometer NA
Dewpoint 35°F (2°C)
Visibility NA
Last update 11 Jan 02:10 AM PST
Extended Forecast for

Portola Valley CA

  • Overnight

    Overnight: Widespread frost, mainly between 4am and 5am. Otherwise, mostly cloudy, with a low around 33. Calm wind.

    Low: 33 °F

    Frost

  • Sunday

    Sunday: Areas of frost before 8am. Otherwise, mostly sunny, with a high near 61. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 61 °F

    Areas Frost
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.

    High: 61 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 41. Light east northeast wind.

    Low: 41 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 43.

    Low: 43 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 45.

    Low: 45 °F

    Clear

Detailed Forecast

Overnight
Widespread frost, mainly between 4am and 5am. Otherwise, mostly cloudy, with a low around 33. Calm wind.
Sunday
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 61. Calm wind becoming north northeast around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 41. Calm wind.
Monday
Sunny, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.
Monday Night
Clear, with a low around 41. Light east northeast wind.
Tuesday
Sunny, with a high near 65.
Tuesday Night
Clear, with a low around 43.
Wednesday
Sunny, with a high near 66.
Wednesday Night
Clear, with a low around 45.
Thursday
Sunny, with a high near 67.
Thursday Night
Mostly clear, with a low around 46.
Friday
Sunny, with a high near 67.
Friday Night
Mostly clear, with a low around 46.
Saturday
Mostly sunny, with a high near 66.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portola Valley CA
 37.39°N 122.23°W (Elev. 397 ft)
Last Update:
12:26 am PST Jan 11, 2026
Forecast Valid:
2am PST Jan 11, 2026-6pm PST Jan 17, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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