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

Excessive Rainfall and Tropical Storm in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce considerable, potentially life-threatening, flooding across the lower Mississippi River Valley and central Great Lakes region through tonight. Tropical Storm Arthur will move northeastward along the Texas coast today and then move inland over southwestern Louisiana by tonight. An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

NA

83°F

28°C

Humidity 47%
Wind Speed NE 3 MPH
Barometer NA
Dewpoint 61°F (16°C)
Visibility NA
Heat Index83°F (28°C)
Last update 17 Jun 04:10 PM PDT
Extended Forecast for

2 Miles SSE Portola Valley CA

  • Tonight

    Tonight: Partly cloudy, with a low around 56. South wind 3 to 6 mph.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 72. South southwest wind 3 to 8 mph. Winds could gust as high as 18 mph.

    High: 72 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 56. South wind 6 to 8 mph, with gusts as high as 18 mph.

    Low: 56 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 68. South wind 6 to 8 mph, with gusts as high as 18 mph.

    High: 68 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 55. South southwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 21 mph.

    Low: 55 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 56. South wind 3 to 6 mph.
Thursday
Sunny, with a high near 72. South southwest wind 3 to 8 mph. Winds could gust as high as 18 mph.
Thursday Night
Partly cloudy, with a low around 56. South wind 6 to 8 mph, with gusts as high as 18 mph.
Juneteenth
Mostly sunny, with a high near 68. South wind 6 to 8 mph, with gusts as high as 18 mph.
Friday Night
Partly cloudy, with a low around 55. South southwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 21 mph.
Saturday
Mostly sunny, with a high near 69.
Saturday Night
Partly cloudy, with a low around 51.
Sunday
Mostly sunny, with a high near 70.
Sunday Night
Partly cloudy, with a low around 52.
Monday
Mostly sunny, with a high near 72.
Monday Night
Mostly clear, with a low around 53.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Portola Valley CA
 37.35°N 122.21°W (Elev. 1440 ft)
Last Update:
2:05 pm PDT Jun 17, 2026
Forecast Valid:
4pm PDT Jun 17, 2026-6pm PDT Jun 24, 2026
 
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