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

Remnants of Arthur and Heavy Rainfall Across the South; Fire Weather Threat in the West

Life-threatening, potentially catastrophic flash flooding expected along the central Gulf Coast as the remnants of Arthur track across the area. Isolated brief tornadoes and damaging gusts remain possible overnight in the Southeast. Isolated to scattered dry thunderstorms may cause lightning-ignited fires and erratic behavior due to gusty winds across parts of the West Friday. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

NA

65°F

18°C

Humidity 63%
Wind Speed W 1 MPH
Barometer NA
Dewpoint 52°F (11°C)
Visibility NA
Last update 19 Jun 08:10 AM PDT
Extended Forecast for

2 Miles NNE Portola Valley CA

  • Juneteenth

    Juneteenth: Sunny, with a high near 75. South southwest wind 5 to 9 mph.

    High: 75 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 55. Southwest wind 5 to 8 mph becoming calm in the evening.

    Low: 55 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 75. Calm wind becoming west 5 to 8 mph in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 52. West wind 5 to 7 mph becoming calm in the evening.

    Low: 52 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Mostly sunny, with a high near 77. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 77 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy fog before 2am, then patchy fog after 3am. Otherwise, mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Sunny, with a high near 75. South southwest wind 5 to 9 mph.
Tonight
Increasing clouds, with a low around 55. Southwest wind 5 to 8 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 75. Calm wind becoming west 5 to 8 mph in the afternoon.
Saturday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 52. West wind 5 to 7 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 77. Calm wind becoming west 5 to 7 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 53.
Monday
Mostly sunny, with a high near 80.
Monday Night
Patchy fog before 2am, then patchy fog after 3am. Otherwise, mostly clear, with a low around 54.
Tuesday
Mostly sunny, with a high near 83.
Tuesday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 55.
Wednesday
Sunny, with a high near 84.
Wednesday Night
Patchy fog. Otherwise, mostly clear, with a low around 55.
Thursday
Sunny, with a high near 83.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNE Portola Valley CA
 37.4°N 122.2°W (Elev. 397 ft)
Last Update:
2:16 am PDT Jun 19, 2026
Forecast Valid:
8am PDT Jun 19, 2026-6pm PDT Jun 25, 2026
 
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