Severe Weather and Heavy Rain from the Great Lakes to the Mid-Atlantic; Heat Persists in the East

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected from the Upper Ohio Valley into the southern Mid-Atlantic today and portions of the central Appalachians and Carolinas on Saturday. Monsoonal moisture will bring a flash flooding threat to the Desert Southwest. Sweltering heat persists from the Plains to the southern Mid-Atlantic through tonight. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

NA

51°F

11°C

Humidity 69%
Wind Speed WSW 4 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 05 Sep 12:10 AM PDT
Extended Forecast for

2 Miles NNE Portola Valley CA

  • Overnight

    Overnight: Patchy fog before 2am, then patchy fog after 4am.  Otherwise, mostly clear, with a low around 53. Calm wind.

    Low: 53 °F

    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 8am.  Otherwise, sunny, with a high near 77. Light and variable wind becoming west northwest 5 to 10 mph in the morning.

    High: 77 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 53. West wind 5 to 7 mph becoming calm  in the evening.

    Low: 53 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 75. Light west southwest wind becoming west northwest 6 to 11 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 75 °F

    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 5am.  Otherwise, mostly clear, with a low around 53. West northwest wind 6 to 11 mph becoming light west  after midnight. Winds could gust as high as 21 mph.

    Low: 53 °F

    Mostly Clear
    then Patchy
    Fog

  • Labor Day

    Labor Day: Patchy fog before 8am.  Otherwise, sunny, with a high near 85.

    High: 85 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of rain after 11pm.  Partly cloudy, with a low around 61.

    Low: 61 °F

    Slight Chance
    Rain

Detailed Forecast

Overnight
Patchy fog before 2am, then patchy fog after 4am. Otherwise, mostly clear, with a low around 53. Calm wind.
Saturday
Patchy fog before 8am. Otherwise, sunny, with a high near 77. Light and variable wind becoming west northwest 5 to 10 mph in the morning.
Saturday Night
Mostly clear, with a low around 53. West wind 5 to 7 mph becoming calm in the evening.
Sunday
Sunny, with a high near 75. Light west southwest wind becoming west northwest 6 to 11 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Patchy fog after 5am. Otherwise, mostly clear, with a low around 53. West northwest wind 6 to 11 mph becoming light west after midnight. Winds could gust as high as 21 mph.
Labor Day
Patchy fog before 8am. Otherwise, sunny, with a high near 85.
Monday Night
Mostly clear, with a low around 57.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
A slight chance of rain after 11pm. Partly cloudy, with a low around 61.
Wednesday
A slight chance of rain. Partly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 60.
Friday
Mostly sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNE Portola Valley CA
 37.4°N 122.2°W (Elev. 397 ft)
12:47 am PDT Sep 5, 2026
12am PDT Sep 5, 2026-6pm PDT Sep 11, 2026
 
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