Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

NA

72°F

22°C

Humidity 58%
Wind Speed ENE 2 MPH
Barometer NA
Dewpoint 56°F (13°C)
Visibility NA
Last update 19 Aug 07:10 PM PDT
Extended Forecast for

Portola Valley CA

  • Tonight

    Tonight: Mostly clear, with a low around 56. Southwest wind around 6 mph becoming calm  in the evening.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 76. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 76 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 57. West wind 3 to 7 mph.

    Low: 57 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 74. Calm wind becoming west northwest 5 to 7 mph in the afternoon.

    High: 74 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 55. West northwest wind 5 to 8 mph.

    Low: 55 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Saturday Night

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

    Low: 55 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 56. Southwest wind around 6 mph becoming calm in the evening.
Thursday
Partly sunny, with a high near 76. Calm wind becoming west 5 to 7 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 57. West wind 3 to 7 mph.
Friday
Mostly sunny, with a high near 74. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Friday Night
Mostly clear, with a low around 55. West northwest wind 5 to 8 mph.
Saturday
Sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 55.
Sunday
Mostly sunny, with a high near 76.
Sunday Night
Mostly clear, with a low around 56.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 55.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 77.
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ABOUT THIS FORECAST

 
Point Forecast:
Portola Valley CA
 37.35°N 122.21°W (Elev. 1440 ft)
1:26 pm PDT Aug 19, 2026
7pm PDT Aug 19, 2026-6pm PDT Aug 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database