Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, 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

60°F

16°C

Humidity 92%
Wind Speed ENE 1 MPH
Barometer NA
Dewpoint 58°F (14°C)
Visibility NA
Last update 19 Aug 12:10 AM PDT
Extended Forecast for

3 Miles NNW Portola Valley CA

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 59. Calm wind.

    Low: 59 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 85. Calm wind becoming north around 5 mph in the afternoon.

    High: 85 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 57. Calm wind.

    Low: 57 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Partly sunny, with a high near 81. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 81 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 57. Northwest wind around 6 mph becoming calm  in the evening.

    Low: 57 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 79.

    High: 79 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 59. Calm wind.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 85. Calm wind becoming north around 5 mph in the afternoon.
Wednesday Night
Increasing clouds, with a low around 57. Calm wind.
Thursday
Partly sunny, with a high near 81. Calm wind becoming northwest around 6 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 57. Northwest wind around 6 mph becoming calm in the evening.
Friday
Partly sunny, with a high near 79.
Friday Night
Partly cloudy, with a low around 56.
Saturday
Mostly sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 56.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 56.
Monday
Mostly sunny, with a high near 80.
Monday Night
Patchy fog. Otherwise, partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Portola Valley CA
 37.42°N 122.23°W (Elev. 397 ft)
12:47 am PDT Aug 19, 2026
1am PDT Aug 19, 2026-6pm PDT Aug 25, 2026
 
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Additional Resources

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