Early Spring Heat Wave in the Southwest U.S.; Critical Fire Weather in the Central Rockies and Plains

An unusual early Spring heat wave will continue much above-normal temperatures over the Southwest U.S. through early next week. Periods of critical fire weather will persist from the central Rockies to the central Plains through the weekend as gusty winds and low relative humidity continue. Read More >

Hazardous Weather Conditions

Current conditions at

LOS ALTOS (LOAC1)

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

NA

64°F

18°C

Humidity 72%
Wind Speed WSW 4 MPH
Barometer NA
Dewpoint 55°F (13°C)
Visibility NA
Last update 20 Mar 01:10 AM PDT
Extended Forecast for

5 Miles WSW Cupertino CA

Heat Advisory March 20, 01:31am until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 20, 01:31am until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Overnight

    Low: 69 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 87. Light and variable wind becoming north around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 64. West wind 3 to 5 mph.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 74. Northwest wind 5 to 9 mph, with gusts as high as 21 mph.

    High: 74 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 53. West northwest wind 7 to 9 mph, with gusts as high as 22 mph.

    Low: 53 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

Detailed Forecast

Overnight
Clear, with a low around 69. Light northeast wind.
Friday
Sunny, with a high near 87. Light and variable wind becoming north around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 64. West wind 3 to 5 mph.
Saturday
Mostly sunny, with a high near 74. Northwest wind 5 to 9 mph, with gusts as high as 21 mph.
Saturday Night
Mostly clear, with a low around 53. West northwest wind 7 to 9 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 74.
Sunday Night
Mostly clear, with a low around 50.
Monday
Sunny, with a high near 72.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 53.
Wednesday
Sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Sunny, with a high near 72.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Cupertino CA
 37.29°N 122.14°W (Elev. 1798 ft)
1:26 am PDT Mar 20, 2026
1am PDT Mar 20, 2026-6pm PDT Mar 26, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database