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

Dangerous Surf and Rip Currents for most of the Atlantic Shoreline; Record Heat for the West

Hurricane Erin continues to track northward. Tropical storm force winds, storm surge conditions will increase for the Outer Banks today and portions of coastal Virginia. Life-threatening surf and rip currents along much of the east coast of the U.S. this week. Major to extreme HeatRisk with new record high temperatures are expected for many areas of the western U.S. this week. Read More >

Hazardous Weather Conditions

Current conditions at

San Jose, San Jose International Airport (KSJC)

Lat: 37.35917°NLon: 121.92417°WElev: 59.0ft.

Clear

61°F

16°C

Humidity 72%
Wind Speed N 0 MPH
Barometer 30.05 in (1017.61 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 20 Aug 05:20 AM PDT
Extended Forecast for

3 Miles E Cupertino CA

Heat Advisory August 21, 10:00am until August 22, 10:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Sunny, with a high near 89. Light north northwest wind increasing to 6 to 11 mph in the afternoon.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 61. North wind 5 to 9 mph becoming calm after midnight.

    Low: 61 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 92. Light north wind becoming north northwest 6 to 11 mph in the afternoon.

    High: 92 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 61. North wind 5 to 10 mph.

    Low: 61 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 89. North northwest wind 5 to 9 mph.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 89. Light north northwest wind increasing to 6 to 11 mph in the afternoon.
Tonight
Increasing clouds, with a low around 61. North wind 5 to 9 mph becoming calm after midnight.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 92. Light north wind becoming north northwest 6 to 11 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 61. North wind 5 to 10 mph.
Friday
Sunny, with a high near 89. North northwest wind 5 to 9 mph.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 62.
Sunday
Sunny, with a high near 85.
Sunday Night
Mostly clear, with a low around 62.
Monday
Sunny, with a high near 85.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Cupertino CA
 37.31°N 122.01°W (Elev. 197 ft)
Last Update:
1:49 am PDT Aug 20, 2025
Forecast Valid:
5am PDT Aug 20, 2025-6pm PDT Aug 26, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation