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

Significant Heat in the Northwest U.S.; Tropical Rainfall Potential in the Southwest U.S.

A significant late season heat wave continues in the interior Pacific Northwest for at least one more day before easing somewhat Friday into Saturday. A combination of monsoonal moisture and tropical moisture ahead of tropical cyclone Lorena will bring a marginal to slight risk of excessive rainfall across the southwest U.S. through Saturday which may bring areas of flooding. Read More >

Current conditions at

Mountain View, Moffett Field (KNUQ)

Lat: 37.40583°NLon: 122.04806°WElev: 33.0ft.

Overcast

63°F

17°C

Humidity 82%
Wind Speed N 5 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 04 Sep 06:15 AM PDT
Extended Forecast for

Cupertino CA

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 80. Light north northwest wind increasing to 5 to 10 mph in the afternoon.

    High: 80 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 60. North northwest wind 3 to 7 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 77. Light northwest wind increasing to 5 to 9 mph in the afternoon.

    High: 77 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59. Northwest wind 5 to 10 mph becoming light west after midnight.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 80. Calm wind becoming west northwest 5 to 9 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 80. Light north northwest wind increasing to 5 to 10 mph in the afternoon.
Tonight
Increasing clouds, with a low around 60. North northwest wind 3 to 7 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 77. Light northwest wind increasing to 5 to 9 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 59. Northwest wind 5 to 10 mph becoming light west after midnight.
Saturday
Mostly sunny, with a high near 80. Calm wind becoming west northwest 5 to 9 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 62.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 61.
Monday
Mostly sunny, with a high near 79.
Monday Night
Mostly cloudy, with a low around 61.
Tuesday
Partly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
A slight chance of rain. Mostly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cupertino CA
 37.33°N 122.04°W (Elev. 243 ft)
Last Update:
2:39 am PDT Sep 4, 2025
Forecast Valid:
6am PDT Sep 4, 2025-6pm PDT Sep 10, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation