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

Tropical Depression Nine Forms; Heavy Rainfall in the Southwest and Southeast this Weekend

Tropical Depression Nine has formed and will continue to slowly move to the north-northwest in the coming days. As the storm passes close to the east coast of Florida, tropical storm conditions are possible Sunday through Monday. Tropical Storm Watches have been issued. Significant uncertainty remains in the track and intensity, but chances for impacts to the Southeast are increasing. Read More >

Current conditions at

Half Moon Bay Airport (KHAF)

Lat: 37.5136°NLon: 122.4996°WElev: 65.0ft.

Mist

63°F

17°C

Humidity 93%
Wind Speed S 14 MPH
Barometer 29.88 in (1011.85 mb)
Dewpoint 61°F (16°C)
Visibility 4.00 mi
Last update 27 Sep 09:35 AM PDT
Extended Forecast for

Half Moon Bay CA

  • Today

    Today: Mostly sunny, with a high near 67. South southwest wind 10 to 15 mph, with gusts as high as 18 mph.

    High: 67 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 57. South southwest wind 9 to 13 mph.

    Low: 57 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 66. South southwest wind 8 to 10 mph.

    High: 66 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Cloudy, with a low around 57. South wind 7 to 9 mph.

    Low: 57 °F

    Cloudy

  • Monday

    Monday: A 50 percent chance of rain. Cloudy, with a high near 67. South wind 7 to 13 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 67 °F

    Chance Rain

  • Monday Night

    Monday Night: A chance of rain before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of rain after 11pm. Mostly cloudy, with a low around 56. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 56 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of rain. Partly sunny, with a high near 67.

    High: 67 °F

    Slight Chance
    Rain

  • Tuesday Night

    Tuesday Night: A chance of rain, mainly after 11pm. Mostly cloudy, with a low around 58.

    Low: 58 °F

    Chance Rain

  • Wednesday

    Wednesday: A chance of rain. Mostly cloudy, with a high near 67.

    High: 67 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 67. South southwest wind 10 to 15 mph, with gusts as high as 18 mph.
Tonight
Mostly cloudy, with a low around 57. South southwest wind 9 to 13 mph.
Sunday
Mostly cloudy, with a high near 66. South southwest wind 8 to 10 mph.
Sunday Night
Cloudy, with a low around 57. South wind 7 to 9 mph.
Monday
A 50 percent chance of rain. Cloudy, with a high near 67. South wind 7 to 13 mph. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
A chance of rain before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of rain after 11pm. Mostly cloudy, with a low around 56. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 67.
Tuesday Night
A chance of rain, mainly after 11pm. Mostly cloudy, with a low around 58.
Wednesday
A chance of rain. Mostly cloudy, with a high near 67.
Wednesday Night
A slight chance of rain before 11pm. Mostly cloudy, with a low around 56.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Mostly cloudy, with a low around 55.
Friday
Mostly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Half Moon Bay CA
 37.48°N 122.42°W (Elev. 397 ft)
Last Update:
2:41 am PDT Sep 27, 2025
Forecast Valid:
9am PDT Sep 27, 2025-6pm PDT Oct 3, 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