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

Hot Temperatures in the West; Heavy Rainfall and Flooding Potential in the Southwest

Hot to extremely hot temperatures are in place across coastal southern California again today and the interior Northwest U.S into Thursday, with the Pacific Northwest carrying the potential for record-breaking high temperatures. A combination of monsoonal moisture and tropical moisture ahead of tropical cyclone Lorena will bring heavy rainfall and the potential for flooding through the week. Read More >

Current conditions at

Half Moon Bay Airport (KHAF)

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

Overcast

59°F

15°C

Humidity 100%
Wind Speed S 4 MPH
Barometer 29.99 in (1015.58 mb)
Dewpoint 59°F (15°C)
Visibility 7.00 mi
Last update 03 Sep 05:55 AM PDT
Extended Forecast for

Half Moon Bay CA

  • Today

    Today: Partly sunny, with a high near 68. South southwest wind 5 to 8 mph.

    High: 68 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of rain between 11pm and midnight, then a slight chance of drizzle after midnight. Mostly cloudy, with a low around 54. West southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 54 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: A slight chance of drizzle before 11am. Mostly cloudy, with a high near 66. Light west southwest wind becoming west 5 to 9 mph in the morning.

    High: 66 °F

    Slight Chance
    Drizzle then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: A slight chance of drizzle after 11pm. Cloudy, with a low around 57. West wind 5 to 9 mph.

    Low: 57 °F

    Slight Chance
    Drizzle

  • Friday

    Friday: Mostly cloudy, with a high near 65. West wind 5 to 10 mph.

    High: 65 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 68.

    High: 68 °F

    Patchy Fog
    then Mostly
    Sunny

Detailed Forecast

Today
Partly sunny, with a high near 68. South southwest wind 5 to 8 mph.
Tonight
A slight chance of rain between 11pm and midnight, then a slight chance of drizzle after midnight. Mostly cloudy, with a low around 54. West southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.
Thursday
A slight chance of drizzle before 11am. Mostly cloudy, with a high near 66. Light west southwest wind becoming west 5 to 9 mph in the morning.
Thursday Night
A slight chance of drizzle after 11pm. Cloudy, with a low around 57. West wind 5 to 9 mph.
Friday
Mostly cloudy, with a high near 65. West wind 5 to 10 mph.
Friday Night
Mostly cloudy, with a low around 55.
Saturday
Mostly sunny, with a high near 68.
Saturday Night
Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 57.
Sunday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 68.
Sunday Night
Mostly cloudy, with a low around 57.
Monday
Mostly cloudy, with a high near 67.
Monday Night
Mostly cloudy, with a low around 57.
Tuesday
Partly sunny, with a high near 67.
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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:
1:26 am PDT Sep 3, 2025
Forecast Valid:
6am PDT Sep 3, 2025-6pm PDT Sep 9, 2025
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation