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

Heavy Rain and Flooding Concerns in Hawaii; Severe Weather in the Plains

A storm system is expected to bring strong winds, widespread heavy rainfall, and flooding concerns to the Hawaiian Islands through the weekend. Strong to severe thunderstorms are forecast from the Southern Plains to the Mid-Missouri Valley Thursday afternoon and evening. Large hail and strong winds are the primary threats. Read More >

Current conditions at

Half Moon Bay Airport (KHAF)

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

Mist

55°F

13°C

Humidity 100%
Wind Speed SSE 3 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 55°F (13°C)
Visibility 2.00 mi
Last update 09 Apr 07:15 AM PDT
Extended Forecast for

Half Moon Bay CA

  • Today

    Today: Areas of fog before 10am. Otherwise, partly sunny, with a high near 66. Calm wind becoming south southwest 5 to 8 mph in the afternoon.

    High: 66 °F

    Areas Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: A chance of rain before 2am, then a chance of showers and thunderstorms between 2am and 5am, then rain after 5am. Low around 51. South southwest wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 51 °F

    Chance Rain
    then Showers

  • Friday

    Friday: Rain before 8am, then showers and possibly a thunderstorm after 8am. High near 64. South wind 5 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then rain likely after 11pm. Mostly cloudy, with a low around 50. South southwest wind 7 to 9 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Showers
    Likely

  • Saturday

    Saturday: Rain, mainly before 2pm, then showers and possibly a thunderstorm after 2pm. High near 61. South southwest wind 8 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 61 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 2am, then rain after 2am. Low around 44. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 44 °F

    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 59. Chance of precipitation is 80%.

    High: 59 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

  • Monday

    Monday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

Detailed Forecast

Today
Areas of fog before 10am. Otherwise, partly sunny, with a high near 66. Calm wind becoming south southwest 5 to 8 mph in the afternoon.
Tonight
A chance of rain before 2am, then a chance of showers and thunderstorms between 2am and 5am, then rain after 5am. Low around 51. South southwest wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Rain before 8am, then showers and possibly a thunderstorm after 8am. High near 64. South wind 5 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of showers and thunderstorms, then rain likely after 11pm. Mostly cloudy, with a low around 50. South southwest wind 7 to 9 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Rain, mainly before 2pm, then showers and possibly a thunderstorm after 2pm. High near 61. South southwest wind 8 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm before 2am, then rain after 2am. Low around 44. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers and possibly a thunderstorm. High near 59. Chance of precipitation is 80%.
Sunday Night
A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 45.
Monday
Mostly sunny, with a high near 62.
Monday Night
Mostly clear, with a low around 46.
Tuesday
Mostly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
Mostly sunny, with a high near 64.
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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 Apr 9, 2026
Forecast Valid:
7am PDT Apr 9, 2026-6pm PDT Apr 15, 2026
 
Forecast Discussion
 
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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