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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Half Moon Bay Airport (KHAF)

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

Mist

57°F

14°C

Humidity 100%
Wind Speed N 0 MPH
Barometer 30.05 in (1017.61 mb)
Dewpoint 57°F (14°C)
Visibility 2.50 mi
Last update 19 Sep 08:35 AM PDT
Extended Forecast for

Half Moon Bay CA

  • Today

    Today: Partly sunny, with a high near 67. Light west wind becoming west northwest 5 to 9 mph in the morning.

    High: 67 °F

    Partly Sunny

  • Tonight

    Tonight: Cloudy, with a low around 54. West northwest wind 5 to 7 mph.

    Low: 54 °F

    Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 63. West wind 5 to 8 mph.

    High: 63 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Cloudy, with a low around 55. West wind 5 to 7 mph becoming calm in the evening.

    Low: 55 °F

    Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 64. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 64 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 54.

    Low: 54 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 10am. Otherwise, partly sunny, with a high near 73.

    High: 73 °F

    Patchy Fog
    then Mostly
    Sunny

Detailed Forecast

Today
Partly sunny, with a high near 67. Light west wind becoming west northwest 5 to 9 mph in the morning.
Tonight
Cloudy, with a low around 54. West northwest wind 5 to 7 mph.
Sunday
Mostly cloudy, with a high near 63. West wind 5 to 8 mph.
Sunday Night
Cloudy, with a low around 55. West wind 5 to 7 mph becoming calm in the evening.
Monday
Mostly cloudy, with a high near 64. Calm wind becoming west 5 to 7 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 54.
Tuesday
Mostly cloudy, with a high near 65.
Tuesday Night
Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 54.
Wednesday
Patchy fog before 10am. Otherwise, partly sunny, with a high near 73.
Wednesday Night
Mostly cloudy, with a low around 56.
Thursday
Mostly sunny, with a high near 75.
Thursday Night
Mostly cloudy, with a low around 56.
Friday
Partly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Half Moon Bay CA
 37.47°N 122.45°W (Elev. 7 ft)
Last Update:
9:06 am PDT Sep 19, 2026
Forecast Valid:
9am PDT Sep 19, 2026-6pm PDT Sep 25, 2026
 
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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