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Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Half Moon Bay Airport (KHAF)

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

Mostly Cloudy

64°F

18°C

Humidity 93%
Wind Speed NW 8 MPH
Barometer 30.08 in (1018.63 mb)
Dewpoint 63°F (17°C)
Visibility 8.00 mi
Last update 17 Aug 11:15 AM PDT
Extended Forecast for

Half Moon Bay CA

  • Today

    Today: Partly sunny, with a high near 62. West wind 9 to 11 mph.

    High: 62 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. West wind 7 to 9 mph.

    Low: 54 °F

    Mostly Cloudy

  • Monday

    Monday: Cloudy, then gradually becoming mostly sunny, with a high near 64. Light west northwest wind increasing to 5 to 9 mph in the morning.

    High: 64 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: A slight chance of drizzle between 11pm and 2am. Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 54. West northwest wind 3 to 8 mph.

    Low: 54 °F

    Slight Chance
    Drizzle and
    Patchy Fog

  • Tuesday

    Tuesday: A slight chance of drizzle before 11am. Patchy fog before 10am. Otherwise, partly sunny, with a high near 63. Light west wind becoming west northwest 5 to 9 mph in the afternoon.

    High: 63 °F

    Slight Chance
    Drizzle and
    Patchy Fog
    then Partly
    Sunny

  • 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 11am. Otherwise, partly sunny, with a high near 66.

    High: 66 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

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

    Low: 54 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 10am. Otherwise, partly sunny, with a high near 67.

    High: 67 °F

    Patchy Fog
    then Mostly
    Sunny

Detailed Forecast

Today
Partly sunny, with a high near 62. West wind 9 to 11 mph.
Tonight
Mostly cloudy, with a low around 54. West wind 7 to 9 mph.
Monday
Cloudy, then gradually becoming mostly sunny, with a high near 64. Light west northwest wind increasing to 5 to 9 mph in the morning.
Monday Night
A slight chance of drizzle between 11pm and 2am. Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 54. West northwest wind 3 to 8 mph.
Tuesday
A slight chance of drizzle before 11am. Patchy fog before 10am. Otherwise, partly sunny, with a high near 63. Light west wind becoming west northwest 5 to 9 mph in the afternoon.
Tuesday Night
Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 54.
Wednesday
Patchy fog before 11am. Otherwise, partly sunny, with a high near 66.
Wednesday Night
Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 54.
Thursday
Patchy fog before 10am. Otherwise, partly sunny, with a high near 67.
Thursday Night
Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 54.
Friday
Patchy fog. Otherwise, partly sunny, with a high near 65.
Friday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 54.
Saturday
Patchy fog. Otherwise, partly 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:
2:33 am PDT Aug 17, 2025
Forecast Valid:
11am PDT Aug 17, 2025-6pm PDT Aug 23, 2025
 
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Additional Resources

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Chance of Precipitation