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

Excessive Rainfall and Significant Flooding in the Upper Midwest This Weekend

Heavy to excessive rainfall is expected over the weekend across eastern Iowa, northern Missouri, northwest Illinois and southern Wisconsin. Numerous flash floods, some with significant impacts, are expected in these areas. Heaviest rainfall will occur overnight Saturday and Sunday, so be sure to have multiple ways to receive warnings. 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 S 5 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 55°F (13°C)
Visibility 1.00 mi
Last update 09 Aug 08:55 AM PDT
Extended Forecast for

Half Moon Bay CA

  • Today

    Today: Areas of dense fog before 10am. Otherwise, mostly sunny, with a high near 68. Southwest wind 5 to 8 mph.

    High: 68 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Tonight

    Tonight: Patchy drizzle after 11pm. Mostly cloudy, with a low around 54. Southwest wind around 6 mph becoming calm in the evening.

    Low: 54 °F

    Patchy
    Drizzle

  • Sunday

    Sunday: Patchy drizzle before 8am. Mostly sunny, with a high near 69. Calm wind becoming west southwest 5 to 7 mph in the morning.

    High: 69 °F

    Patchy
    Drizzle then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Patchy drizzle after 11pm. Mostly cloudy, with a low around 54. West southwest wind around 6 mph becoming calm in the evening.

    Low: 54 °F

    Patchy
    Drizzle

  • Monday

    Monday: Patchy drizzle before 11am. Partly sunny, with a high near 68. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 68 °F

    Patchy
    Drizzle then
    Mostly Sunny

  • Monday Night

    Monday Night: Patchy drizzle after 11pm. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Patchy
    Drizzle

  • Tuesday

    Tuesday: Patchy drizzle before 11am. Partly sunny, with a high near 66.

    High: 66 °F

    Patchy
    Drizzle then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: Patchy drizzle after 11pm. Cloudy, with a low around 56.

    Low: 56 °F

    Patchy
    Drizzle

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

Detailed Forecast

Today
Areas of dense fog before 10am. Otherwise, mostly sunny, with a high near 68. Southwest wind 5 to 8 mph.
Tonight
Patchy drizzle after 11pm. Mostly cloudy, with a low around 54. Southwest wind around 6 mph becoming calm in the evening.
Sunday
Patchy drizzle before 8am. Mostly sunny, with a high near 69. Calm wind becoming west southwest 5 to 7 mph in the morning.
Sunday Night
Patchy drizzle after 11pm. Mostly cloudy, with a low around 54. West southwest wind around 6 mph becoming calm in the evening.
Monday
Patchy drizzle before 11am. Partly sunny, with a high near 68. Calm wind becoming west 5 to 7 mph in the afternoon.
Monday Night
Patchy drizzle after 11pm. Mostly cloudy, with a low around 55.
Tuesday
Patchy drizzle before 11am. Partly sunny, with a high near 66.
Tuesday Night
Patchy drizzle after 11pm. Cloudy, with a low around 56.
Wednesday
Mostly cloudy, with a high near 64.
Wednesday Night
Cloudy, with a low around 56.
Thursday
Mostly cloudy, with a high near 63.
Thursday Night
Mostly cloudy, with a low around 55.
Friday
Partly sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Half Moon Bay CA
 37.48°N 122.42°W (Elev. 397 ft)
Last Update:
7:11 am PDT Aug 9, 2025
Forecast Valid:
9am PDT Aug 9, 2025-6pm PDT Aug 15, 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