Strong Atmospheric River Bringing Heavy Rain to the Pacific Northwest; Areas of Snow in the North-Central and Eastern U.S.

A strong atmospheric river will bring prolonged heavy rainfall along with gusty winds to the Pacific Northwest through much of this week. The heavy rainfall may lead to widespread urban and river flooding. Accumulating snow is expected over parts of the central Appalachians and Mid-Atlantic today as well as the Upper Midwest and the Upper Great Lakes this evening into Tuesday. Read More >

Current conditions at

Half Moon Bay Airport (KHAF)

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

Mist

41°F

5°C

Humidity 100%
Wind Speed N 0 MPH
Barometer 30.25 in (1024.38 mb)
Dewpoint 41°F (5°C)
Visibility 5.00 mi
Last update 08 Dec 05:55 AM PST
Extended Forecast for

Half Moon Bay CA

  • Today

    Today: Sunny, with a high near 62. Northeast wind 5 to 8 mph.

    High: 62 °F

    Sunny

  • Tonight

    Tonight: Patchy fog between midnight and 3am.  Otherwise, partly cloudy, with a low around 44. Light north wind.

    Low: 44 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Sunny, with a high near 62. North wind 5 to 8 mph.

    High: 62 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 45. Light north northeast wind.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 65. North wind 6 to 8 mph.

    High: 65 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 62. Northeast wind 5 to 8 mph.
Tonight
Patchy fog between midnight and 3am. Otherwise, partly cloudy, with a low around 44. Light north wind.
Tuesday
Sunny, with a high near 62. North wind 5 to 8 mph.
Tuesday Night
Mostly clear, with a low around 45. Light north northeast wind.
Wednesday
Sunny, with a high near 65. North wind 6 to 8 mph.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 66.
Thursday Night
Mostly clear, with a low around 47.
Friday
Sunny, with a high near 66.
Friday Night
Mostly clear, with a low around 45.
Saturday
Sunny, with a high near 63.
Saturday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 46.
Sunday
Partly sunny, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
Half Moon Bay CA
 37.48°N 122.42°W (Elev. 397 ft)
2:09 am PST Dec 8, 2025
6am PST Dec 8, 2025-6pm PST Dec 14, 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