HALF MOON BAY - 24NM SSW of San Francisco, CA (46012) — Live Marine Conditions & Buoy Data
NOAA station 46012, HALF MOON BAY - 24NM SSW of San Francisco, CA, reports real-time marine conditions from 37.356°N, 122.881°W in the eastern North Pacific (California). Readings refresh roughly every 10 minutes, and Big Buoy adds 7-day tide predictions, a solunar table, and a multi-day weather outlook for the area.
Monterey Bay Marine Conditions — HALF MOON BAY - 24NM SSW of San Francisco, CA is one of several stations in Monterey Bay. See live tides, buoy data, and solunar for the whole area.
Current conditions at HALF MOON BAY - 24NM SSW of San Francisco, CA
As of October 19, 2026 at 18:00 UTC, HALF MOON BAY - 24NM SSW of San Francisco, CA (46012) is reporting water temperature 62°F, air temperature 59°F, wave height 6.2 ft at a 13-second dominant period, wind from the NW at 9 mph gusting 11 mph, and barometric pressure 30.00 inHg.
- Water temperature
- 62°F
- Air temperature
- 59°F
- Wave height
- 6.2 ft @ 13 s
- Wind
- NW 9 mph (gust 11)
- Barometric pressure
- 30.00 inHg
Observed October 19, 2026 at 18:00 UTC from NOAA NDBC station 46012. Readings update about every 10 minutes.
What NOAA buoy 46012 measures
As a NOAA meteorological station, 46012 reports wind speed, gusts and direction, barometric pressure, air and water temperature, and — where wave sensors are fitted — significant wave height, swell period, and wave direction.
What to watch in the eastern North Pacific
The U.S. Pacific coast is dominated by long-period groundswell and strong seasonal upwelling that keeps nearshore water cold. Watch swell period as closely as wave height — a long-period west swell can make harbor entrances and bar crossings hazardous even when the wave height looks modest.
Frequently asked questions
- What is the water temperature at Half Moon Bay?
- Sea surface temperature at Half Moon Bay was 62°F. Measured October 19, 2026 at 18:00 UTC by NOAA station 46012 (HALF MOON BAY - 24NM SSW of San Francisco, CA). NDBC measures this near the surface, at a depth that varies by station.
- What is the air temperature at Half Moon Bay?
- Air temperature at Half Moon Bay was 59°F. Measured October 19, 2026 at 18:00 UTC by NOAA station 46012 (HALF MOON BAY - 24NM SSW of San Francisco, CA).
- What is the wind doing at Half Moon Bay?
- Wind at Half Moon Bay was from the NW at 9 mph, with peak gusts to 11 mph. Measured October 19, 2026 at 18:00 UTC by NOAA station 46012 (HALF MOON BAY - 24NM SSW of San Francisco, CA). NDBC records wind at the station’s anemometer height, which is not the 10 m height used in marine forecasts.
- How big are the waves at Half Moon Bay?
- Significant wave height at Half Moon Bay was 6.2 ft, with a 13-second dominant period. Measured October 19, 2026 at 18:00 UTC by NOAA station 46012 (HALF MOON BAY - 24NM SSW of San Francisco, CA). Significant wave height is the average of the highest one-third of waves — individual waves can be larger.
- What is the barometric pressure at Half Moon Bay?
- Sea-level pressure at Half Moon Bay was 30.00 inHg (1016 hPa). Measured October 19, 2026 at 18:00 UTC by NOAA station 46012 (HALF MOON BAY - 24NM SSW of San Francisco, CA). NDBC reports pressure reduced to sea level rather than the raw reading at the station.
- Where is NOAA buoy 46012 located?
- HALF MOON BAY - 24NM SSW of San Francisco, CA (46012) reports from 37.356°N, 122.881°W in the eastern North Pacific (California).
- How often is NOAA buoy 46012 updated?
- Station 46012 typically reports new observations about every 10 minutes. Big Buoy refreshes continuously so you always see the latest readings, alongside 7-day tide predictions and a solunar table for the area.
- What does NOAA buoy 46012 measure?
- Big Buoy shows wind, barometric pressure, air and water temperature, and wave height and period where available for HALF MOON BAY - 24NM SSW of San Francisco, CA, plus 7-day tides, solunar peak windows, and a multi-day weather outlook.
- Is Big Buoy free to use?
- Yes. Live data for HALF MOON BAY - 24NM SSW of San Francisco, CA and every other NOAA buoy is free with no account required. Big Buoy Pro adds the Wind Tab, the Depth Chart, satellite overlays (sea surface temp, chlorophyll, currents), 16-day forecasts, and forecast model switching.