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San Mateo County, California · Ocean

Can you swim at Half Moon Bay State Beach today?

8.2GOOD

Good · 8.2

Water is 63 °F, measured at NDBC buoy AAMC1 (9414750 - Alameda, CA) (AAMC1). Rough waves around 3.3 ft, calm wind at 1 mph.

Updated

Swim brief

Conditions look good right now: 8.2 out of 10. Water is 63 °F, measured at NDBC buoy AAMC1 (9414750 - Alameda, CA) (AAMC1). Rough waves around 3.3 ft, calm wind at 1 mph. Air 64 °F, UV 2 (low).

Written from the readings below. Not a safety guarantee: follow lifeguards and posted signs.

The readings

  • Water temperature
    63 °F
    NDBC buoy AAMC1 (9414750 - Alameda, CA) (AAMC1) (measured) · fetched
    Good
  • Water quality
    No reading
    No classification for this spot
    –
  • Waves
    3.3 ft
    Open-Meteo Marine (model) · fetched
    Fair
  • Wind
    1 mph
    Open-Meteo Forecast (model) · fetched
    Good
  • Air temperature
    64 °F
    Open-Meteo Forecast (model) · fetched
    Good
  • UV index
    UV 2 · low
    Open-Meteo Forecast (model) · fetched
    Glass
  • Thunderstorms
    No reading
    No source reported a value
    –
  • Weather alerts
    No reading
    Weather provider does not report alerts
    Glass

Today

No hourly forecast yet

Hourly forecasts are stored for priority spots first; this one has not been fetched yet.

Questions about Half Moon Bay State Beach

Is it safe to swim at Half Moon Bay State Beach today?

Swimmable can't tell you a spot is safe; conditions change fast and no score is a guarantee. Right now its Swim Score is 8.2 out of 10 (Good), summarised from public weather, marine and water data. Check whether lifeguards are on duty and follow posted signs and flags.

What is the water temperature at Half Moon Bay State Beach?

The latest reading is 63 °F. The page shows its source and when it was fetched.

How is the Swim Score calculated?

The score out of 10 combines water temperature, air temperature, UV, wind and weather, waves and weather alerts from public sources such as NOAA, NDBC and Open-Meteo. Missing readings are left out and shown as missing, never guessed.