Low 42F. Monthly averages Half Moon Bay Longitude: -122.501, Latitude: 37.5134 Average weather Half Moon Bay, CA - 94019. Half Moon Bay, CA (94019) Today. Clear skies this evening will give way to mostly cloudy skies overnight. Climate, Climate Solutions. Find Out More. Animals. Updated: December 19, 2020 @ 7:04 am New study suggests birds increase life satisfaction. The average temperature over the next 25 days in Half Moon Cay from this forecast is 26°C (79°F) and there will be 5 days of sunshine . Half Moon Bay, CA - Weather forecast from Theweather.com. Half Moon Bay is a coastal city in San Mateo County, California, United States, approximately 25 miles (40 km) south of San Francisco.Its population was 11,324 as of the 2010 census.Immediately at the north of Half Moon Bay is Pillar Point Harbor and the unincorporated community of Princeton-by-the-Sea.The urban area had a population of 20,713 at the same census. The primary swell is predicted to be 4.0 m and 12s period with a secondary swell of 1.3 m and 8s. Long range weather outlook for Half Moon Bay includes 14 day forecast summary: Reviewing the forecast for Half Moon Bay Over the next 14 days and the average daytime maximum temperature will be around 14°C, with a high for the two weeks of 17°C expected on the afternoon of Tuesday 8th. Monthly: 1981-2010 normals The warmest day over the next 25 days weather in Half Moon Cay is forecast to be Thursday 24th December 2020 at 29°C (84°F) and the warmest night on Thursday 17th December 2020 at 23°C (73°F). Winds NNE at 5 to 10 mph.. Tonight. Half Moon Bay Live Webcam & Weather Report in Half Moon Bay, California, United States - See WorldWide Live Stream and Still Timelapse WebCams by See.Cam Man survives 10 hours in car buried in epic nor'easter snows. Best Forecast Surf Conditions for Half Moon Bay this week: The surf forecast for Half Moon Bay over the next 7 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Dec 20) at 4AM. Weather. Weather conditions with updates on temperature, humidity, wind speed, snow, pressure, etc. Winds light and variable. Station Data. for Half Moon Bay, California Plentiful sunshine. Strongest 16 January, 2019 36.9mph S; Average 2010–Present 8.5mph High near 60F. Climate (2010–Present) Half Moon Bay Airport (4.3 miles) Take a look at our website widgetsAvailable free! National Data Buoy Center - Recent observations from buoy 46012 (37.356N 122.881W) - HALF MOON BAY - 24NM SSW of San Francisco, CA. Half Moon Bay weather makes it quite comfortable throughout the year with average temperatures between 40 and 75 degrees Fahrenheit, although … NDBC - Station 46012 Recent Data weather.gov Wind, waves & weather forecast Half Moon Bay Beach / California, United States for kitesurfing, windsurfing, surfing & sailing Current conditions at Half Moon Bay Airport (KHAF) Lat: 37.5136°NLon: 122.4996°WElev: 65ft.