The coast of Half Moon Bay is blessed with a mild climate all year round. While winter can be rainy, cloudy, and windy, the temperature rarely drops below 40 °F. The cold season lasts 3.1 months, from December 2 to March 6, with an average daily maximum temperature below 59 °F. The coldest month of the year in Half Moon Bay is January, with an average of 45 °F and a Maximum of 57°F.
At Half Moon Bay Airport, summers are short, comfortable, dry, and mostly clear, and winters are long, cold, humid, windy, and partly cloudy. Throughout the year, the temperature usually ranges from 44°F to 66°F and is rarely lower than 37°F or above 75°F. Partly cloudy at first, followed by cloudy skies during the night. Expect haze and reduced visibility on occasion.
Winds from the S of 5 to 10 miles/h. Cloudy with showers at times. S winds of 10 to 15 mph. The low temperatures in Half Moon Bay on Tuesday matched the record temperatures of the same day nearly 20 years ago, according to an announcement from the National Weather Service for the Bay Area. The average temperature in Half Moon Bay from November 1 to 29 is 50.2 °F and the second coldest temperature recorded in the same period, the 1st is the average temperature of 49.7° from November 1 to 29, 1994. The month with the least humid days at Half Moon Bay Airport is July, with an average of 0.1 days with at least 0.04 inches of precipitation.
The month of the year at Half Moon Bay airport with the warmest waters is September, with an average temperature of 58°F. According to this score, the best time of year to visit Half Moon Bay and do activities in warm climates is from early September to early October, with a maximum score in the second week of September. The United States Navy's seaplane USS Half Moon (AVP-2) during World War II was named Half Moon Bay and retained that name when it served as the USCGC Half Moon weather vessel of the United States Coast Guard for more than 20 years after the war. The topography within 2 miles of Half Moon Bay airport contains very significant variations in elevation, with a maximum elevation change of 961 feet and an average elevation above sea level of 132 feet. The month with the least rain at Half Moon Bay Airport is July, with an average rainfall of 0.0 inches.
For the 37th parallel north, Half Moon Bay's mild summer temperatures are unmatched across the board. The perceived humidity level at Half Moon Bay airport, measured by the percentage of time that the humidity comfort level is muggy, oppressive or miserable, does not vary significantly over the year, and remains practically constant at 0% throughout the year. The hottest month of the year in Half Moon Bay is August, with an average maximum of 66°F and a minimum of 55°F. The port of Pillar Point, at the northern end of Half Moon Bay, offers a protected landing for ships and provides other marine infrastructure.
For each station, the records are corrected for the elevation difference between that station and Half Moon Bay according to the International Standard Atmosphere, and for the relative change present in the MERRA-2 satellite era reanalysis between the two locations. Half Moon Bay's BestPlaces annual comfort index is 8.3 (10 = the best), which means it's more comfortable than most places in California.
