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Half Moon Bay Weather Records

Half Moon Bay, California weather averages and records from 1939–2022 based on data made available by the NOAA.
All-Time Recorded High
The highest temperature ever recorded in Half Moon Bay, California was 94 °F which occurred on October 27, 2003.
Highest Temperatures: All-Time By Year
All-Time Recorded Low
The lowest temperature ever recorded in Half Moon Bay, California was 19 °F which occurred on December 23, 1990.
Lowest Temperatures: All-Time By Year
Half Moon Bay Weather by Month
Averages based on the years 1991–2020
Month Average (°F) Record (°F) Average (inches)
High ☀️ Low 🌙 High ☀️ Low 🌙 Precipitation 💧 Snow ❄️
January 59.6 43.2 76 27 5.0 0.0
February 60.0 43.1 78 22 4.7 0.0
March 60.5 43.8 83 28 3.5 0.0
April 61.2 44.7 84 31 1.8 0.0
May 62.2 48.1 82 33 1.0 0.0
June 63.8 50.2 89 36 0.4 0.0
July 65.0 53.0 81 40 0.2 0.0
August 65.9 53.9 88 41 0.2 0.0
September 66.5 51.5 92 35 0.2 0.0
October 66.4 48.0 94 33 1.3 0.0
November 62.5 44.6 87 30 2.5 0.0
December 59.5 42.8 79 19 4.7 0.0
Entire year 62.8 47.3 94 19 25.3 0.0
More Half Moon Bay Weather Records
1939–2022
Highest daily low 70 °F September 19, 1983
Lowest daily high 37 °F December 9, 1972
Greatest daily range
(Difference of high and low)
48 °F March 31, 2000
Difference in high temperature
over two conscutive days
27 °F Sep 7–8, 1944
Most daily precipitation 5.5 inches December 16, 2002
Most monthly precipitation 15.7 inches February 1998
Most yearly precipitation 52.3 inches 1983
Earliest freeze November 9 2020
Latest freeze April 30 2008
Most daily snow none -
Most days in a year ≥ 80 °F 10 1966
Most days in a year ≥ 90 °F 3 2003
Half Moon Bay Weather Streaks
Most consecutive days...
With precipitation 20 days Feb 26 – Mar 17, 2006
Without precipitation 168 days May 1 – Oct 15, 1978
High temperature ≥ 80 °F 5 days Oct 21–25, 1965
High temperature ≥ 90 °F 3 days Oct 25–27, 2003
Half Moon Bay Weather by Year
More
Weather Station Details
Years Station Coordinates
1939–2022 Half Moon Bay location