Half Moon Bay Weather Records

Half Moon Bay, California weather averages and records from 1939–2024 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)
Month	High ☀️	Low 🌙	High ☀️	Low 🌙	Precipitation 💧	Snow ❄️
January	59.6	43.2	76	27	5.0	0.0
February	60.0	43.1	78	22	4.6	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	0.3	0.0
July	65.0	53.0	81	40	0.1	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 1939–2024
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
Greatest difference in daily high 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
Most yearly days with precipitation	166	2010
Most daily snow	none	-
Earliest freeze	November 9	2020
Earliest day ≥ 70 °F	January 4	2001
Earliest day ≥ 80 °F	March 10	2004
Latest freeze	April 30	2008
Latest day ≥ 70 °F	December 31	1963
Latest day ≥ 80 °F	November 20	2005
Most days in a year < 32 °F	18	2007
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	22 days	Dec 27, 2022 – Jan 17, 2023
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

Plant Hardiness Zone

10A

Half Moon Bay is in plant hardiness zone 10A

based on average yearly minimum temperature from 1991–2020

Half Moon Bay Weather by Year

More Half Moon Bay Weather

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Weather Station Details

Years	Station	Coordinates
1939–2024	Half Moon Bay	location