Half Moon Bay Weather in 2009

Historical record of Half Moon Bay, California weather for the year 2009 based on NOAA data.

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2009 Half Moon Bay Weather Extremes
Highest temperature	84 °F	August 28
Lowest temperature	28 °F	December 8
Highest daily low	61 °F	January 13
Lowest daily high	49 °F	December 10
Most daily precipitation	2.9 inches	October 13
Most daily snow	none	-
Total annual precipitation	21.6 inches	-
Total annual snow	none	-

What was the hottest temperature in Half Moon Bay in 2009?

The highest temperature recorded in Half Moon Bay, California in 2009 was 84 °F which happened on August 28.

Highest Temperatures: All-Time By Year

Highest Temperatures in Half Moon Bay in 2009

Rank	Temperature	Date
1	84 °F	Aug 28
2	80 °F	Oct 1
2	80 °F	Aug 29
4	79 °F	Oct 16
5	78 °F	Nov 2
6	76 °F	Sep 2
6	76 °F	Jan 14
8	75 °F	Nov 3
8	75 °F	Jul 13
8	75 °F	Apr 21
8	75 °F	Jan 17
8	75 °F	Jan 15

What was the coldest temperature in Half Moon Bay in 2009?

The lowest temperature recorded in Half Moon Bay, California in 2009 was 28 °F which happened 2 different times.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in Half Moon Bay in 2009

Rank	Temperature	Date
1	28 °F	December 8
1	28 °F	January 4
3	31 °F	December 10
3	31 °F	December 6
5	32 °F	December 9
5	32 °F	April 4
5	32 °F	March 23
5	32 °F	March 10
5	32 °F	January 3
10	33 °F	November 17
10	33 °F	April 2
10	33 °F	February 10
10	33 °F	January 28
10	33 °F	January 27
10	33 °F	January 26

January 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
January 1	58	44	0.01
January 2	54	46	0.06
January 3	52	32	0.10
January 4	52	28	0.00
January 5	53	36	0.01
January 6	50	43	0.04
January 7	58	43	0.00
January 8	60	45	0.01
January 9	60	34	0.01
January 10	62	43	0.01
January 11	66	41	0.00
January 12	73	47	0.00
January 13	74	61	0.00
January 14	76	60	0.00
January 15	75	48	0.00
January 16	72	41	0.00
January 17	75	43	0.00
January 18	72	46	0.00
January 19	71	58	0.00
January 20	72	55	0.00
January 21	72	50	0.00
January 22	67	52	0.51
January 23	58	52	0.10
January 24	60	51	0.23
January 25	56	48	0.01
January 26	55	33	0.07
January 27	55	33	0.00
January 28	60	33	0.00
January 29	62	37	0.00
January 30	68	43	0.00
January 31	69	39	0.00

February 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
February 1	60	35	0.00
February 2	71	45	0.00
February 3	69	45	0.00
February 4	68	38	0.00
February 5	60	46	0.12
February 6	60	50	0.13
February 7	55	46	0.15
February 8	62	40	0.01
February 9	57	40	0.53
February 10	54	33	0.00
February 11	54	38	0.25
February 12	56	40	0.23
February 13	55	40	0.60
February 14	55	40	0.47
February 15	57	44	0.63
February 16	51	44	2.76
February 17	55	46	0.58
February 18	58	40	0.10
February 19	59	41	0.00
February 20	64	38	0.00
February 21	66	40	0.00
February 22	66	48	0.54
February 23	57	52	1.15
February 24	61	46	0.28
February 25	60	44	0.08
February 26	61	50	0.14
February 27	58	39	0.01
February 28	56	44	0.00

March 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
March 1	71	51	0.15
March 2	64	52	0.44
March 3	61	38	0.75
March 4	62	44	0.19
March 5	60	43	0.47
March 6	56	41	0.13
March 7	56	40	0.00
March 8	58	41	0.00
March 9	56	44	0.00
March 10	54	32	0.00
March 11	58	35	0.00
March 12	58	45	0.00
March 13	58	49	0.00
March 14	57	43	0.00
March 15	56	49	0.12
March 16	61	51	0.13
March 17	64	50	0.05
March 18	60	41	0.00
March 19	65	43	0.00
March 20	60	50	0.00
March 21	56	50	0.00
March 22	60	44	0.22
March 23	54	32	0.01
March 24	55	34	0.00
March 25	58	40	0.00
March 26	58	36	0.00
March 27	58	39	0.00
March 28	61	38	0.00
March 29	58	40	0.00
March 30	58	41	0.00
March 31	65	34	0.00

April 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
April 1	60	42	0.00
April 2	57	33	0.00
April 3	56	38	0.00
April 4	55	32	0.00
April 5	62	34	0.00
April 6	67	40	0.00
April 7	63	42	0.12
April 8	66	49	0.23
April 9	62	48	0.02
April 10	58	47	0.04
April 11	57	49	0.00
April 12	58	47	0.00
April 13	59	50	0.00
April 14	57	47	0.00
April 15	54	38	0.00
April 16	55	45	0.00
April 17	56	40	0.00
April 18	62	41	0.00
April 19	55	39	0.00
April 20	68	45	0.00
April 21	75	49	0.00
April 22	n/a	44	0.00
April 23	65	51	0.00
April 24	60	50	0.00
April 25	57	48	0.00
April 26	56	48	0.00
April 27	57	48	0.00
April 28	58	46	0.00
April 29	59	41	0.00
April 30	59	36	0.00

May 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
May 1	62	45	0.00
May 2	63	51	0.25
May 3	62	54	0.06
May 4	59	51	0.12
May 5	62	54	0.60
May 6	64	52	0.06
May 7	63	50	0.02
May 8	63	40	0.00
May 9	61	41	0.00
May 10	60	43	0.00
May 11	60	47	0.00
May 12	59	49	0.00
May 13	60	40	0.00
May 14	61	45	0.00
May 15	61	50	0.25
May 16	58	42	0.01
May 17	65	44	0.00
May 18	68	49	0.00
May 19	58	49	0.01
May 20	61	38	0.00
May 21	60	46	0.00
May 22	60	49	0.00
May 23	58	49	0.00
May 24	55	49	0.00
May 25	54	49	0.00
May 26	57	41	0.00
May 27	60	41	0.00
May 28	61	51	0.00
May 29	63	52	0.00
May 30	62	53	0.00
May 31	62	52	0.01

June 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	60	53	0.00
June 2	63	51	0.02
June 3	64	49	0.00
June 4	65	54	0.03
June 5	67	54	0.00
June 6	68	47	0.00
June 7	69	48	0.00
June 8	67	56	0.00
June 9	65	56	0.00
June 10	69	56	0.06
June 11	69	56	0.00
June 12	68	56	0.00
June 13	68	55	0.04
June 14	69	49	0.00
June 15	70	46	0.00
June 16	67	57	0.00
June 17	64	57	0.00
June 18	65	56	0.00
June 19	66	47	0.00
June 20	n/a	n/a	0.00
June 21	64	52	0.00
June 22	63	41	0.00
June 23	n/a	n/a	0.00
June 24	67	42	0.00
June 25	65	54	0.00
June 26	63	52	0.00
June 27	n/a	n/a	0.00
June 28	68	46	0.00
June 29	65	51	0.00
June 30	68	55	0.00

July 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
July 1	70	55	0.00
July 2	68	54	0.00
July 3	68	56	0.00
July 4	69	55	0.00
July 5	68	56	0.00
July 6	67	55	0.00
July 7	66	55	0.00
July 8	65	53	0.00
July 9	64	53	0.00
July 10	64	54	0.00
July 11	65	53	0.00
July 12	65	52	0.00
July 13	75	53	0.01
July 14	73	44	0.01
July 15	65	48	0.00
July 16	63	50	0.01
July 17	63	51	0.00
July 18	62	48	0.00
July 19	n/a	n/a	0.00
July 20	64	53	0.00
July 21	61	52	0.00
July 22	60	53	0.01
July 23	60	52	0.01
July 24	65	53	0.04
July 25	62	52	0.02
July 26	61	52	0.02
July 27	61	50	0.00
July 28	65	54	0.00
July 29	68	56	0.05
July 30	67	56	0.02
July 31	65	54	0.01

August 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
August 1	65	54	0.01
August 2	67	55	0.00
August 3	69	55	0.05
August 4	69	57	0.01
August 5	71	49	0.00
August 6	70	58	0.09
August 7	70	56	0.00
August 8	68	56	0.00
August 9	67	48	0.00
August 10	69	47	0.00
August 11	66	55	0.01
August 12	71	56	0.00
August 13	68	53	0.00
August 14	68	47	0.00
August 15	66	55	0.00
August 16	65	50	0.00
August 17	64	50	0.00
August 18	63	54	0.00
August 19	67	55	0.00
August 20	68	57	0.00
August 21	68	55	0.00
August 22	63	49	0.00
August 23	63	55	0.00
August 24	63	54	0.00
August 25	64	53	0.00
August 26	65	52	0.00
August 27	n/a	n/a	0.00
August 28	84	49	0.00
August 29	80	51	0.00
August 30	67	54	0.00
August 31	68	54	0.00

September 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	64	54	0.00
September 2	76	48	0.00
September 3	72	45	0.00
September 4	67	45	0.00
September 5	69	55	0.01
September 6	67	53	0.04
September 7	67	48	0.01
September 8	66	44	0.00
September 9	65	53	0.01
September 10	63	47	0.00
September 11	64	50	0.00
September 12	62	54	0.01
September 13	68	56	0.02
September 14	69	57	0.34
September 15	69	52	0.01
September 16	67	53	0.00
September 17	70	57	0.01
September 18	73	49	0.01
September 19	72	51	0.01
September 20	65	52	0.00
September 21	64	51	0.01
September 22	63	52	0.01
September 23	63	54	0.00
September 24	61	53	0.00
September 25	61	51	0.00
September 26	65	49	0.00
September 27	69	46	0.01
September 28	69	54	0.02
September 29	63	53	0.00
September 30	64	39	0.00

October 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	80	37	0.00
October 2	71	38	0.00
October 3	64	49	0.00
October 4	59	50	0.00
October 5	63	37	0.00
October 6	63	36	0.00
October 7	63	37	0.00
October 8	63	52	0.00
October 9	63	52	0.00
October 10	61	50	0.00
October 11	62	49	0.00
October 12	65	53	0.00
October 13	65	56	2.86
October 14	69	58	0.02
October 15	71	58	0.00
October 16	79	54	0.00
October 17	69	55	0.01
October 18	66	55	0.00
October 19	68	53	0.03
October 20	64	49	0.10
October 21	63	53	0.00
October 22	64	53	0.00
October 23	65	45	0.01
October 24	65	47	0.00
October 25	65	43	0.01
October 26	64	44	0.01
October 27	62	46	0.00
October 28	62	53	0.00
October 29	n/a	n/a	0.00
October 30	61	36	0.00
October 31	64	49	0.00

November 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
November 1	72	45	0.01
November 2	78	48	0.00
November 3	75	44	0.00
November 4	68	44	0.00
November 5	67	48	0.01
November 6	65	54	0.14
November 7	60	40	0.01
November 8	61	40	0.00
November 9	60	35	0.01
November 10	67	45	0.00
November 11	61	48	0.00
November 12	58	47	0.00
November 13	57	36	0.00
November 14	57	44	0.03
November 15	56	34	0.00
November 16	58	34	0.01
November 17	57	33	0.00
November 18	57	39	0.04
November 19	63	35	0.00
November 20	58	35	0.08
November 21	55	36	0.00
November 22	55	35	0.01
November 23	64	41	0.01
November 24	70	45	0.00
November 25	67	41	0.00
November 26	60	39	0.00
November 27	56	47	0.08
November 28	68	48	0.00
November 29	70	52	0.00
November 30	62	36	0.00

December 2009 Half Moon Bay Weather

Day	High (°F)	Low (°F)	Precip. (inches)
December 1	60	41	0.00
December 2	51	42	0.00
December 3	60	37	0.00
December 4	53	39	0.01
December 5	54	34	0.00
December 6	53	31	0.00
December 7	51	38	0.40
December 8	49	28	0.01
December 9	50	32	0.00
December 10	49	31	0.02
December 11	56	40	0.37
December 12	59	51	0.55
December 13	58	51	0.30
December 14	56	42	0.02
December 15	60	41	0.00
December 16	58	48	0.12
December 17	63	50	0.01
December 18	66	47	0.00
December 19	65	48	0.00
December 20	62	47	0.00
December 21	58	49	0.13
December 22	55	46	0.08
December 23	59	37	0.00
December 24	62	34	0.00
December 25	62	38	0.00
December 26	60	36	0.00
December 27	57	46	0.41
December 28	57	47	0.00
December 29	55	34	0.00
December 30	56	46	0.23
December 31	60	46	0.00

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Weather Station Details

Years	Station	Coordinates
1939–2024	Half Moon Bay	location