San Francisco Weather in 2021

Historical record of San Francisco, California weather for the year 2021 based on NOAA data.

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2021 San Francisco Weather Extremes
Highest temperature	85 °F	October 3
Lowest temperature	40 °F	January 26
Highest daily low	62 °F	September 21
Lowest daily high	48 °F	December 28
Most daily precipitation	4.0 inches	October 24
Total annual precipitation	22.7 inches	-

What was the hottest temperature in San Francisco in 2021?

The highest temperature recorded in San Francisco, California in 2021 was 85 °F which happened 3 different times.

Highest Temperatures: All-Time By Year

Highest Temperatures in San Francisco in 2021

Rank	Temperature	Date
1	85 °F	Oct 3
1	85 °F	Oct 2
1	85 °F	Oct 1
4	84 °F	Sep 21
4	84 °F	Aug 28
6	83 °F	Sep 30
6	83 °F	Sep 20
8	81 °F	Oct 16
9	80 °F	Aug 27
9	80 °F	Jun 17
9	80 °F	Mar 31

What was the coldest temperature in San Francisco in 2021?

The lowest temperature recorded in San Francisco, California in 2021 was 40 °F which happened on Jan 26.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in San Francisco in 2021

Rank	Temperature	Date
1	40 °F	January 26
2	42 °F	December 31
2	42 °F	December 30
2	42 °F	December 18
2	42 °F	January 21
6	43 °F	December 28
6	43 °F	December 26
6	43 °F	December 19
6	43 °F	December 14
6	43 °F	March 16
6	43 °F	March 11
6	43 °F	January 25

January 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
January 1	58	45	0.01
January 2	52	48	0.20
January 3	53	48	0.00
January 4	59	50	0.24
January 5	55	45	0.00
January 6	55	46	0.03
January 7	57	49	0.00
January 8	56	49	0.04
January 9	60	44	0.00
January 10	55	46	0.00
January 11	58	47	0.00
January 12	59	50	0.00
January 13	64	51	0.00
January 14	65	50	0.00
January 15	68	49	0.00
January 16	67	52	0.00
January 17	74	51	0.00
January 18	76	53	0.00
January 19	67	55	0.00
January 20	65	49	0.00
January 21	55	42	0.00
January 22	54	48	0.13
January 23	56	46	0.00
January 24	50	45	0.10
January 25	52	43	0.01
January 26	50	40	0.35
January 27	53	45	0.63
January 28	53	47	0.61
January 29	53	44	0.47
January 30	58	46	0.00
January 31	60	50	0.00

February 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
February 1	63	48	0.30
February 2	59	49	0.22
February 3	57	44	0.00
February 4	59	46	0.00
February 5	66	45	0.00
February 6	68	46	0.00
February 7	65	46	0.00
February 8	59	46	0.00
February 9	56	50	0.00
February 10	57	49	0.00
February 11	57	49	0.52
February 12	56	49	0.00
February 13	57	49	0.08
February 14	55	48	0.04
February 15	55	50	0.25
February 16	54	47	0.00
February 17	62	45	0.00
February 18	62	46	0.00
February 19	54	48	0.28
February 20	59	48	0.02
February 21	61	46	0.00
February 22	68	48	0.00
February 23	77	51	0.00
February 24	70	48	0.00
February 25	64	51	0.00
February 26	58	46	0.00
February 27	59	44	0.00
February 28	66	50	0.00

March 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
March 1	67	48	0.00
March 2	61	47	0.00
March 3	59	48	0.00
March 4	58	47	0.00
March 5	63	47	0.22
March 6	54	45	0.05
March 7	57	44	0.00
March 8	57	48	0.00
March 9	56	45	0.31
March 10	53	44	0.30
March 11	56	43	0.14
March 12	60	45	0.00
March 13	53	48	0.00
March 14	55	45	0.16
March 15	53	44	0.00
March 16	53	43	0.00
March 17	54	44	0.00
March 18	54	49	0.43
March 19	58	50	0.01
March 20	57	46	0.00
March 21	59	45	0.00
March 22	58	46	0.00
March 23	65	48	0.00
March 24	65	49	0.00
March 25	58	48	0.00
March 26	67	47	0.00
March 27	69	48	0.00
March 28	67	46	0.00
March 29	60	47	0.00
March 30	75	51	0.00
March 31	80	54	0.00

April 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
April 1	78	55	0.00
April 2	61	47	0.00
April 3	58	49	0.00
April 4	58	50	0.00
April 5	54	49	0.00
April 6	56	48	0.00
April 7	55	48	0.00
April 8	59	47	0.00
April 9	57	47	0.00
April 10	63	46	0.00
April 11	64	46	0.00
April 12	59	48	0.00
April 13	56	48	0.00
April 14	61	48	0.00
April 15	57	48	0.00
April 16	55	47	0.00
April 17	56	47	0.00
April 18	70	47	0.00
April 19	58	48	0.00
April 20	58	49	0.00
April 21	54	48	0.00
April 22	52	49	0.00
April 23	59	49	0.00
April 24	60	48	0.04
April 25	56	49	0.13
April 26	58	47	0.00
April 27	62	47	0.00
April 28	71	50	0.00
April 29	57	49	0.00
April 30	57	50	0.00

May 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
May 1	57	50	0.01
May 2	65	49	0.00
May 3	70	51	0.00
May 4	69	54	0.00
May 5	60	49	0.00
May 6	59	48	0.00
May 7	64	49	0.00
May 8	75	50	0.00
May 9	70	52	0.00
May 10	73	51	0.00
May 11	60	50	0.00
May 12	60	48	0.00
May 13	56	48	0.00
May 14	55	49	0.00
May 15	56	49	0.00
May 16	57	50	0.00
May 17	56	49	0.01
May 18	63	50	0.00
May 19	59	49	0.00
May 20	60	48	0.00
May 21	61	49	0.00
May 22	61	49	0.00
May 23	59	51	0.00
May 24	58	49	0.00
May 25	61	51	0.00
May 26	62	50	0.00
May 27	61	49	0.00
May 28	60	51	0.00
May 29	57	50	0.00
May 30	67	51	0.00
May 31	69	53	0.00

June 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	62	51	0.00
June 2	59	50	0.00
June 3	67	51	0.00
June 4	58	52	0.00
June 5	66	52	0.00
June 6	63	52	0.00
June 7	60	51	0.00
June 8	61	51	0.00
June 9	61	51	0.00
June 10	62	51	0.00
June 11	66	53	0.00
June 12	73	58	0.00
June 13	67	56	0.00
June 14	66	55	0.01
June 15	69	52	0.00
June 16	75	57	0.00
June 17	80	58	0.00
June 18	75	55	0.00
June 19	66	54	0.00
June 20	63	54	0.00
June 21	65	56	0.00
June 22	68	59	0.00
June 23	67	58	0.00
June 24	67	57	0.00
June 25	62	54	0.00
June 26	64	54	0.00
June 27	61	55	0.00
June 28	62	54	0.00
June 29	65	54	0.00
June 30	61	55	0.00

July 2021 San Francisco Weather

Day	High (°F)	Low (°F)
July 1	65	56
July 2	63	56
July 3	64	55
July 4	64	56
July 5	64	55
July 6	60	54
July 7	60	53
July 8	69	53
July 9	68	54
July 10	66	53
July 11	58	52
July 12	57	52
July 13	59	52
July 14	63	53
July 15	59	52
July 16	63	52
July 17	65	54
July 18	65	54
July 19	65	55
July 20	62	55
July 21	64	54
July 22	61	54
July 23	67	54
July 24	64	53
July 25	65	54
July 26	63	55
July 27	69	55
July 28	66	55
July 29	66	56
July 30	66	55
July 31	66	57

August 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
August 1	67	57	0.00
August 2	67	56	0.00
August 3	66	54	0.00
August 4	63	55	0.01
August 5	62	55	0.04
August 6	70	57	0.00
August 7	67	56	0.00
August 8	69	57	0.00
August 9	67	56	0.00
August 10	68	57	0.00
August 11	66	56	0.00
August 12	65	57	0.00
August 13	64	58	0.00
August 14	65	57	0.00
August 15	67	57	0.00
August 16	69	56	0.00
August 17	66	56	0.00
August 18	69	57	0.00
August 19	67	59	0.00
August 20	64	59	0.00
August 21	63	57	0.00
August 22	67	57	0.00
August 23	65	56	0.00
August 24	66	56	0.00
August 25	65	55	0.00
August 26	71	56	0.00
August 27	80	58	0.00
August 28	84	59	0.00
August 29	68	57	0.00
August 30	68	56	0.00
August 31	65	57	0.00

September 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	64	56	0.00
September 2	66	56	0.00
September 3	61	54	0.00
September 4	66	53	0.00
September 5	68	52	0.00
September 6	77	54	0.00
September 7	66	57	0.00
September 8	70	59	0.00
September 9	64	57	0.00
September 10	63	57	0.02
September 11	66	57	0.00
September 12	68	55	0.00
September 13	69	57	0.00
September 14	65	54	0.00
September 15	63	55	0.00
September 16	60	55	0.00
September 17	64	54	0.00
September 18	67	56	0.02
September 19	68	58	0.00
September 20	83	58	0.00
September 21	84	62	0.00
September 22	68	55	0.00
September 23	72	53	0.00
September 24	66	54	0.00
September 25	61	57	0.00
September 26	62	58	0.00
September 27	67	58	0.03
September 28	70	56	0.00
September 29	69	54	0.00
September 30	83	56	0.00

October 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	85	55	0.00
October 2	85	56	0.00
October 3	85	55	0.00
October 4	73	54	0.00
October 5	64	54	0.00
October 6	62	55	0.00
October 7	60	54	0.00
October 8	60	53	0.00
October 9	68	54	0.00
October 10	70	52	0.00
October 11	63	53	0.00
October 12	66	52	0.00
October 13	59	51	0.00
October 14	69	51	0.00
October 15	78	54	0.00
October 16	81	57	0.00
October 17	63	52	0.08
October 18	60	51	0.00
October 19	64	50	0.03
October 20	62	55	0.49
October 21	67	60	0.63
October 22	64	55	0.66
October 23	64	56	0.82
October 24	62	56	4.02
October 25	62	55	0.31
October 26	65	56	0.00
October 27	69	56	0.00
October 28	74	58	0.00
October 29	74	56	0.00
October 30	61	56	0.00
October 31	62	55	0.00

November 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
November 1	61	59	0.23
November 2	67	58	0.00
November 3	70	55	0.00
November 4	64	56	0.14
November 5	64	51	0.00
November 6	62	55	0.00
November 7	60	49	0.00
November 8	63	50	0.56
November 9	62	51	0.34
November 10	65	56	0.00
November 11	69	53	0.00
November 12	70	56	0.00
November 13	72	55	0.00
November 14	62	54	0.00
November 15	60	53	0.00
November 16	62	54	0.00
November 17	65	51	0.00
November 18	59	52	0.00
November 19	59	54	0.01
November 20	65	52	0.00
November 21	68	50	0.00
November 22	66	51	0.00
November 23	63	50	0.00
November 24	65	49	0.00
November 25	62	50	0.00
November 26	64	51	0.00
November 27	68	51	0.00
November 28	67	54	0.00
November 29	68	52	0.00
November 30	70	51	0.00

December 2021 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
December 1	73	55	0.00
December 2	67	52	0.00
December 3	56	51	0.00
December 4	59	52	0.00
December 5	59	50	0.00
December 6	52	48	0.01
December 7	61	51	0.03
December 8	55	51	0.00
December 9	57	49	0.01
December 10	56	44	0.00
December 11	58	44	0.00
December 12	53	48	0.60
December 13	60	44	2.57
December 14	51	43	0.21
December 15	54	44	0.50
December 16	56	49	0.25
December 17	54	44	0.00
December 18	52	42	0.00
December 19	50	43	0.00
December 20	54	45	0.00
December 21	53	44	0.16
December 22	53	46	0.67
December 23	57	52	0.83
December 24	54	48	0.09
December 25	53	44	0.60
December 26	50	43	0.24
December 27	51	44	0.53
December 28	48	43	0.00
December 29	49	44	0.61
December 30	53	42	0.00
December 31	53	42	0.00

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Weather Station Details

Years	Station	Coordinates
1921–2024	Downtown San Francisco	location