San Francisco Weather in 2018

Historical record of San Francisco, California weather for the year 2018 based on NOAA data.

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2018 San Francisco Weather Extremes
Highest temperature	83 °F	September 20
Lowest temperature	40 °F	February 23
Highest daily low	63 °F	October 7
Lowest daily high	51 °F	February 26
Most daily precipitation	3.2 inches	January 8
Total annual precipitation	19.9 inches	-

What was the hottest temperature in San Francisco in 2018?

The highest temperature recorded in San Francisco, California in 2018 was 83 °F which happened on September 20.

Highest Temperatures: All-Time By Year

Highest Temperatures in San Francisco in 2018

Rank	Temperature	Date
1	83 °F	Sep 20
2	81 °F	Nov 1
2	81 °F	Oct 15
2	81 °F	Mar 29
5	80 °F	Jun 23
6	79 °F	Oct 8
6	79 °F	Oct 7
6	79 °F	Mar 30
9	78 °F	Oct 12
9	78 °F	Oct 2
9	78 °F	Jun 2

What was the coldest temperature in San Francisco in 2018?

The lowest temperature recorded in San Francisco, California in 2018 was 40 °F which happened 2 different times.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in San Francisco in 2018

Rank	Temperature	Date
1	40 °F	February 23
1	40 °F	February 20
3	41 °F	February 24
3	41 °F	February 19
5	42 °F	March 4
6	43 °F	February 25
6	43 °F	February 21
6	43 °F	January 20
9	44 °F	March 25
9	44 °F	March 5
9	44 °F	March 3
9	44 °F	March 2
9	44 °F	February 27
9	44 °F	February 26
9	44 °F	February 22
9	44 °F	February 18

January 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
January 1	61	48	0.00
January 2	61	52	0.00
January 3	58	53	0.09
January 4	63	53	0.06
January 5	61	52	0.26
January 6	59	50	0.00
January 7	52	48	0.00
January 8	58	51	3.15
January 9	59	51	0.32
January 10	56	50	0.04
January 11	60	52	0.00
January 12	59	50	0.00
January 13	63	47	0.00
January 14	58	49	0.00
January 15	62	49	0.00
January 16	60	54	0.02
January 17	59	53	0.00
January 18	56	50	0.43
January 19	57	48	0.02
January 20	57	43	0.00
January 21	57	45	0.02
January 22	58	50	0.30
January 23	58	46	0.00
January 24	58	48	0.42
January 25	58	46	0.08
January 26	56	45	0.00
January 27	60	45	0.00
January 28	66	47	0.00
January 29	63	52	0.00
January 30	65	50	0.00
January 31	67	50	0.00

February 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
February 1	71	53	0.00
February 2	73	54	0.00
February 3	74	54	0.00
February 4	74	57	0.00
February 5	77	54	0.00
February 6	75	54	0.00
February 7	71	55	0.00
February 8	74	54	0.00
February 9	76	54	0.00
February 10	68	52	0.00
February 11	61	48	0.00
February 12	57	47	0.00
February 13	63	50	0.00
February 14	58	47	0.00
February 15	63	46	0.00
February 16	65	46	0.00
February 17	67	48	0.00
February 18	53	44	0.00
February 19	51	41	0.00
February 20	52	40	0.00
February 21	55	43	0.00
February 22	52	44	0.01
February 23	52	40	0.00
February 24	54	41	0.00
February 25	58	43	0.00
February 26	51	44	0.20
February 27	56	44	0.00
February 28	n/a	n/a	n/a

March 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
March 1	58	46	0.83
March 2	53	44	0.18
March 3	53	44	0.07
March 4	55	42	0.00
March 5	61	44	0.00
March 6	66	47	0.00
March 7	69	53	0.02
March 8	60	49	0.05
March 9	60	47	0.00
March 10	58	47	0.00
March 11	69	47	0.00
March 12	67	49	0.27
March 13	61	49	0.55
March 14	58	48	0.15
March 15	56	45	0.65
March 16	54	45	0.16
March 17	57	45	0.03
March 18	56	45	0.00
March 19	64	47	0.00
March 20	59	51	0.77
March 21	64	53	0.35
March 22	60	48	0.32
March 23	58	46	0.00
March 24	55	46	0.07
March 25	55	44	0.07
March 26	61	45	0.00
March 27	68	53	0.00
March 28	76	52	0.00
March 29	81	55	0.00
March 30	79	56	0.00
March 31	60	51	0.00

April 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
April 1	65	51	0.00
April 2	63	51	0.00
April 3	59	49	0.00
April 4	60	51	0.00
April 5	61	52	0.14
April 6	61	56	2.22
April 7	62	54	1.07
April 8	61	50	0.00
April 9	74	52	0.00
April 10	63	52	0.00
April 11	60	49	0.14
April 12	57	48	0.00
April 13	63	49	0.00
April 14	68	52	0.00
April 15	60	50	0.21
April 16	55	45	0.13
April 17	61	45	0.00
April 18	57	49	0.00
April 19	60	47	0.00
April 20	65	49	0.00
April 21	71	49	0.00
April 22	72	49	0.00
April 23	70	52	0.00
April 24	59	51	0.00
April 25	58	49	0.00
April 26	58	51	0.00
April 27	63	52	0.00
April 28	63	53	0.00
April 29	61	52	0.00
April 30	60	50	0.00

May 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
May 1	62	49	0.00
May 2	60	50	0.00
May 3	58	51	0.00
May 4	62	50	0.00
May 5	57	50	0.00
May 6	59	52	0.00
May 7	66	52	0.00
May 8	59	52	0.00
May 9	62	53	0.00
May 10	66	52	0.00
May 11	69	52	0.00
May 12	69	53	0.00
May 13	61	53	0.00
May 14	58	52	0.00
May 15	63	54	0.00
May 16	63	53	0.00
May 17	62	53	0.00
May 18	60	52	0.00
May 19	59	52	0.00
May 20	59	52	0.00
May 21	61	50	0.00
May 22	57	51	0.00
May 23	59	53	0.04
May 24	61	53	0.00
May 25	63	54	0.00
May 26	63	53	0.00
May 27	70	52	0.00
May 28	77	55	0.00
May 29	69	52	0.00
May 30	58	51	0.00
May 31	60	51	0.00

June 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	68	50	0.00
June 2	78	53	0.00
June 3	73	54	0.00
June 4	64	52	0.00
June 5	63	50	0.00
June 6	60	51	0.00
June 7	61	52	0.00
June 8	64	52	0.00
June 9	63	54	0.01
June 10	65	52	0.00
June 11	67	54	0.00
June 12	71	55	0.00
June 13	75	53	0.00
June 14	64	53	0.00
June 15	59	53	0.00
June 16	67	53	0.00
June 17	66	55	0.00
June 18	63	54	0.00
June 19	60	53	0.00
June 20	59	52	0.00
June 21	69	51	0.00
June 22	71	53	0.00
June 23	80	55	0.00
June 24	73	55	0.00
June 25	64	55	0.00
June 26	64	53	0.00
June 27	58	54	0.00
June 28	66	54	0.00
June 29	71	53	0.00
June 30	68	55	0.00

July 2018 San Francisco Weather

Day	High (°F)	Low (°F)
July 1	62	55
July 2	63	55
July 3	68	54
July 4	64	54
July 5	68	53
July 6	73	59
July 7	67	56
July 8	67	54
July 9	74	55
July 10	77	55
July 11	68	55
July 12	66	56
July 13	68	57
July 14	64	56
July 15	65	55
July 16	65	55
July 17	65	55
July 18	66	55
July 19	66	55
July 20	71	57
July 21	66	59
July 22	68	58
July 23	65	57
July 24	65	56
July 25	64	55
July 26	61	54
July 27	59	53
July 28	65	52
July 29	61	52
July 30	61	52
July 31	61	52

August 2018 San Francisco Weather

Day	High (°F)	Low (°F)
August 1	61	52
August 2	63	52
August 3	71	53
August 4	68	55
August 5	66	53
August 6	69	51
August 7	59	51
August 8	68	53
August 9	72	53
August 10	66	53
August 11	69	57
August 12	67	57
August 13	61	54
August 14	63	55
August 15	67	58
August 16	66	57
August 17	65	54
August 18	66	52
August 19	64	54
August 20	61	54
August 21	64	55
August 22	67	58
August 23	66	59
August 24	66	56
August 25	65	55
August 26	66	55
August 27	68	56
August 28	68	57
August 29	71	58
August 30	68	58
August 31	66	56

September 2018 San Francisco Weather

Day	High (°F)	Low (°F)
September 1	64	55
September 2	65	55
September 3	65	56
September 4	66	56
September 5	62	56
September 6	61	55
September 7	66	55
September 8	69	56
September 9	70	54
September 10	73	55
September 11	69	54
September 12	63	54
September 13	65	55
September 14	65	54
September 15	62	53
September 16	66	55
September 17	62	55
September 18	64	54
September 19	68	52
September 20	83	57
September 21	64	54
September 22	61	53
September 23	66	53
September 24	66	50
September 25	64	53
September 26	74	53
September 27	60	51
September 28	65	55
September 29	70	58
September 30	70	61

October 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	72	59	0.00
October 2	78	61	0.21
October 3	71	61	0.00
October 4	68	57	0.00
October 5	66	55	0.00
October 6	69	58	0.00
October 7	79	63	0.00
October 8	79	58	0.00
October 9	65	55	0.00
October 10	64	54	0.00
October 11	66	54	0.00
October 12	78	54	0.00
October 13	64	55	0.00
October 14	64	55	0.00
October 15	81	57	0.00
October 16	71	54	0.00
October 17	69	53	0.00
October 18	65	53	0.00
October 19	72	52	0.00
October 20	64	52	0.00
October 21	60	52	0.00
October 22	61	54	0.00
October 23	62	54	0.00
October 24	66	54	0.00
October 25	72	54	0.00
October 26	72	55	0.00
October 27	67	56	0.00
October 28	67	56	0.00
October 29	67	56	0.00
October 30	68	54	0.00
October 31	75	54	0.00

November 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
November 1	81	59	0.00
November 2	73	56	0.00
November 3	76	56	0.00
November 4	67	53	0.00
November 5	70	53	0.00
November 6	76	53	0.00
November 7	74	52	0.00
November 8	71	56	0.00
November 9	68	53	0.00
November 10	62	48	0.00
November 11	69	49	0.00
November 12	69	50	0.00
November 13	63	52	0.00
November 14	65	49	0.00
November 15	63	49	0.00
November 16	66	50	0.00
November 17	57	48	0.00
November 18	61	49	0.00
November 19	65	48	0.00
November 20	65	49	0.00
November 21	59	55	0.91
November 22	62	55	0.69
November 23	60	55	0.59
November 24	59	54	0.04
November 25	65	53	0.00
November 26	65	51	0.00
November 27	59	53	0.34
November 28	63	57	0.66
November 29	60	54	0.33
November 30	61	52	0.00

December 2018 San Francisco Weather

Day	High (°F)	Low (°F)	Precip. (inches)
December 1	57	50	0.21
December 2	57	45	0.00
December 3	57	49	0.00
December 4	55	51	0.03
December 5	55	49	0.29
December 6	60	52	0.00
December 7	61	49	0.00
December 8	59	49	0.00
December 9	53	48	0.00
December 10	57	49	0.01
December 11	59	46	0.00
December 12	61	51	0.00
December 13	62	49	0.00
December 14	62	51	0.04
December 15	62	53	0.00
December 16	60	53	0.73
December 17	60	51	0.01
December 18	62	50	0.00
December 19	60	53	0.00
December 20	55	50	0.00
December 21	58	53	0.09
December 22	59	47	0.00
December 23	59	50	0.02
December 24	58	51	0.75
December 25	60	47	0.00
December 26	59	47	0.00
December 27	59	47	0.00
December 28	60	48	0.00
December 29	60	45	0.00
December 30	59	46	0.00
December 31	56	47	0.00

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Weather Station Details

Years	Station	Coordinates
1921–2024	Downtown San Francisco	location