San Francisco, CA Climate

Summary Graph

The summary climate graph for San Francisco, CA shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for San Francisco, CA.

Temperature

The warmest month in San Francisco International, San Francisco, California is September with an average high temperature of 74.9°F. The hottest day on record was June 15 2000 when the temperature hit 105.1°F. During January the overnight temperature drops to an average of 42.8°F with the lowest temperature of 23.0°F being recorded on January 2 1975.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

15 Jun 2000105.1°F
9 Sep 1984100°F
12 Sep 197999°F
13 Sep 198399°F
2 Jul 198599°F

The warmest months on average were:

September 198486.3°F
September 201081.5°F
September 198381°F
September 200479.3°F
September 197978.8°F

The coldest days on record are:

2 Jan 197523°F
23 Dec 199027°F
31 Dec 197828.9°F
1 Jan 197928.9°F
6 Dec 199829.5°F

The coldest months on average were:

January 197636.8°F
December 197837°F
January 197537.2°F
December 197637.6°F
December 199037.6°F

Rain

The wettest month by average rainfall in San Francisco, CA is January with an average of 4.4 inches of rain falling on 10 to 11 days.Although in March it typically rains on more days with 3.6 inches falling in 10 to 11 days. The driest month in San Francisco, CA is July with an average of 0.1 inches of rain falling on 2 to 3 days.

Wettest Days

The wettest days on record are:

17 September 19890.8 inches
19 September 19770.5 inches
26 September 19820.3 inches
10 September 19780.3 inches
25 September 19810.3 inches

Wettest Months

The wettest months on record are:

May 197323.2 inches
January 197320.7 inches
April 197317.4 inches
March 197314 inches
February 199813.8 inches

Driest Months

The driest months on record are:

August 19730 inches
August 19740 inches
May 19740 inches
July 19730 inches
June 19730 inches
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