San Francisco Weather in October

San Francisco, California basks in warm, sunny weather during October. This is the city's second hottest month of the year.

This page gives detailed information on the typical October temperature, precipitation, sun, humidity, wind and storms for San Francisco.

The temperature, rainfall, sunshine and wind speed numbers here are historical averages based on climate data gathered in downtown San Francisco near the corner of Buchanan and Hermann Streets. The rest of the measurements are averages at the San Francisco International Airport, located south of the city center.

Temperature Weather iconTemperature

69 °F October average high 21 °C
54 °F October average low 12 °C

In most years, San Francisco averages a daily maximum temperature for October that's between 67 and 71 degrees Fahrenheit (19 to 22 degrees Celsius). The minimum temperature usually falls between 53 and 55 °F (12 to 13 °C).

The days at San Francisco start to cool down during October. By the end of the month, the temperature has dropped around 3 °F (2 °C) below what it was at the start.

12 days 70 °F max. or more (21 °C)
3 days 50 °F min. or less (10 °C)

Nearly every October day warms to over 60 °F (16 °C) in San Francisco. The city averages 4 days this month when the thermometer reaches into the 80s °F (over 27 °C). In some years it gets as hot as 90 °F (32 °C) during October.

Usually the thermometer dips to 60 °F (16 °C) or below every night this month. But October does not normally get as cold as 40 °F (4 °C).

Rainy Weather iconRain

1.1 in total precipitation 28 mm
4 days of rain

Half the time, San Francisco receives 0.3 to 1.8 inches (8 to 46 mm) of rainfall in October. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

70 % sunshine
16 days clear skies

The sun's rays reach the ground in San Francisco during 70 percent of daylight hours on average in October, for a total of 243 hours in the month. Typically on 16 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in October at San Francisco lasts for 11 hours and 11 minutes a day on average. The longest day of the month is the 1st with 11 hours and 47 minutes of daylight. By the end of the month, the days have shortened to 10:37 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

72 % October average humidity

The relative humidity in San Francisco during October usually peaks at 82 percent in the morning then drops to 55 percent by early afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 80 82 82 68 55 59 72 77

Windy Weather iconWind

7.6 mph October wind speed average 12.2 kph

October is less windy than most other months in San Francisco.

Stormy Weather iconStorms

1 day rainfall of 0.5 inches (13 mm) or more
0 days with thunderstorms in October

San Francisco has a heavy October rainstorm in many, but not all years.

About once in five years, an October thunderstorm passes through San Francisco.

Reference

These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

San Francisco Weather
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