South San Francisco (CA) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at South San Francisco

South San Francisco average temperature chart (Celsius) South San Francisco average temperature chart (Fahrenheit)
Average monthly temperatures in South San Francisco (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.2 15 15.5 16.8 18.2 20.1 21 21.3 22.2 20.6 16.5 13.4
°F 55.8 58.9 59.8 62.3 64.7 68.2 69.7 70.4 71.9 69.1 61.8 56.1

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

South San Francisco monthly rainfall chart (mm) South San Francisco monthly rainfall chart (inches)
Average monthly rainfall in South San Francisco (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 135 101 98 45 8 4 2 2 7 36 95 106
inches 5.3 4 3.9 1.8 0.3 0.2 0.1 0.1 0.3 1.4 3.8 4.2
Rainy days 10 9 11 6 3 1 1 1 2 4 8 10

Average annual rainfall in South San Francisco: 554.766mm (218.4 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in South San Francisco

South San Francisco average daily sunshine chart
Average daily sunshine South San Francisco
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.4 8 9.3 11.1 11.5 11.5 11.3 10.4 10 8.8 6.4 5.6

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

South San Francisco average minimum / maximum temperatures (Celsius) South San Francisco average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in South San Francisco (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 5.4 7.1 7.4 8 9.2 10.9 11.6 12.3 12.4 10.8 8.3 5.9
Max °C 13.4 15.2 15.7 17.1 18.4 20.4 21.2 21.6 22.4 20.9 16.8 13.6
Min °F 41.7 44.7 45.2 46.3 48.6 51.5 52.9 54.1 54.3 51.4 46.9 42.5
Max °F 48.9 52 52.7 54.5 56.8 60.1 61.5 62.4 63.3 60.4 54.5 49.5

Sea temperature

The graph below shows the average sea temperature.

South San Francisco average sea temperature chart (Celsius) South San Francisco average sea temperature chart (Fahrenheit)
Average sea temperature around South San Francisco in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 12.4 12.2 12.2 11.8 11.8 12.2 13.1 14 14.4 14.2 13.6 12.7
°F 54.2 54 53.9 53.3 53.2 53.9 55.5 57.2 57.9 57.6 56.4 54.9

Wind speed

The graph below shows the average wind speed.

South San Francisco average winspeed by month (km/h) South San Francisco average winspeed by month (mph)
Average wind speed in South San Francisco (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 12 14 17 19 21 21 20 19 17 14 13 13
mph 8 9 11 12 13 13 13 12 10 9 8 8

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

South San Francisco relative humidity averages
Average relative humidity in South San Francisco
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
78% 76% 73% 71% 70% 70% 71% 73% 71% 72% 76% 79%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

South San Francisco weather stats

South San Francisco weather statistics
Hottest month: September 22.2°C 72°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.1hrs
Coldest month: January 13.2°C 55.8°F
Wettest month: January 135mm 5.3ins
Warmest sea: September 14.4°C 57.9°F
Map showing location of South San Francisco (37.65466, -122.40775) South San Francisco map pin © Google

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