San Rafael (CA) monthly weather averages

Average daytime temperature

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

San Rafael average temperature chart (Celsius) San Rafael average temperature chart (Fahrenheit)
Average monthly temperatures in San Rafael (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.2 15.1 15.6 17 18.5 20.4 21.7 21.9 22.6 21.1 16.7 13.3
°F 55.8 59.2 60 62.6 65.3 68.8 71 71.5 72.6 70 62 55.9

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.

San Rafael monthly rainfall chart (mm) San Rafael monthly rainfall chart (inches)
Average monthly rainfall in San Rafael (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 208 149 130 62 13 6 2 3 11 54 141 168
inches 8.2 5.9 5.1 2.4 0.5 0.2 0.1 0.1 0.4 2.1 5.6 6.6
Rainy days 10 9 11 7 3 1 1 1 2 4 9 10

Average daily sunshine

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

San Rafael average daily sunshine chart
Average daily sunshine San Rafael
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.4 7.9 9.2 11 11.5 11.5 11.3 10.4 10 8.7 6.4 5.6

Day / night temperatures

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

San Rafael average minimum / maximum temperatures (Celsius) San Rafael average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in San Rafael (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 5 6.5 6.6 7.2 8.5 9.9 10.7 11.2 11.4 10 7.5 5.4
Max °C 13.5 15.4 15.8 17.3 18.8 20.7 22 22.2 22.9 21.4 16.9 13.5
Min °F 40.9 43.6 43.9 44.9 47.2 49.8 51.2 52.2 52.4 50 45.5 41.6
Max °F 48.6 51.6 52.2 54 56.5 59.5 61.3 62.1 62.8 60.3 54 48.9

Sea temperature

The graph below shows the average sea temperature.

San Rafael average sea temperature chart (Celsius) San Rafael average sea temperature chart (Fahrenheit)
Average sea temperature around San Rafael 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.

San Rafael average winspeed by month (km/h) San Rafael average winspeed by month (mph)
Average wind speed in San Rafael (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 12 14 17 18 20 20 19 18 16 14 13 12
mph 8 9 10 11 13 13 12 11 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.

San Rafael relative humidity averages
Average relative humidity in San Rafael
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
79% 77% 73% 70% 70% 69% 70% 72% 70% 71% 76% 80%

Other monthly averages

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San Rafael weather stats

San Rafael weather statistics
Hottest month: September 22.6°C 72.7°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11hrs
Coldest month: January 13.2°C 55.8°F
Wettest month: January 208mm 8.2ins
Warmest sea: September 14.4°C 57.9°F
Map showing location of San Rafael (37.97353, -122.53109)

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