Portola Valley (CA) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Portola Valley

Portola Valley average temperature chart (Celsius) Portola Valley average temperature chart (Fahrenheit)
Average monthly temperatures in Portola Valley (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.3 15 15.6 17.4 19.3 21.7 23 23.3 23.5 21.3 16.7 13.3
°F 56 59.1 60.1 63.3 66.8 71.1 73.4 74 74.2 70.4 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.

Portola Valley monthly rainfall chart (mm) Portola Valley monthly rainfall chart (inches)
Average monthly rainfall in Portola Valley (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 133 103 98 45 9 4 2 2 7 35 92 102
inches 5.2 4.1 3.9 1.8 0.4 0.1 0.1 0.1 0.3 1.4 3.6 4
Rainy days 10 9 10 6 3 1 1 1 2 4 8 9

Average annual rainfall in Portola Valley: 547.267mm (215.5 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Portola Valley

Portola Valley average daily sunshine chart
Average daily sunshine Portola Valley
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.3 7.9 9.3 11.1 11.5 11.5 11.3 10.4 10 8.9 6.5 5.6

Day / night temperatures

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

Portola Valley average minimum / maximum temperatures (Celsius) Portola Valley average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Portola Valley (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 4.3 6 6.4 7.2 8.8 10.6 11.7 12.2 11.9 9.8 6.9 4.5
Max °C 13.6 15.3 15.9 17.7 19.6 22 23.3 23.6 23.8 21.6 16.9 13.5
Min °F 39.7 42.7 43.4 44.9 47.8 51.1 53.1 54 53.3 49.6 44.4 40.1
Max °F 48 51.1 52 54.3 57.6 61.3 63.5 64.2 64 60.3 53.4 48.2

Sea temperature

The graph below shows the average sea temperature.

Portola Valley average sea temperature chart (Celsius) Portola Valley average sea temperature chart (Fahrenheit)
Average sea temperature around Portola Valley 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.

Portola Valley average winspeed by month (km/h) Portola Valley average winspeed by month (mph)
Average wind speed in Portola Valley (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 13
mph 8 9 11 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.

Portola Valley relative humidity averages
Average relative humidity in Portola Valley
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
79% 76% 73% 70% 69% 68% 70% 71% 70% 71% 76% 79%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Portola Valley weather stats

Portola Valley weather statistics
Hottest month: August 23.3°C 73.9°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.1hrs
Coldest month: January 13.3°C 55.9°F
Wettest month: January 133mm 5.2ins
Warmest sea: September 14.4°C 57.9°F
Map showing location of Portola Valley (37.38411, -122.23524) Portola Valley map pin © Google

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