Castro Valley (CA) monthly weather averages

Contents

Average daytime temperature

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

Castro Valley average temperature chart (Celsius) Castro Valley average temperature chart (Fahrenheit)
Average monthly temperatures in Castro Valley (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13 15.2 16.2 18.3 20.8 23.5 25.1 25 24.9 22.2 16.9 13.1
°F 55.5 59.4 61.2 65 69.5 74.3 77.2 77.1 76.8 72 62.4 55.6

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.

Castro Valley monthly rainfall chart (mm) Castro Valley monthly rainfall chart (inches)
Average monthly rainfall in Castro Valley (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 107 82 77 39 9 4 2 3 7 30 76 82
inches 4.2 3.2 3 1.5 0.4 0.1 0.1 0.1 0.3 1.2 3 3.2
Rainy days 10 9 10 6 2 1 1 1 2 4 8 9

Average annual rainfall in Castro Valley: 433.167mm (170.5 inches)

Average daily sunshine

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

Castro Valley average daily sunshine chart
Average daily sunshine Castro Valley
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.2 8 9.4 11.2 11.9 12.1 12 11 10.4 9.1 6.6 5.6

Day / night temperatures

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

Castro Valley average minimum / maximum temperatures (Celsius) Castro Valley average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Castro Valley (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 4.4 6.2 6.8 7.6 9.5 11.4 12.4 12.7 12.4 10.3 7.3 4.7
Max °C 13.3 15.5 16.5 18.6 21.1 23.8 25.5 25.4 25.2 22.5 17.1 13.3
Min °F 39.8 43.1 44.2 45.7 49.1 52.5 54.2 54.8 54.3 50.5 45.1 40.5
Max °F 47.8 51.4 52.9 55.6 59.5 63.7 66 66.2 65.8 61.5 54 48.2

Sea temperature

The graph below shows the average sea temperature.

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

Castro Valley average winspeed by month (km/h) Castro Valley average winspeed by month (mph)
Average wind speed in Castro 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 12 12
mph 8 9 10 11 12 12 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.

Castro Valley relative humidity averages
Average relative humidity in Castro Valley
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
80% 76% 72% 68% 66% 65% 65% 67% 66% 69% 76% 80%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Castro Valley weather stats

Castro Valley weather statistics
Hottest month: August 25°C 77°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.2hrs
Coldest month: January 13°C 55.4°F
Wettest month: January 107mm 4.2ins
Warmest sea: September 14.4°C 57.9°F
Map showing location of Castro Valley (37.6941, -122.08635) Castro Valley map pin © Google

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