Gilroy (CA) monthly weather averages

Average daytime temperature

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

Gilroy average temperature chart (Celsius) Gilroy average temperature chart (Fahrenheit)
Average monthly temperatures in Gilroy (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.5 16 16.9 19.3 22.2 25.2 27.2 27.3 26.4 23.2 17.3 13.2
°F 56.3 60.7 62.3 66.7 72 77.3 80.9 81.2 79.5 73.7 63.1 55.8

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.

Gilroy monthly rainfall chart (mm) Gilroy monthly rainfall chart (inches)
Average monthly rainfall in Gilroy (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 97 72 66 38 8 3 2 2 8 22 64 79
inches 3.8 2.8 2.6 1.5 0.3 0.1 0.1 0.1 0.3 0.9 2.5 3.1
Rainy days 9 8 9 6 2 1 1 1 2 3 7 8

Average annual rainfall in Gilroy: 374.5mm (147.4 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Gilroy

Gilroy average daily sunshine chart
Average daily sunshine Gilroy
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.1 7.9 9.5 11.3 12.1 12.4 12.3 11.4 10.7 9.4 6.7 5.4

Day / night temperatures

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

Gilroy average minimum / maximum temperatures (Celsius) Gilroy average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Gilroy (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 2.7 4.4 4.9 5.6 7.9 10.1 11.5 11.7 10.7 8.1 4.8 2.5
Max °C 13.8 16.3 17.2 19.6 22.6 25.6 27.6 27.7 26.8 23.6 17.6 13.5
Min °F 36.8 39.8 40.7 42.1 46.1 50.1 52.6 53.1 51.2 46.5 40.6 36.5
Max °F 46.8 50.5 51.8 54.7 59.4 64 67.1 67.5 65.7 60.4 52.2 46.4

Sea temperature

The graph below shows the average sea temperature.

Gilroy average sea temperature chart (Celsius) Gilroy average sea temperature chart (Fahrenheit)
Average sea temperature around Gilroy in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 12.4 12.3 12.2 12 12.1 12.7 13.7 14.6 14.9 14.6 13.8 12.9
°F 54.4 54.1 54 53.6 53.8 54.8 56.7 58.3 58.9 58.3 56.9 55.2

Wind speed

The graph below shows the average wind speed.

Gilroy average winspeed by month (km/h) Gilroy average winspeed by month (mph)
Average wind speed in Gilroy (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 12 13 16 17 18 18 17 16 14 13 12 12
mph 7 8 10 11 11 11 11 10 9 8 7 7

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.

Gilroy relative humidity averages
Average relative humidity in Gilroy
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
79% 77% 72% 67% 64% 62% 62% 64% 65% 67% 75% 80%