Half Moon Bay (CA) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Half Moon Bay

Half Moon Bay average temperature chart (Celsius) Half Moon Bay average temperature chart (Fahrenheit)
Average monthly temperatures in Half Moon Bay (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.4 15 15.4 17 18.5 20.5 21.6 22 22.5 20.7 16.7 13.4
°F 56.1 59 59.8 62.5 65.3 68.9 70.8 71.5 72.5 69.3 62 56.2

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.

Half Moon Bay monthly rainfall chart (mm) Half Moon Bay monthly rainfall chart (inches)
Average monthly rainfall in Half Moon Bay (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 146 112 107 48 9 4 2 2 7 38 102 114
inches 5.7 4.4 4.2 1.9 0.4 0.2 0.1 0.1 0.3 1.5 4 4.5
Rainy days 10 9 11 6 3 1 1 1 2 4 8 10

Average annual rainfall in Half Moon Bay: 605.6mm (238.4 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Half Moon Bay

Half Moon Bay average daily sunshine chart
Average daily sunshine Half Moon Bay
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6.4 7.9 9.3 11 11.4 11.4 11.2 10.3 9.9 8.8 6.4 5.6

Day / night temperatures

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

Half Moon Bay average minimum / maximum temperatures (Celsius) Half Moon Bay average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Half Moon Bay (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 4.8 6.4 6.8 7.4 8.9 10.5 11.4 12 11.9 10 7.5 5.2
Max °C 13.6 15.2 15.7 17.2 18.8 20.8 21.8 22.2 22.8 21 16.9 13.7
Min °F 40.6 43.5 44.2 45.3 47.9 50.8 52.5 53.6 53.3 50 45.5 41.3
Max °F 48.6 51.4 52.2 54.1 56.8 60.1 61.9 62.8 63.1 59.9 54 48.9

Sea temperature

The graph below shows the average sea temperature.

Half Moon Bay average sea temperature chart (Celsius) Half Moon Bay average sea temperature chart (Fahrenheit)
Average sea temperature around Half Moon Bay 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.

Half Moon Bay average winspeed by month (km/h) Half Moon Bay average winspeed by month (mph)
Average wind speed in Half Moon Bay (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.

Half Moon Bay relative humidity averages
Average relative humidity in Half Moon Bay
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
78% 76% 73% 71% 71% 70% 72% 74% 71% 72% 76% 79%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Half Moon Bay weather stats

Half Moon Bay weather statistics
Hottest month: September 22.5°C 72.5°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11hrs
Coldest month: January 13.4°C 56.1°F
Wettest month: January 146mm 5.7ins
Warmest sea: September 14.4°C 57.9°F
Map showing location of Half Moon Bay (37.46355, -122.42859) Half Moon Bay map pin © Google

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