December weather forecast and climate
Half Moon Bay, CA

What is the temperature in December in Half Moon Bay?

The average high-temperature, in December, in Half Moon Bay, is 58.8°F (14.9°C), while the average low-temperature is 43.3°F (6.3°C).

How many days does it rain in December in Half Moon Bay?

In Half Moon Bay, California, in December, during 11 rainfall days, typically 4.5" (114.8mm) of precipitation is accumulated.
Average temperature in December - Half Moon Bay, CA
  • Average high temperature in December: 58.9°F

The warmest month (with the highest average high temperature) is September (66.8°F).
The month with the lowest average high temperature is January (58.4°F).

  • Average low temperature in December: 43.3°F

The month with the highest average low temperature is August (52.7°F).
The coldest month (with the lowest average low temperature) is January (42.9°F).

Average rainfall in December - Half Moon Bay, CA
  • Average rainfall in December: 4.5"

The wettest month (with the highest rainfall) is January (5.2").
The driest month (with the lowest rainfall) is July (0.1").

Average rainfall days in December - Half Moon Bay, CA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is January (12 days).
The month with the lowest number of rainy days is June (3 days).

Average daylight in December - Half Moon Bay, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).

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