December weather forecast
Santa Monica, CA

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The neon-lit fun park in Santa Monica, California, with a view of the iconic Ferris wheel and pier
The neon-lit fun park in Santa Monica, California, with a view of the iconic Ferris wheel and pier

Weather in December

December, the first month of the winter in Santa Monica, is also an enjoyable month, with an average temperature ranging between min 50.7°F (10.4°C) and max 63.9°F (17.7°C).

Temperature

Santa Monica's coldest month, December, registers temperatures that range from a high of 63.9°F (17.7°C) to a low of 50.7°F (10.4°C).

Humidity

In December, the average relative humidity is 55%.

Rainfall

In Santa Monica, California, during December, the rain falls for 5.2 days and regularly aggregates up to 1.26" (32mm) of precipitation. In Santa Monica, California, during the entire year, the rain falls for 48.8 days and collects up to 7.52" (191mm) of precipitation.

Ocean temperature

The months with the coldest seawater in Santa Monica are January through May and December, with an average ocean temperature of 59°F (15°C).
Note: The majority of individuals find it unpleasurable to swim in 59°F (15°C). It becomes progressively harder to manage one's breathing as the water temperature falls below 69.8°F (21°C).

Daylight

The month with the shortest days is December, with an average of 9h and 54min of daylight.
On the first day of December in Santa Monica, sunrise is at 6:41 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 4:55 pm PST.

Sunshine

February and December, with an average of 6.6h of sunshine, are months with the least sunshine in Santa Monica.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 4 in December transforms into the following instructions:
Undertake protective steps - Preventing sun damage is advised. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
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Frequently asked questions

What part of the year is the coldest in Santa Monica?

Santa Monica, California, experiences its lowest temperatures in December, with an average peak of 63.9°F (17.7°C) and a low of 50.7°F (10.4°C).

What is the usual temperature for Santa Monica in December?

In December, in Santa Monica, the average high-temperature is 63.9°F (17.7°C), and the average low-temperature is 50.7°F (10.4°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is estimated at 82.4°F (28°C).

What is the average humidity in December in Santa Monica?

The average relative humidity in December is 55%.

How many days does it rain in December in Santa Monica?

In Santa Monica, California, during December, the rain falls for 5.2 days and regularly aggregates up to 1.26" (32mm) of precipitation.

What months are the ocean coldest in Santa Monica?

January through May and December, with an average ocean temperature of 59°F (15°C), are months with the coldest seawater in Santa Monica, California.

What is the ocean temperature in December in Santa Monica?

In Santa Monica, California, in December, the average water temperature is 59°F (15°C). For most, swimming in 59°F (15°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the month with the shortest days in Santa Monica?

December has the shortest days of the year in Santa Monica, California, with an average of 9h and 54min of daylight.

How many hours of daylight does Santa Monica have in December?

In December, the average day length in Santa Monica, California, is 9h and 56min.

When are sunrise and sunset in December in Santa Monica?

In December, on the first day of the month, sunrise is at 6:41 am and sunset at 4:44 pm. On the last day of the month, in Santa Monica, California, sunrise is at 6:59 am and sunset at 4:55 pm PST.

What is the month with the least sunshine in Santa Monica?

February and December, with an average of 6.6h of sunshine, are months with the least sunshine in Santa Monica, California.

How many hours of sunshine does Santa Monica have in December?

The average sunshine duration in December in Santa Monica is 6.6h.

When is the lowest UV index in Santa Monica?

The months with the lowest UV index in Santa Monica are January, February, November and December, with an average maximum UV index of 4.

How high is the UV index in December in Santa Monica?

The average daily maximum UV index in December in Santa Monica is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Santa Monica, CA

Average temperature in December - Santa Monica, CA
  • Average high temperature in December: 63.9°F

The warmest month (with the highest average high temperature) is August (80.8°F).
The month with the lowest average high temperature is December (63.9°F).

  • Average low temperature in December: 50.7°F

The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is February (50.5°F).

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Average pressure in December
Santa Monica, CA

Average pressure in December - Santa Monica, CA
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.9"Hg).

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Average wind speed in December
Santa Monica, CA

Average wind speed in December - Santa Monica, CA
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest months (with the lowest average wind speed) are August and September (4.8mph).

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Average humidity in December
Santa Monica, CA

Average humidity in December - Santa Monica, CA
  • Average humidity in December: 55%

The month with the highest relative humidity is June (69%).
The month with the lowest relative humidity is November (52%).

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Average rainfall in December
Santa Monica, CA

Average rainfall in December - Santa Monica, CA
  • Average rainfall in December: 1.26"

The wettest month (with the highest rainfall) is January (1.54").
The driest months (with the least rainfall) are June and August (0.08").

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Average rainfall days in December
Santa Monica, CA

Average rainfall days in December - Santa Monica, CA
  • Average rainfall days in December: 5.2 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is August (1.8 days).

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Average sea temperature in December
Santa Monica, CA

Average sea temperature in December - Santa Monica, CA
  • Average sea temperature in December: 59°F

The best months for swimming (with the highest average sea temperature) are August, September and October (66°F).
The coldest months (with the lowest average sea temperature) are January, February, March, April, May and December (59°F).

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Average daylight in December /
Average sunshine in December
Santa Monica, CA

Average daylight in December / Average sunshine in December - Santa Monica, CA
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 6h and 4min

The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The months with the least sunshine are February and December (Average sunshine: 6h and 36min).

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Average sunshine days in December
Santa Monica, CA

Average sunshine days in December - Santa Monica, CA
  • Average sunshine days in December: 24.1 days

The month with the most sunshine days is August (27.9 days).
The month with the least sunshine days is February (21.8 days).

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Average UV index in December
Santa Monica, CA

Average UV index in December - Santa Monica, CA
  • Average UV index in December: 4

The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in December
Santa Monica, CA

Average cloud cover in December - Santa Monica, CA
  • Average cloud cover in December: 23

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in December
Santa Monica, CA

Average visibility in December - Santa Monica, CA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Santa Monica, California, USA

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