Santa Monica
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Santa Monica, CA

A night view of the neon-lit fun park in Santa Monica, California, with a view of the iconic Ferris wheel and pier, all reflected in the seawater below
A night view of the neon-lit fun park in Santa Monica, California, with a view of the iconic Ferris wheel and pier, all reflected in the seawater below
December, the first month of the winter, in Santa Monica, is still a comfortable month, with average temperature ranging between min 51.1°F (10.6°C) and max 64°F (17.8°C).

Temperature

In December, the average high-temperature is almost the same as in November - a still comfortable 64°F (17.8°C). The average low-temperature, in December, is 51.1°F (10.6°C).

Rainfall

In Santa Monica, during 4 rainfall days, 1.9" (47.8mm) of precipitation is typically accumulated. In Santa Monica, during the entire year, the rain falls for 32.7 days and collects up to 12.8" (324.9mm) of precipitation.

Ocean temperature

January through May and December, with an average ocean temperature of 59°F (15°C), are months with the coldest seawater.
Note: For swimming, a surface water temperature of 59°F (15°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

December has the shortest days of the year in Santa Monica, with an average of 9.9h of daylight.

Sunshine

January, November and December, with an average of 7h of sunshine, are months with the least sunshine in Santa Monica.

UV index

January and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in December in Santa Monica?

The average high-temperature, in December, in Santa Monica, California, is 64°F (17.8°C), while the average low-temperature is 51.1°F (10.6°C).

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

In Santa Monica, California, in December, during 4 rainfall days, 1.9" (47.8mm) of precipitation is typically accumulated.

When is the ocean coldest in Santa Monica?

Through, May and December, with an average ocean temperature of 59°F (15°C).

What is the ocean temperature in December in Santa Monica?

In Santa Monica, California, the average seawater temperature in December is 59°F (15°C). For swimming, a surface water temperature of 59°F (15°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

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

The month with the shortest days is December, with an average of 9.9h of daylight.

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

In December, the average length of the day in Santa Monica is 9.9h.

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

January, November and December, with an average of 7h of sunshine, are months with the least sunshine.

How long on average sun shines in December in Santa Monica?

In December, the average sunshine is 7h.

What are the months with the lowest UV index in Santa Monica?

January and December, with an average maximum UV index of 3, are months with the lowest UV index in Santa Monica, California.

What is the UV index reading in December in Santa Monica?

In Santa Monica, California, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in December - Santa Monica, CA
  • Average high temperature in December: 64°F

Warmest months (with the highest average high temperature) are August and September (71°F).
Months with the lowest average high temperature are February and March (63°F).

  • Average low temperature in December: 51°F

Months with the highest average low temperature are July, August and September (63°F).
Coldest months (with the lowest average low temperature) are January and December (51°F).

Average rainfall in December - Santa Monica, CA
  • Average rainfall in December: 1.9"

The wettest month (with the highest rainfall) is February (3.4").
Driest months (with the lowest rainfall) are June, July and August (0").

Average rainfall days in December - Santa Monica, CA
  • Average rainfall days in December: 4 days

The month with the highest number of rainy days is February (7.9 days).
The month with the lowest number of rainy days is July (0.1 days).

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

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

Average daylight in December / Average sunshine in December - Santa Monica, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 7h

The month with most sunshine is July (Average sunshine: 12h).
Months with least sunshine are January, November and December (Average sunshine: 7).

Average UV index in December - Santa Monica, CA
  • Average UV index in December: 3

The month with the highest UV index is July (UV index 11).
Months with the lowest UV index are January and December (UV index 3).