December weather forecast and climate
Morro Bay, CA

The iconic Morro Rock, a famous tourist spot in Morro Bay, California
The iconic Morro Rock, a famous tourist spot in Morro Bay, California

Weather in December

December, the first month of the winter, in Morro Bay, is also a moderate month, with average temperature ranging between min 48°F (8.9°C) and max 59.2°F (15.1°C).

Temperature

With an average high-temperature of 59.2°F (15.1°C) and an average low-temperature of 48°F (8.9°C), December is the coldest month.

Humidity

The average relative humidity in Morro Bay is 66%.

Rainfall

In Morro Bay, it is raining for 7.3 days, with typically 1.38" (35mm) of accumulated precipitation. In Morro Bay, California, during the entire year, the rain falls for 53.7 days and collects up to 8.58" (218mm) of precipitation.

Ocean temperature

In December, the average ocean temperature in Morro Bay is 57.6°F (14.2°C).
Note: Swimming in 57.6°F (14.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

The month with the shortest days in Morro Bay is December, with an average of 9.8h of daylight.

Sunshine

The month with the least sunshine in Morro Bay is December, with an average of 6.4h of sunshine.

UV index

January through April, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Morro Bay. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Morro Bay?

The coldest month is December, with an average high-temperature of 59.2°F (15.1°C) and an average low-temperature of 48°F (8.9°C).

What is the temperature in December in Morro Bay?

The average high-temperature, in December, in Morro Bay, California, is 59.2°F (15.1°C), while the average low-temperature is 48°F (8.9°C).

What is the average humidity in December in Morro Bay?

The average relative humidity in December in Morro Bay is 66%.

How much does it rain in Morro Bay in December?

In Morro Bay, California, in December, it is raining for 7.3 days, with typically 1.38" (35mm) of accumulated precipitation.

How cold is the water in December in Morro Bay?

In Morro Bay, California, the average seawater temperature in December is 57.6°F (14.2°C). Swimming in 57.6°F (14.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Morro Bay?

The month with the shortest days in Morro Bay, California, is December, with an average of 9.8h of daylight.

How many hours of daylight does Morro Bay have in December?

The average length of the day in December in Morro Bay, California, is 9.8h.

What is the month with the least sunshine in Morro Bay?

December has the least sunshine of the year, with an average of 6.4h of sunshine.

How many hours of sunshine does Morro Bay have in December?

In Morro Bay, the average sunshine in December is 6.4h.

What are the months with the lowest UV index in Morro Bay?

January through April, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Morro Bay, California.

What is the UV index intensity in December in Morro Bay?

The average daily maximum UV index in December is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in December
Morro Bay, CA

Average temperature in December - Morro Bay, CA
  • Average high temperature in December: 59.2°F

The warmest month (with the highest average high temperature) is September (76.3°F).
The month with the lowest average high temperature is December (59.2°F).

  • Average low temperature in December: 48°F

The month with the highest average low temperature is September (59.9°F).
The coldest month (with the lowest average low temperature) is February (47.3°F).

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Average pressure in December
Morro Bay, CA

Average pressure in December - Morro Bay, CA
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is January (30.12").
Months with the lowest atmospheric pressure are June and September (29.91").

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Average wind speed in December
Morro Bay, CA

Average wind speed in December - Morro Bay, CA
  • Average wind speed in December: 6.8mph

The windiest month (with the highest average wind speed) is May (7.9mph).
The calmest months (with the lowest average wind speed) are August and September (6mph).

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Average humidity in December
Morro Bay, CA

Average humidity in December - Morro Bay, CA
  • Average humidity in December: 66%

The month with the highest relative humidity is March (70%).
Months with the lowest relative humidity are September and October (61%).

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Average rainfall in December
Morro Bay, CA

Average rainfall in December - Morro Bay, CA
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is January (1.81").
The driest month (with the least rainfall) is August (0.04").

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Average rainfall days in December
Morro Bay, CA

Average rainfall days in December - Morro Bay, CA
  • Average rainfall days in December: 7.3 days

The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.7 days).

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Average sea temperature in December
Morro Bay, CA

Average sea temperature in December - Morro Bay, CA
  • Average sea temperature in December: 57.5°F

The best months for swimming (with the highest average sea temperature) are August and October (58.6°F).
The coldest month (with the lowest average sea temperature) is April (54.3°F).

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Average daylight in December /
Average sunshine in December
Morro Bay, CA

Average daylight in December / Average sunshine in December - Morro Bay, CA
  • Average daylight in December: 9.8h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in December: 6.4h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.4h).

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Average sunshine days in December
Morro Bay, CA

Average sunshine days in December - Morro Bay, CA
  • Average sunshine days in December: 22.5 days

The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is February (20.1 days).

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Average UV index in December
Morro Bay, CA

Average UV index in December - Morro Bay, CA
  • Average UV index in December: 4

The month with the highest UV index is August (UV index 6).
Months with the lowest UV index are January, February, March, April, November and December (UV index 4).

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Average cloud cover in December
Morro Bay, CA

Average cloud cover in December - Morro Bay, CA
  • Average cloud cover in December: 26

The month with the most cloud cover is March (Cloud cover 28).
Months with the least cloud cover are August and September (Cloud cover 7).

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Average visibility in December
Morro Bay, CA

Average visibility in December - Morro Bay, CA
  • Average visibility in December: 6mi

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

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