December weather forecast
Port Saint Lucie, FL

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A small wooden gazebo over a natural preserve in Port Saint Lucie, Florida
A small wooden gazebo over a natural preserve in Port Saint Lucie, Florida

Weather in December

December in Port Saint Lucie ushers in the winter season with a sizeable drop in temperature and sea temperatures reaching a lower 75.6°F (24.2°C). While the days are cooler, they are also less humid, and cumulatively conditions offer a comfortable climate relative to the hotter months. Despite these changes, December weather continues to encourage people to engage in numerous recreational activities, both indoor and outdoor. Notwithstanding a higher cloud coverage than previous months, December maintains a welcoming atmosphere with extended hours of sunlight. As the year closes, weather becomes gradually cooler, establishing the conditions for a temperate January.

Temperature

Port Saint Lucie's average high-temperature in December is a still warm 74.3°F (23.5°C), indicating a subtle variation from November. Throughout December, the average low-temperature records at a refreshing 63.9°F (17.7°C).

Humidity

In Port Saint Lucie, Florida, the average relative humidity in December is 77%.

Rainfall

In Port Saint Lucie, in December, during 10.9 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. In Port Saint Lucie, Florida, during the entire year, the rain falls for 181.5 days and collects up to 18.11" (460mm) of precipitation.

Ocean temperature

In Port Saint Lucie, Florida, the average seawater temperature in December is 75.6°F (24.2°C).
Note: Think about diving into 75.6°F (24.2°C) waters. Factors like your sensitivity to cold, the brightness of the sun, wind conditions, and the day's warmth play a role. For reference, Olympic swimming competitions use waters between 77°F (25°C) and 82.4°F (28°C).

Daylight

The month with the shortest days in Port Saint Lucie, Florida, is December, with an average of 10h and 30min of daylight.
On the first day of the month, sunrise is at 6:54 am and sunset at 5:26 pm. On the last day of December, sunrise is at 7:11 am and sunset at 5:38 pm EST.

Sunshine

January and December, with an average of 6.1h of sunshine, are months with the least sunshine in Port Saint Lucie.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 5 translates into these guidelines:
Ensure safety - Sun damage prevention is strongly urged. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Beware! Reflecting off water and sand, UV rays are much stronger.
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Frequently asked questions

What is the average December temperature in Port Saint Lucie?

The average high-temperature and low-temperature in Port Saint Lucie, Florida, during December are 74.3°F (23.5°C) and 63.9°F (17.7°C) respectively. In October, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, is evaluated at 87.8°F (31°C).

What is the average humidity in December in Port Saint Lucie?

The average relative humidity in December in Port Saint Lucie is 77%.

How many days does it rain in December in Port Saint Lucie?

In Port Saint Lucie, during December, the rain falls for 10.9 days and regularly aggregates up to 1.06" (27mm) of precipitation.

What is the water temperature in December in Port Saint Lucie?

In Port Saint Lucie, Florida, the average seawater temperature in December is 75.6°F (24.2°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 75.6°F (24.2°C) water.

What is the month with the shortest days in Port Saint Lucie?

December has the shortest days of the year, with an average of 10h and 30min of daylight.

What is the average length of the day in December in Port Saint Lucie?

In Port Saint Lucie, Florida, the average day length in December is 10h and 28min.

When are sunrise and sunset in December in Port Saint Lucie?

On the first day of December, sunrise is at 6:54 am and sunset at 5:26 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:38 pm EST.

What are the months with the least sunshine in Port Saint Lucie?

The months with the least sunshine in Port Saint Lucie are January and December, with an average of 6.1h of sunshine.

How long on average sun shines in December in Port Saint Lucie?

In December, the average sunshine duration is 6.1h.

What are the months with the lowest UV index in Port Saint Lucie?

January, February and December, with an average maximum UV index of 5, are months with the lowest UV index in Port Saint Lucie, Florida.

How high is the UV index in December in Port Saint Lucie?

In Port Saint Lucie, Florida, the average daily maximum UV index in December is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
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Average temperature in December
Port Saint Lucie, FL

Average temperature in December - Port Saint Lucie, FL
  • Average high temperature in December: 74.3°F

The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is January (71.2°F).

  • Average low temperature in December: 63.9°F

The month with the highest average low temperature is August (78.4°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).

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Average pressure in December
Port Saint Lucie, FL

Average pressure in December - Port Saint Lucie, FL
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).

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Average wind speed in December
Port Saint Lucie, FL

Average wind speed in December - Port Saint Lucie, FL
  • Average wind speed in December: 8.8mph

The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in December
Port Saint Lucie, FL

Average humidity in December - Port Saint Lucie, FL
  • Average humidity in December: 77%

The months with the highest relative humidity are June, July, August and September (78%).
The month with the lowest relative humidity is March (71%).

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Average rainfall in December
Port Saint Lucie, FL

Average rainfall in December - Port Saint Lucie, FL
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is August (2.99").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days in December
Port Saint Lucie, FL

Average rainfall days in December - Port Saint Lucie, FL
  • Average rainfall days in December: 10.9 days

The month with the highest number of rainy days is August (23.5 days).
The month with the least rainy days is January (8.2 days).

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Average sea temperature in December
Port Saint Lucie, FL

Average sea temperature in December - Port Saint Lucie, FL
  • Average sea temperature in December: 75.6°F

The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (73.3°F).

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Average daylight in December /
Average sunshine in December
Port Saint Lucie, FL

Average daylight in December / Average sunshine in December - Port Saint Lucie, FL
  • Average daylight in December: 10h and 3min

The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • Average sunshine in December: 6h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 6h and 6min).

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Average sunshine days in December
Port Saint Lucie, FL

Average sunshine days in December - Port Saint Lucie, FL
  • Average sunshine days in December: 16.1 days

The month with the most sunshine days is January (18.7 days).
The month with the least sunshine days is August (3.8 days).

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Average UV index in December
Port Saint Lucie, FL

Average UV index in December - Port Saint Lucie, FL
  • Average UV index in December: 5

The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February and December (UV index 5).

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Average cloud cover in December
Port Saint Lucie, FL

Average cloud cover in December - Port Saint Lucie, FL
  • Average cloud cover in December: 34

The months with the most cloud cover are November and December (Cloud cover 34).
The months with the least cloud cover are May, July and August (Cloud cover 27).

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Average visibility in December
Port Saint Lucie, FL

Average visibility in December - Port Saint Lucie, FL
  • 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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Port Saint Lucie, Florida, USA

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