December Weather in Port Saint Lucie, United States

Last updated: June 24, 2025

In December, the average temperature in Port Saint Lucie, United States is a pleasant 21°C (71°F). Expect a minimum of 8°C (47°F) and a maximum of 29°C (85°F), making it a comfortable time of year. During this month, you'll see about 49 mm (1.9 in) of precipitation spread over 10 days, contributing to an average humidity of 84%. Perfect for those who enjoy a mild and slightly moist climate!

December Temperature in Port Saint Lucie

In December, in Port Saint Lucie, the average temperature is 21°C (71°F), with maximums reaching 29°C (85°F) and minimums dipping as low as 8°C (47°F). This pleasant climate makes Port Saint Lucie an ideal destination for travelers seeking mild weather and enjoyable outdoor activities.

December Weather in Port Saint Lucie: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Port Saint Lucie, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Saint Lucie, December typically has an average temperature of 21°C (71°F), with highs reaching up to 29°C (85°F) and lows dropping to around 8°C (47°F).

Data source: Temperature data for Port Saint Lucie generated using information from the Copernicus Climate Change Service.

December Precipitation in Port Saint Lucie

In Port Saint Lucie in December, the total precipitation amount is 49 mm (1.9 in) over the course of 10 days.

December Precipitation Trends in Port Saint Lucie

The chart displays monthly precipitation patterns in Port Saint Lucie, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Port Saint Lucie, December typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Port Saint Lucie

In Port Saint Lucie in December, humidity is 84%. With an average temperature of 21°C (71°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and sluggish, making outdoor adventures a bit more challenging but also invigorating in the right moments.

December Average Humidity in Port Saint Lucie

This chart illustrates the average monthly humidity levels in Port Saint Lucie, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Port Saint Lucie is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Port Saint Lucie

In Port Saint Lucie in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Port Saint Lucie.

Maximum UV Index Levels in Port Saint Lucie for December

The chart shows the monthly maximum UV Index (UVI) for Port Saint Lucie in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Port Saint Lucie typically reaches 5, which falls under the moderate exposure category.

Data source: Port Saint Lucie December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Port Saint Lucie Compares to Other Months

Weather in Port Saint Lucie varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Port Saint Lucie, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Port Saint Lucie, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	20°C (68°F)	38 mm (1.5 inches)	83%	high
February Weather	22°C (72°F)	43 mm (1.7 inches)	80%	very high
March Weather	22°C (72°F)	31 mm (1.2 inches)	75%	very high
April Weather	24°C (76°F)	65 mm (2.6 inches)	68%	extreme
May Weather	26°C (79°F)	122 mm (4.8 inches)	65%	extreme
June Weather	27°C (81°F)	159 mm (6.3 inches)	73%	extreme
July Weather	28°C (83°F)	140 mm (5.5 inches)	77%	extreme
August Weather	28°C (83°F)	175 mm (6.9 inches)	80%	extreme
September Weather	28°C (82°F)	148 mm (5.8 inches)	83%	extreme
October Weather	27°C (80°F)	126 mm (5.0 inches)	83%	very high
November Weather	23°C (75°F)	81 mm (3.2 inches)	83%	high
December Weather	21°C (71°F)	49 mm (1.9 inches)	84%	moderate