December Weather in Santa Barbara, Mexico

Last updated: August 27, 2025

In Santa Barbara, Mexico, the average temperature in December is a mild 12°C (54°F). During this time, temperatures can range from a brisk -2°C (28°F) to a warm 25°C (77°F). Expect light precipitation with 8 mm (0.3 in) falling over 1 day, accompanied by a relative humidity of 81%.

December Temperature in Santa Barbara

In December in Santa Barbara, the average temperature is 12°C (54°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop as low as -2°C (28°F). It’s advisable to pack layers to prepare for fluctuating temperatures during your travels.

December Weather in Santa Barbara: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Santa Barbara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Barbara, December typically has an average temperature of 12°C (54°F), with highs reaching up to 25°C (77°F) and lows dropping to around -2°C (28°F).

Data source: Temperature data for Santa Barbara generated using information from the Copernicus Climate Change Service.

December Precipitation in Santa Barbara

In Santa Barbara in December, the precipitation amount is 8 mm (0.3 in) over the course of 1 day.

December Precipitation Trends in Santa Barbara

The chart displays monthly precipitation patterns in Santa Barbara, 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 Santa Barbara, December typically receives around 8 mm (0.3 inches) of precipitation spread over approximately 1 days.

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

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Millimeters (mm) Inches (in)

December Humidity in Santa Barbara

In Santa Barbara in December humidity is 81%. With an average temperature of 12°C (54°F), this humidity feels like a damp blanket enveloping you, making travel sluggish and uncomfortable as you battle the stickiness while trying to enjoy your surroundings.

December Average Humidity in Santa Barbara

This chart illustrates the average monthly humidity levels in Santa Barbara, 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 Santa Barbara is approximately 81%, 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 Santa Barbara

In Santa Barbara in December, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Santa Barbara.

Maximum UV Index Levels in Santa Barbara for December

The chart shows the monthly maximum UV Index (UVI) for Santa Barbara 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 Santa Barbara typically reaches 8, which falls under the very high exposure category.

Data source: Santa Barbara 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 Santa Barbara Compares to Other Months

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

This table compares monthly weather conditions in Santa Barbara, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	10 mm (0.4 inches)	74%	very high
February Weather	14°C (58°F)	13 mm (0.5 inches)	65%	extreme
March Weather	17°C (62°F)	16 mm (0.6 inches)	58%	extreme
April Weather	18°C (65°F)	9 mm (0.4 inches)	58%	extreme
May Weather	20°C (68°F)	52 mm (2.0 inches)	67%	extreme
June Weather	19°C (66°F)	180 mm (7.1 inches)	76%	extreme
July Weather	17°C (64°F)	172 mm (6.8 inches)	67%	extreme
August Weather	18°C (64°F)	133 mm (5.2 inches)	68%	extreme
September Weather	17°C (63°F)	185 mm (7.3 inches)	81%	extreme
October Weather	16°C (61°F)	75 mm (3.0 inches)	83%	extreme
November Weather	14°C (57°F)	22 mm (0.9 inches)	84%	very high
December Weather	12°C (54°F)	8 mm (0.3 inches)	81%	very high