December Weather in San Sebastian, El Salvador

Last updated: August 23, 2025

In December, the average temperature in San Sebastian, El Salvador hovers around 26°C (79°F), offering a pleasant climate for outdoor activities. Expect a minimum of 17°C (64°F) and a maximum of 36°C (97°F), giving you the chance to enjoy both warm and cooler moments. With an average humidity of 66% and just 7 mm (0.3 in) of precipitation over 1 day, it's a great time to embrace the sunshine while it lasts!

December Temperature in San Sebastian

In December in San Sebastian, the average temperature is 26°C (79°F), with maximums reaching 36°C (97°F) and minimums dropping to 17°C (64°F). This pleasant weather makes San Sebastian an ideal destination for travelers seeking a warm getaway.

December Weather in San Sebastian: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in San Sebastian, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Sebastian, December typically has an average temperature of 26°C (79°F), with highs reaching up to 36°C (97°F) and lows dropping to around 17°C (64°F).

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

December Precipitation in San Sebastian

In San Sebastian in December, the precipitation amount is 7 mm (0.3 in) over the course of 1 day.

December Precipitation Trends in San Sebastian

The chart displays monthly precipitation patterns in San Sebastian, 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 San Sebastian, December typically receives around 7 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 San Sebastian

In San Sebastian in December, humidity is 66%. With an average temperature of 26°C (79°F), this humidity feels like a warm, enveloping blanket, making outdoor activities invigorating yet requiring occasional breaks in the shade to stay comfortable while traveling.

December Average Humidity in San Sebastian

This chart illustrates the average monthly humidity levels in San Sebastian, 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 San Sebastian is approximately 66%, 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 San Sebastian

In San Sebastian in December, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in San Sebastian.

Maximum UV Index Levels in San Sebastian for December

The chart shows the monthly maximum UV Index (UVI) for San Sebastian 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 San Sebastian typically reaches 9, which falls under the very high exposure category.

Data source: San Sebastian 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 San Sebastian Compares to Other Months

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

This table compares monthly weather conditions in San Sebastian, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	2 mm (0.1 inches)	63%	extreme
February Weather	27°C (81°F)	5 mm (0.2 inches)	62%	extreme
March Weather	28°C (83°F)	5 mm (0.2 inches)	59%	extreme
April Weather	28°C (83°F)	53 mm (2.1 inches)	59%	extreme
May Weather	27°C (81°F)	311 mm (12.3 inches)	59%	extreme
June Weather	26°C (79°F)	303 mm (11.9 inches)	68%	extreme
July Weather	27°C (81°F)	136 mm (5.4 inches)	77%	extreme
August Weather	27°C (80°F)	240 mm (9.5 inches)	79%	extreme
September Weather	26°C (79°F)	277 mm (10.9 inches)	77%	extreme
October Weather	26°C (78°F)	314 mm (12.3 inches)	77%	extreme
November Weather	26°C (79°F)	66 mm (2.6 inches)	75%	very high
December Weather	26°C (79°F)	7 mm (0.3 inches)	66%	very high