December Weather in Altura, Portugal

Last updated: August 27, 2025

In December, the average temperature in Altura, Portugal hovers around 13°C (55°F), with minimums dipping to 4°C (39°F) and maximums climbing to 21°C (70°F). Expect a precipitation amount of 37 mm (1.4 in) spread over 4 days, contributing to the average humidity level of around 81%.

December Temperature in Altura

In December in Altura, the average temperature is 13°C (55°F). Maximums can reach 21°C (70°F), while minimums can drop as low as 4°C (39°F). It's advisable to pack layers to stay comfortable during your travels.

December Weather in Altura: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Altura, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altura, December typically has an average temperature of 13°C (55°F), with highs reaching up to 21°C (70°F) and lows dropping to around 4°C (39°F).

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

December Precipitation in Altura

In Altura in December, the precipitation amount is 37 mm (1.4 in) over the course of 4 days.

December Precipitation Trends in Altura

The chart displays monthly precipitation patterns in Altura, 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 Altura, December typically receives around 37 mm (1.4 inches) of precipitation spread over approximately 4 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 Altura

In Altura in December, humidity is 81%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket wrapping around you, making strolls outdoors feel heavy and slightly oppressive, which may be less than ideal for travelers looking to explore comfortably.

December Average Humidity in Altura

This chart illustrates the average monthly humidity levels in Altura, 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 Altura 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 Altura

In Altura in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Altura, you can check the information here.

Maximum UV Index Levels in Altura for December

The chart shows the monthly maximum UV Index (UVI) for Altura 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 Altura typically reaches 3, which falls under the moderate exposure category.

Data source: Altura 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 Altura Compares to Other Months

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

This table compares monthly weather conditions in Altura, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	11°C (52°F)	22 mm (0.9 inches)	80%	moderate
February Weather	13°C (55°F)	38 mm (1.5 inches)	73%	moderate
March Weather	14°C (58°F)	54 mm (2.1 inches)	71%	high
April Weather	16°C (61°F)	55 mm (2.2 inches)	69%	very high
May Weather	20°C (68°F)	19 mm (0.8 inches)	69%	very high
June Weather	22°C (73°F)	5 mm (0.2 inches)	67%	extreme
July Weather	25°C (78°F)	2 mm (0.1 inches)	69%	very high
August Weather	26°C (79°F)	1 mm (0.0 inches)	68%	very high
September Weather	24°C (75°F)	19 mm (0.8 inches)	71%	very high
October Weather	20°C (68°F)	25 mm (1.0 inches)	75%	high
November Weather	15°C (59°F)	54 mm (2.1 inches)	78%	moderate
December Weather	13°C (55°F)	37 mm (1.4 inches)	81%	moderate