December Weather in Sandim, Portugal

Last updated: August 27, 2025

In December, the average temperature in Sandim, Portugal hovers around 11°C (51°F), making it a cool time of year. Temperatures can dip as low as 0°C (33°F) and soar up to 19°C (66°F). Be prepared for moisture, as the region receives an average of 194 mm (7.6 in) of precipitation over 14 days. With an average humidity of 87%, it's advisable to pack for a cozy and damp climate!

December Temperature in Sandim

In December, in Sandim, the average temperature is 11°C (51°F). The maximum can reach 19°C (66°F) and the minimum can be as low as 0°C (33°F). Be prepared for a cool climate, ideal for layering and exploring outdoor activities.

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

The chart illustrates December temperature patterns in Sandim, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sandim, December typically has an average temperature of 11°C (51°F), with highs reaching up to 19°C (66°F) and lows dropping to around 0°C (33°F).

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

December Precipitation in Sandim

In Sandim in December, the total precipitation amount is 194 mm (7.6 in), occurring over a span of 14 days.

December Precipitation Trends in Sandim

The chart displays monthly precipitation patterns in Sandim, 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 Sandim, December typically receives around 194 mm (7.6 inches) of precipitation spread over approximately 14 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 Sandim

In Sandim in December humidity is 87%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill wrapping around you, making outdoor excursions a bit uncomfortable as the air feels thick and heavy, urging you to seek shelter more often than not.

December Average Humidity in Sandim

This chart illustrates the average monthly humidity levels in Sandim, 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 Sandim is approximately 87%, 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 Sandim

In Sandim in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Sandim, you can visit Hourly UV Index in Sandim.

Maximum UV Index Levels in Sandim for December

The chart shows the monthly maximum UV Index (UVI) for Sandim 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 Sandim typically reaches 2, which falls under the low exposure category.

Data source: Sandim 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 Sandim Compares to Other Months

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

This table compares monthly weather conditions in Sandim, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	90 mm (3.5 inches)	87%	low
February Weather	11°C (52°F)	138 mm (5.4 inches)	81%	moderate
March Weather	12°C (53°F)	144 mm (5.7 inches)	78%	high
April Weather	14°C (57°F)	154 mm (6.1 inches)	79%	very high
May Weather	17°C (62°F)	84 mm (3.3 inches)	78%	very high
June Weather	18°C (65°F)	55 mm (2.1 inches)	71%	extreme
July Weather	20°C (69°F)	24 mm (1.0 inches)	63%	very high
August Weather	21°C (69°F)	19 mm (0.7 inches)	64%	very high
September Weather	20°C (68°F)	45 mm (1.8 inches)	71%	very high
October Weather	16°C (62°F)	120 mm (4.7 inches)	79%	high
November Weather	12°C (54°F)	164 mm (6.5 inches)	86%	moderate
December Weather	11°C (51°F)	194 mm (7.6 inches)	87%	low