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December Weather in Castro Marim, Portugal

Last updated: August 27, 2025

In December, the average temperature in Castro Marim, 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 Castro Marim

In December in Castro Marim, 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 Castro Marim: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Castro Marim, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castro Marim, 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).
JanFebMarAprMayJunJulAugSepOctNovDec515557616872777975685955
Data source: Temperature data for Castro Marim generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Castro Marim

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

December Precipitation Trends in Castro Marim

The chart displays monthly precipitation patterns in Castro Marim, 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 Castro Marim, December typically receives around 37 mm (1.4 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec223854552052119255437
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castro Marim

In Castro Marim 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 Castro Marim

This chart illustrates the average monthly humidity levels in Castro Marim, 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 Castro Marim is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%74%71%69%69%67%69%68%71%75%78%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Castro Marim

In Castro Marim 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 Castro Marim, you can check the information here.

Maximum UV Index Levels in Castro Marim for December

The chart shows the monthly maximum UV Index (UVI) for Castro Marim 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 Castro Marim typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109743
Data source: Castro Marim 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 Castro Marim Compares to Other Months

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

This table compares monthly weather conditions in Castro Marim, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)22 mm (0.9 inches)80%moderate
February Weather13°C (55°F)38 mm (1.5 inches)73%moderate
March Weather14°C (58°F)54 mm (2.1 inches)71%high
April Weather16°C (61°F)55 mm (2.2 inches)69%very high
May Weather20°C (68°F)19 mm (0.8 inches)69%very high
June Weather22°C (73°F)5 mm (0.2 inches)67%extreme
July Weather25°C (78°F)2 mm (0.1 inches)69%very high
August Weather26°C (79°F)1 mm (0.0 inches)68%very high
September Weather24°C (75°F)19 mm (0.8 inches)71%very high
October Weather20°C (68°F)25 mm (1.0 inches)75%high
November Weather15°C (59°F)54 mm (2.1 inches)78%moderate
December Weather13°C (55°F)37 mm (1.4 inches)81%moderate

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