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December Weather in Alcains, Portugal

Last updated: August 27, 2025

In Alcains, Portugal, the average temperature in December hovers around 9°C (48°F). Expect a chilly minimum of -3°C (28°F) and a delightful maximum of 19°C (66°F). During this month, precipitation measures approximately 99 mm (3.9 in) over 8 days, contributing to an average humidity of 85%—perfect for those cozy indoor moments!

December Temperature in Alcains

In December in Alcains, the average temperature is 9°C (48°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -3°C (28°F). This climate makes Alcains a versatile destination for travelers, offering both mild days and crisp evenings.

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

The chart illustrates December temperature patterns in Alcains, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alcains, December typically has an average temperature of 9°C (48°F), with highs reaching up to 19°C (66°F) and lows dropping to around -3°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec454952566369757570625248
Data source: Temperature data for Alcains 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 Alcains

In Alcains in December, the precipitation amount is 99 mm (3.9 in) spread over 8 days.

December Precipitation Trends in Alcains

The chart displays monthly precipitation patterns in Alcains, 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 Alcains, December typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec486910997441856377310499
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Alcains

In Alcains in December humidity is 85%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay warm and comfortable while traveling.

December Average Humidity in Alcains

This chart illustrates the average monthly humidity levels in Alcains, 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 Alcains is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%75%72%70%70%63%60%60%68%74%83%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Alcains

In Alcains 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 Alcains, you can check the information here.

Maximum UV Index Levels in Alcains for December

The chart shows the monthly maximum UV Index (UVI) for Alcains 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 Alcains typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810111098643
Data source: Alcains 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 Alcains Compares to Other Months

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

This table compares monthly weather conditions in Alcains, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)48 mm (1.9 inches)85%moderate
February Weather10°C (50°F)69 mm (2.7 inches)75%moderate
March Weather11°C (52°F)109 mm (4.3 inches)72%high
April Weather13°C (56°F)97 mm (3.8 inches)70%very high
May Weather17°C (64°F)44 mm (1.7 inches)70%very high
June Weather20°C (69°F)18 mm (0.7 inches)63%extreme
July Weather24°C (75°F)5 mm (0.2 inches)60%very high
August Weather24°C (75°F)6 mm (0.2 inches)60%very high
September Weather21°C (70°F)36 mm (1.4 inches)67%very high
October Weather17°C (62°F)73 mm (2.9 inches)74%high
November Weather11°C (52°F)104 mm (4.1 inches)83%moderate
December Weather9°C (48°F)99 mm (3.9 inches)85%moderate

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