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December Weather in Seixal, Portugal

Last updated: August 27, 2025

The average temperature in Seixal, Portugal during December is a mild 12°C (54°F). Expect temperatures to range from a chilly minimum of 2°C (36°F) to a pleasant maximum of 20°C (68°F). Rain lovers will note a precipitation amount of 55 mm (2.2 in) spread over about 7 days, while the air hums with an average humidity of 85%.

December Temperature in Seixal

In December in Seixal, the average temperature is 12°C (54°F). The maximum can reach 20°C (68°F), and the minimum can be as low as 2°C (36°F). This moderate climate makes Seixal a pleasant destination for travelers seeking comfortable weather for outdoor activities.

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

The chart illustrates December temperature patterns in Seixal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seixal, December typically has an average temperature of 12°C (54°F), with highs reaching up to 20°C (68°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec515456596568717270655854
Data source: Temperature data for Seixal 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 Seixal

In Seixal in December, the precipitation amount is 55 mm (2.2 in) over the course of 7 days.

December Precipitation Trends in Seixal

The chart displays monthly precipitation patterns in Seixal, 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 Seixal, December typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec3450687238105324427455
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Seixal

In Seixal in December, humidity is 85%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making traveling not only uncomfortable but also exhausting as the damp air clings to your skin and slows your movements.

December Average Humidity in Seixal

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

In Seixal 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 Seixal, you can check the information here.

Maximum UV Index Levels in Seixal for December

The chart shows the monthly maximum UV Index (UVI) for Seixal 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 Seixal typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Seixal 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 Seixal Compares to Other Months

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

This table compares monthly weather conditions in Seixal, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)33 mm (1.3 inches)85%moderate
February Weather12°C (55°F)50 mm (2.0 inches)75%moderate
March Weather14°C (57°F)68 mm (2.7 inches)72%high
April Weather15°C (59°F)72 mm (2.8 inches)70%very high
May Weather18°C (65°F)38 mm (1.5 inches)70%very high
June Weather20°C (68°F)10 mm (0.4 inches)63%extreme
July Weather22°C (71°F)5 mm (0.2 inches)60%very high
August Weather22°C (72°F)3 mm (0.1 inches)60%very high
September Weather21°C (71°F)24 mm (0.9 inches)67%very high
October Weather19°C (66°F)42 mm (1.7 inches)74%high
November Weather14°C (58°F)74 mm (2.9 inches)83%moderate
December Weather12°C (54°F)55 mm (2.2 inches)85%moderate

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