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December Weather in Serta, Portugal

Last updated: August 27, 2025

In December, the average temperature in Serta, Portugal hovers around 10°C (50°F), with a minimum of -1°C (30°F) and a maximum of 19°C (66°F). Expect 102 mm (4.0 in) of precipitation spread over 9 days, and a high average humidity of 85%. Plan accordingly for a mix of cooler weather and moisture!

December Temperature in Serta

In December in Serta, the average temperature is 10°C (50°F), with maximums reaching 19°C (66°F) and minimums dipping as low as -1°C (30°F). It’s a great time to explore Serta if you’re prepared for a mix of mild days and cool evenings.

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

The chart illustrates December temperature patterns in Serta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Serta, December typically has an average temperature of 10°C (50°F), with highs reaching up to 19°C (66°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec475153576467737370635350
Data source: Temperature data for Serta 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 Serta

In Serta in December, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

December Precipitation Trends in Serta

The chart displays monthly precipitation patterns in Serta, 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 Serta, December typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec52781211085021693575117102
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Serta

In Serta in December, humidity is 85%. With an average temperature of 10°C (50°F), this humidity feels like a heavy, damp blanket surrounding you, making travel feel sluggish and uncomfortable as you navigate through the thick, moist air.

December Average Humidity in Serta

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

In Serta 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 Serta, you can check the information here.

Maximum UV Index Levels in Serta for December

The chart shows the monthly maximum UV Index (UVI) for Serta 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 Serta typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689111098643
Data source: Serta 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 Serta Compares to Other Months

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

This table compares monthly weather conditions in Serta, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)52 mm (2.0 inches)85%moderate
February Weather10°C (51°F)78 mm (3.1 inches)75%moderate
March Weather12°C (53°F)121 mm (4.8 inches)72%high
April Weather14°C (57°F)108 mm (4.3 inches)70%very high
May Weather18°C (64°F)50 mm (1.9 inches)70%very high
June Weather20°C (68°F)21 mm (0.8 inches)63%extreme
July Weather23°C (73°F)6 mm (0.2 inches)60%very high
August Weather23°C (74°F)8 mm (0.3 inches)60%very high
September Weather21°C (71°F)35 mm (1.4 inches)67%very high
October Weather17°C (63°F)75 mm (2.9 inches)74%high
November Weather12°C (54°F)117 mm (4.6 inches)83%moderate
December Weather10°C (50°F)102 mm (4.0 inches)85%moderate

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