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December Weather in Seia, Portugal

Last updated: August 27, 2025

In Seia, Portugal, the average temperature in December hovers around 8°C (47°F), with the mercury dipping as low as -2°C (28°F) and occasionally peaking at 17°C (62°F). This month brings about 136 mm (5.4 in) of precipitation across 13 rainy days, while the air remains quite humid, averaging 87%. Prepare for a variety of weather as you explore this vibrant destination!

December Temperature in Seia

In December in Seia, the average temperature is 8°C (47°F). Maximum temperatures can reach 17°C (62°F), while minimums can drop as low as -2°C (28°F). It's advisable to pack layers and be prepared for chilly evenings when visiting during this time.

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

The chart illustrates December temperature patterns in Seia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seia, December typically has an average temperature of 8°C (47°F), with highs reaching up to 17°C (62°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec434850546064707066595046
Data source: Temperature data for Seia 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 Seia

In Seia in December, the precipitation amount reaches 136 mm (5.4 in) over a span of 13 days.

December Precipitation Trends in Seia

The chart displays monthly precipitation patterns in Seia, 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 Seia, December typically receives around 136 mm (5.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec68110133125563912174394132136
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Seia

In Seia in December, humidity is 87%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration uncomfortably muggy despite the cool air.

December Average Humidity in Seia

This chart illustrates the average monthly humidity levels in Seia, 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 Seia is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%81%78%79%78%71%63%64%71%79%86%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Seia

In Seia 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 Seia, you can check the information here.

Maximum UV Index Levels in Seia for December

The chart shows the monthly maximum UV Index (UVI) for Seia 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 Seia typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346910111098643
Data source: Seia 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 Seia Compares to Other Months

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

This table compares monthly weather conditions in Seia, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)68 mm (2.7 inches)87%moderate
February Weather9°C (48°F)110 mm (4.3 inches)81%moderate
March Weather10°C (50°F)133 mm (5.2 inches)78%high
April Weather12°C (54°F)125 mm (4.9 inches)79%very high
May Weather16°C (61°F)56 mm (2.2 inches)78%very high
June Weather18°C (65°F)39 mm (1.5 inches)71%extreme
July Weather21°C (70°F)12 mm (0.5 inches)63%very high
August Weather21°C (71°F)17 mm (0.7 inches)64%very high
September Weather19°C (67°F)43 mm (1.7 inches)71%very high
October Weather15°C (59°F)94 mm (3.7 inches)79%high
November Weather10°C (50°F)132 mm (5.2 inches)86%moderate
December Weather8°C (47°F)136 mm (5.4 inches)87%moderate

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