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December Weather in Sienes, Spain

Last updated: August 27, 2025

In December, the average temperature in Sienes, Spain hovers around 5°C (41°F), with a minimum of -5°C (23°F) and a maximum of 16°C (61°F). Prepare for some moisture, as 37 mm (1.5 in) of precipitation is expected over 7 days, coupled with a high average humidity of 90%. Don’t forget your umbrella! ☔️

December Temperature in Sienes

In December in Sienes, the average temperature is 5°C (41°F). Maximums can reach 16°C (61°F), while minimums can drop as low as -5°C (23°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for their trip to Sienes.

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

The chart illustrates December temperature patterns in Sienes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sienes, December typically has an average temperature of 5°C (41°F), with highs reaching up to 16°C (61°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec374345505967737364554441
Data source: Temperature data for Sienes 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 Sienes

In Sienes in December, the precipitation amount is 37 mm (1.5 in) during a span of 7 days.

December Precipitation Trends in Sienes

The chart displays monthly precipitation patterns in Sienes, 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 Sienes, December typically receives around 37 mm (1.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec353553926254222338425738
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sienes

In Sienes in December, humidity is 90%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that clings to your skin, making travel feel more strenuous as you navigate the cold air mixed with moisture, potentially leaving you feeling sluggish and uncomfortable.

December Average Humidity in Sienes

This chart illustrates the average monthly humidity levels in Sienes, 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 Sienes is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%86%79%74%71%63%59%58%66%77%87%90%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sienes

In Sienes in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Sienes, you can visit Hourly UV Index in Sienes.

Maximum UV Index Levels in Sienes for December

The chart shows the monthly maximum UV Index (UVI) for Sienes 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 Sienes typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3469101111108642
Data source: Sienes 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 Sienes Compares to Other Months

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

This table compares monthly weather conditions in Sienes, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)35 mm (1.4 inches)90%moderate
February Weather6°C (43°F)35 mm (1.4 inches)86%moderate
March Weather7°C (46°F)53 mm (2.1 inches)79%high
April Weather10°C (50°F)92 mm (3.6 inches)74%very high
May Weather15°C (59°F)62 mm (2.4 inches)71%very high
June Weather19°C (67°F)54 mm (2.1 inches)63%extreme
July Weather23°C (74°F)22 mm (0.9 inches)59%extreme
August Weather23°C (73°F)23 mm (0.9 inches)58%very high
September Weather18°C (64°F)38 mm (1.5 inches)65%very high
October Weather13°C (55°F)42 mm (1.6 inches)77%high
November Weather7°C (44°F)56 mm (2.2 inches)87%moderate
December Weather5°C (41°F)37 mm (1.5 inches)90%low

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