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December Weather in Sils, Spain

Last updated: August 27, 2025

In December, the average temperature in Sils, Spain hovers around 9°C (48°F), with a minimum of -2°C (29°F) and a maximum of 19°C (67°F). Expect some rain, as precipitation averages 37 mm (1.5 in) over approximately 5 days. You'll also experience a moderately high humidity level of 74%, making it a time for layering and staying cozy!

December Temperature in Sils

In December in Sils, the average temperature is 9°C (48°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -2°C (29°F). This mild climate makes it a great time to explore Sils while enjoying comfortable outdoor activities.

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

The chart illustrates December temperature patterns in Sils, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sils, December typically has an average temperature of 9°C (48°F), with highs reaching up to 19°C (67°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec454952566371767669625348
Data source: Temperature data for Sils 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 Sils

In Sils in December, the precipitation amount is 37 mm (1.5 in) spread over a period of 5 days.

December Precipitation Trends in Sils

The chart displays monthly precipitation patterns in Sils, 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 Sils, December typically receives around 37 mm (1.5 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec7452587972485654961297937
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sils

In Sils in December humidity is 74%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and necessitating warm layers to fully enjoy your explorations.

December Average Humidity in Sils

This chart illustrates the average monthly humidity levels in Sils, 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 Sils is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%73%75%77%78%77%78%75%73%77%77%74%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sils

In Sils 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 Sils, you can visit Hourly UV Index in Sils.

Maximum UV Index Levels in Sils for December

The chart shows the monthly maximum UV Index (UVI) for Sils 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 Sils typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34578101097632
Data source: Sils 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 Sils Compares to Other Months

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

This table compares monthly weather conditions in Sils, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)74 mm (2.9 inches)77%moderate
February Weather10°C (50°F)52 mm (2.1 inches)73%moderate
March Weather11°C (52°F)58 mm (2.3 inches)75%moderate
April Weather13°C (56°F)79 mm (3.1 inches)77%high
May Weather17°C (63°F)72 mm (2.8 inches)78%very high
June Weather22°C (72°F)48 mm (1.9 inches)77%very high
July Weather24°C (76°F)56 mm (2.2 inches)78%very high
August Weather24°C (76°F)54 mm (2.1 inches)75%very high
September Weather21°C (69°F)96 mm (3.8 inches)73%high
October Weather17°C (62°F)129 mm (5.1 inches)77%high
November Weather11°C (53°F)79 mm (3.1 inches)77%moderate
December Weather9°C (48°F)37 mm (1.5 inches)74%low

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