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December Weather in Santo Isidoro, Portugal

Last updated: August 27, 2025

In Santo Isidoro, Portugal, the average temperature in December hovers around 14°C (58°F). Expect temperatures to range from a cool 9°C (48°F) to a pleasant 17°C (63°F). During this month, prepare for 82 mm (3.2 in) of precipitation over approximately 11 days, maintaining an average humidity of 85%.

December Temperature in Santo Isidoro

In December, in Santo Isidoro, the average temperature is 14°C (58°F). Maximum temperatures can reach 17°C (63°F), while minimums can drop as low as 9°C (48°F). It's a perfect time to visit for mild weather and enjoyable outdoor activities.

December Weather in Santo Isidoro: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Santo Isidoro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santo Isidoro, December typically has an average temperature of 14°C (58°F), with highs reaching up to 17°C (63°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec555656576062646464635957
Data source: Temperature data for Santo Isidoro 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 Santo Isidoro

In Santo Isidoro in December, the precipitation amount is 82 mm (3.2 in) over the course of 11 days.

December Precipitation Trends in Santo Isidoro

The chart displays monthly precipitation patterns in Santo Isidoro, 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 Santo Isidoro, December typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec4863697739166632639982
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Santo Isidoro

In Santo Isidoro in December, humidity is 85%. With an average temperature of 14°C (58°F), this humidity feels like a thick blanket wrapping around you, making even short walks feel heavy and exhausting for traveling.

December Average Humidity in Santo Isidoro

This chart illustrates the average monthly humidity levels in Santo Isidoro, 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 Santo Isidoro 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 Santo Isidoro

In Santo Isidoro 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 Santo Isidoro, you can check the information here.

Maximum UV Index Levels in Santo Isidoro for December

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

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

This table compares monthly weather conditions in Santo Isidoro, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (55°F)48 mm (1.9 inches)85%moderate
February Weather13°C (56°F)63 mm (2.5 inches)75%moderate
March Weather13°C (56°F)69 mm (2.7 inches)72%high
April Weather14°C (58°F)77 mm (3.0 inches)70%very high
May Weather16°C (61°F)39 mm (1.5 inches)70%very high
June Weather17°C (62°F)16 mm (0.6 inches)63%extreme
July Weather18°C (64°F)6 mm (0.2 inches)60%very high
August Weather18°C (64°F)6 mm (0.2 inches)60%very high
September Weather18°C (65°F)32 mm (1.3 inches)67%very high
October Weather17°C (63°F)63 mm (2.5 inches)74%high
November Weather15°C (60°F)99 mm (3.9 inches)83%moderate
December Weather14°C (58°F)82 mm (3.2 inches)85%moderate

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