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December Weather in Oleiros, Portugal

Last updated: August 27, 2025

In December, the average temperature in Oleiros, Portugal hovers around 9°C (48°F). Expect a chill in the air, with minimums dipping to -1°C (30°F) and highs reaching up to 18°C (66°F). Be prepared for a splash of rain, as 128 mm (5.0 in) of precipitation typically falls over 12 days. With an average humidity of 85%, you'll want to bundle up to stay cozy!

December Temperature in Oleiros

In December in Oleiros, the average temperature is 9°C (48°F). Maximums can reach 18°C (66°F), and minimums can be as low as -1°C (30°F). This mild but variable weather makes it a great time for travelers to explore the region while dressing in layers.

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

The chart illustrates December temperature patterns in Oleiros, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oleiros, December typically has an average temperature of 9°C (48°F), with highs reaching up to 18°C (66°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec454951546164697067605148
Data source: Temperature data for Oleiros 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 Oleiros

In Oleiros in December, the precipitation amount is 128 mm (5.0 in) over the course of 12 days.

December Precipitation Trends in Oleiros

The chart displays monthly precipitation patterns in Oleiros, 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 Oleiros, December typically receives around 128 mm (5.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec6399141140683212154097139128
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Oleiros

In Oleiros in December humidity is 85%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay warm and comfortable while traveling.

December Average Humidity in Oleiros

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

In Oleiros 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 Oleiros, you can check the information here.

Maximum UV Index Levels in Oleiros for December

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

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

This table compares monthly weather conditions in Oleiros, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)63 mm (2.5 inches)85%moderate
February Weather9°C (49°F)99 mm (3.9 inches)75%moderate
March Weather10°C (51°F)141 mm (5.5 inches)72%high
April Weather12°C (55°F)140 mm (5.5 inches)70%very high
May Weather16°C (61°F)68 mm (2.7 inches)70%very high
June Weather18°C (65°F)32 mm (1.2 inches)63%extreme
July Weather21°C (70°F)12 mm (0.5 inches)60%very high
August Weather21°C (70°F)15 mm (0.6 inches)60%very high
September Weather19°C (67°F)40 mm (1.6 inches)67%very high
October Weather16°C (60°F)97 mm (3.8 inches)74%high
November Weather11°C (51°F)139 mm (5.5 inches)83%moderate
December Weather9°C (48°F)128 mm (5.0 inches)85%moderate

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