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December Weather in Rio Mau, Portugal

Last updated: August 27, 2025

The average temperature in Rio Mau, Portugal during December hovers around 12°C (53°F). Expect a minimum of 3°C (38°F) and a maximum of 18°C (66°F). Be prepared for 190 mm (7.5 in) of precipitation spread over 16 days, with an average humidity of a cozy 87%.

December Temperature in Rio Mau

In December in Rio Mau, the average temperature is 12°C (53°F). Maximums can reach 18°C (66°F) and minimums can be as low as 3°C (38°F). This mild climate makes Rio Mau an enjoyable destination for travelers seeking a comfortable getaway.

December Weather in Rio Mau: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rio Mau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Mau, December typically has an average temperature of 12°C (53°F), with highs reaching up to 18°C (66°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec505354576264686866615553
Data source: Temperature data for Rio Mau 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 Rio Mau

In Rio Mau in December, the precipitation amount is 190 mm (7.5 in) over a span of 16 days.

December Precipitation Trends in Rio Mau

The chart displays monthly precipitation patterns in Rio Mau, 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 Rio Mau, December typically receives around 190 mm (7.5 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec1031421501478544192239131175190
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rio Mau

In Rio Mau in December, humidity is 87%. With an average temperature of 12°C (53°F), this humidity feels like a damp blanket enveloping you, making travel uncomfortable and stifling, as the air thickens and clings to your skin, sapping your energy as you navigate the sights.

December Average Humidity in Rio Mau

This chart illustrates the average monthly humidity levels in Rio Mau, 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 Rio Mau 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 Rio Mau

In Rio Mau 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 Rio Mau, you can visit Hourly UV Index in Rio Mau.

Maximum UV Index Levels in Rio Mau for December

The chart shows the monthly maximum UV Index (UVI) for Rio Mau 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 Rio Mau typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2468910997632
Data source: Rio Mau 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 Rio Mau Compares to Other Months

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

This table compares monthly weather conditions in Rio Mau, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)103 mm (4.0 inches)87%low
February Weather11°C (53°F)142 mm (5.6 inches)81%moderate
March Weather12°C (54°F)150 mm (5.9 inches)78%high
April Weather14°C (57°F)147 mm (5.8 inches)79%very high
May Weather16°C (62°F)85 mm (3.4 inches)78%very high
June Weather18°C (64°F)44 mm (1.7 inches)71%very high
July Weather20°C (68°F)19 mm (0.7 inches)63%very high
August Weather20°C (68°F)21 mm (0.8 inches)64%very high
September Weather19°C (67°F)39 mm (1.5 inches)71%high
October Weather16°C (62°F)131 mm (5.2 inches)79%high
November Weather13°C (56°F)175 mm (6.9 inches)86%moderate
December Weather12°C (53°F)190 mm (7.5 inches)87%low

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