nomadseason

December Weather in Custoias, Portugal

Last updated: August 27, 2025

In December, the average temperature in Custoias, Portugal hovers around 8°C (46°F). Expect a chilly range, with minimums dipping to -4°C (24°F) and maximums reaching 16°C (61°F). Precipitation measures about 70 mm (2.8 in) over 9 days, while the air remains quite moist, with an average humidity of 91%.

December Temperature in Custoias

In December in Custoias, the average temperature is 8°C (46°F). Maximum temperatures can reach 16°C (61°F), while minimums can drop to as low as -4°C (24°F). Be prepared for a mix of cool and mild weather, making it a great time to explore outdoor activities in Custoias.

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

The chart illustrates December temperature patterns in Custoias, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Custoias, December typically has an average temperature of 8°C (46°F), with highs reaching up to 16°C (61°F) and lows dropping to around -4°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec424750546267727266594946
Data source: Temperature data for Custoias generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Custoias

In Custoias in December, the total precipitation amount is 70 mm (2.8 in) spread over 9 days.

December Precipitation Trends in Custoias

The chart displays monthly precipitation patterns in Custoias, 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 Custoias, December typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec285964702933141031506570
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Custoias

In Custoias in December, humidity is 91%. With an average temperature of 8°C (46°F), this humidity feels like a thick blanket enveloping you, making outdoor activities uncomfortable and leaving a chill that seeps into your bones, creating an atmosphere that is damp and heavy, perfect for cozy indoor explorations but challenging for leisurely travel.

December Average Humidity in Custoias

This chart illustrates the average monthly humidity levels in Custoias, 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 Custoias is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%85%79%77%76%64%54%52%63%78%90%91%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Custoias

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

Maximum UV Index Levels in Custoias for December

The chart shows the monthly maximum UV Index (UVI) for Custoias 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 Custoias typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34699111098642
Data source: Custoias 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 Custoias Compares to Other Months

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

This table compares monthly weather conditions in Custoias, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)28 mm (1.1 inches)91%moderate
February Weather9°C (48°F)59 mm (2.3 inches)85%moderate
March Weather10°C (50°F)64 mm (2.5 inches)79%high
April Weather12°C (55°F)70 mm (2.7 inches)77%very high
May Weather17°C (62°F)29 mm (1.2 inches)76%very high
June Weather19°C (67°F)33 mm (1.3 inches)64%extreme
July Weather22°C (72°F)14 mm (0.6 inches)54%very high
August Weather22°C (72°F)10 mm (0.4 inches)52%very high
September Weather19°C (67°F)31 mm (1.2 inches)63%very high
October Weather15°C (59°F)50 mm (2.0 inches)78%high
November Weather10°C (50°F)65 mm (2.6 inches)90%moderate
December Weather8°C (46°F)70 mm (2.8 inches)91%low

Compare Custoias's Climate with Cities Worldwide