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December Weather in Fortios, Portugal

Last updated: August 27, 2025

In December, the average temperature in Fortios, Portugal is a crisp 10°C (50°F), with lows dipping to -1°C (31°F) and highs reaching up to 19°C (66°F). You'll want to be prepared for some wet days, as precipitation averages 75 mm (3.0 in) over 9 days, accompanied by a notably high humidity level of 85%.

December Temperature in Fortios

In December in Fortios, the average temperature is 10°C (50°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -1°C (31°F). Be sure to pack accordingly, as this month offers a mix of mild and chilly days perfect for layering your travel outfits.

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

The chart illustrates December temperature patterns in Fortios, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fortios, December typically has an average temperature of 10°C (50°F), with highs reaching up to 19°C (66°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec475254576570757772645450
Data source: Temperature data for Fortios 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 Fortios

In Fortios in December, the precipitation amount is 75 mm (3.0 in) distributed over 9 days.

December Precipitation Trends in Fortios

The chart displays monthly precipitation patterns in Fortios, 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 Fortios, December typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec3752938741144731538075
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fortios

In Fortios in December, humidity is 85%. With an average temperature of 10°C (50°F), this humidity feels like a heavy, damp blanket surrounding you, making travel feel sluggish and uncomfortable as you navigate through the thick, moist air.

December Average Humidity in Fortios

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

In Fortios 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 Fortios, you can check the information here.

Maximum UV Index Levels in Fortios for December

The chart shows the monthly maximum UV Index (UVI) for Fortios 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 Fortios typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3469101110108643
Data source: Fortios 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 Fortios Compares to Other Months

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

This table compares monthly weather conditions in Fortios, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)37 mm (1.4 inches)85%moderate
February Weather11°C (52°F)51 mm (2.0 inches)75%moderate
March Weather12°C (54°F)93 mm (3.6 inches)72%high
April Weather14°C (58°F)87 mm (3.4 inches)70%very high
May Weather19°C (66°F)41 mm (1.6 inches)70%very high
June Weather21°C (70°F)14 mm (0.6 inches)63%extreme
July Weather24°C (76°F)4 mm (0.2 inches)60%very high
August Weather25°C (77°F)7 mm (0.3 inches)60%very high
September Weather22°C (73°F)31 mm (1.2 inches)67%very high
October Weather18°C (65°F)53 mm (2.1 inches)74%high
November Weather12°C (54°F)80 mm (3.2 inches)83%moderate
December Weather10°C (50°F)75 mm (3.0 inches)85%moderate

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