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December Weather in Sao Luis, Portugal

Last updated: August 27, 2025

In Sao Luis, Portugal, the average temperature in December is a mild 13°C (55°F), with fluctuations ranging from a cool 3°C (38°F) to a warm 20°C (69°F). Expect 51 mm (2.0 in) of precipitation spread across 9 days, contributing to an average humidity level of 81%. Perfect for embracing the season’s nuances!

December Temperature in Sao Luis

In December in Sao Luis, the average temperature is 13°C (55°F). Maximums can reach 20°C (69°F), and minimums can be as low as 3°C (38°F). This range makes Sao Luis an ideal destination for travelers seeking mild weather and comfortable outdoor activities.

December Weather in Sao Luis: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sao Luis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sao Luis, December typically has an average temperature of 13°C (55°F), with highs reaching up to 20°C (69°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec525557596567707170665955
Data source: Temperature data for Sao Luis 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 Sao Luis

In Sao Luis in December, the total precipitation amount is 51 mm (2.0 in) spread over 9 days.

December Precipitation Trends in Sao Luis

The chart displays monthly precipitation patterns in Sao Luis, 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 Sao Luis, December typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec2954836623103211455851
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sao Luis

In Sao Luis in December, humidity is 81%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket wrapping around you, making strolls outdoors feel heavy and slightly oppressive, which may be less than ideal for travelers looking to explore comfortably.

December Average Humidity in Sao Luis

This chart illustrates the average monthly humidity levels in Sao Luis, 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 Sao Luis is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%74%71%69%69%67%69%68%71%75%78%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sao Luis

In Sao Luis 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 Sao Luis, you can check the information here.

Maximum UV Index Levels in Sao Luis for December

The chart shows the monthly maximum UV Index (UVI) for Sao Luis 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 Sao Luis typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101110109743
Data source: Sao Luis 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 Sao Luis Compares to Other Months

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

This table compares monthly weather conditions in Sao Luis, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)29 mm (1.1 inches)80%moderate
February Weather13°C (55°F)54 mm (2.1 inches)73%moderate
March Weather14°C (57°F)83 mm (3.3 inches)71%high
April Weather15°C (60°F)66 mm (2.6 inches)69%very high
May Weather18°C (65°F)23 mm (0.9 inches)69%very high
June Weather19°C (67°F)10 mm (0.4 inches)67%extreme
July Weather21°C (70°F)3 mm (0.1 inches)69%very high
August Weather22°C (71°F)2 mm (0.1 inches)68%very high
September Weather21°C (70°F)11 mm (0.4 inches)71%very high
October Weather19°C (66°F)45 mm (1.8 inches)75%high
November Weather15°C (59°F)58 mm (2.3 inches)78%moderate
December Weather13°C (55°F)51 mm (2.0 inches)81%moderate

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