December Weather in Porto, Brazil

Last updated: August 22, 2025

In Porto, Brazil, the average temperature in December hovers around 29°C (85°F), with a minimum of 23°C (73°F) and a maximum that can soar to 39°C (103°F). Expect precipitation totals of 69 mm (2.7 in) over approximately 10 days, while the average humidity remains high at 76%. Get ready for warm, tropical days!

December Temperature in Porto

In December in Porto, the average temperature is 29°C (85°F). Maximums can reach 39°C (103°F), and minimums can be as low as 23°C (73°F). This makes Porto an ideal destination for travelers seeking warm and sunny weather.

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

The chart illustrates December temperature patterns in Porto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Porto, December typically has an average temperature of 29°C (85°F), with highs reaching up to 39°C (103°F) and lows dropping to around 23°C (73°F).

Data source: Temperature data for Porto generated using information from the Copernicus Climate Change Service.

December Precipitation in Porto

In Porto in December, the precipitation amount is 69 mm (2.7 in) spread over a period of 10 days.

December Precipitation Trends in Porto

The chart displays monthly precipitation patterns in Porto, 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 Porto, December typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Porto

In Porto in December, humidity is 76%. With an average temperature of 29°C (85°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor exploration a sticky challenge but the lush surroundings and vibrant culture offer refreshing experiences in the shade.

December Average Humidity in Porto

This chart illustrates the average monthly humidity levels in Porto, 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 Porto is approximately 76%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Porto

In Porto in December, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Porto.

Maximum UV Index Levels in Porto for December

The chart shows the monthly maximum UV Index (UVI) for Porto 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 Porto typically reaches 13, which falls under the extreme exposure category.

Data source: Porto 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 Porto Compares to Other Months

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

This table compares monthly weather conditions in Porto, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	28°C (82°F)	194 mm (7.6 inches)	90%	extreme
February Weather	27°C (81°F)	315 mm (12.4 inches)	91%	extreme
March Weather	27°C (80°F)	409 mm (16.1 inches)	92%	extreme
April Weather	27°C (81°F)	312 mm (12.3 inches)	93%	extreme
May Weather	27°C (81°F)	149 mm (5.9 inches)	88%	extreme
June Weather	28°C (82°F)	22 mm (0.9 inches)	75%	extreme
July Weather	28°C (82°F)	18 mm (0.7 inches)	52%	extreme
August Weather	29°C (84°F)	3 mm (0.1 inches)	42%	extreme
September Weather	30°C (86°F)	2 mm (0.1 inches)	36%	extreme
October Weather	30°C (87°F)	7 mm (0.3 inches)	35%	extreme
November Weather	30°C (86°F)	61 mm (2.4 inches)	43%	extreme
December Weather	29°C (85°F)	69 mm (2.7 inches)	76%	extreme