December Weather in Olhao, Portugal

Last updated: August 27, 2025

In December, the average temperature in Olhao, Portugal is a comfortable 15°C (59°F). Expect lows of 9°C (48°F) and highs reaching 20°C (68°F). The region experiences a moderate precipitation amount of 44 mm (1.7 in) over approximately 5 days, accompanied by an average humidity level of 81%. Enjoy the mild climate while being prepared for occasional rain!

December Temperature in Olhao

In December in Olhao, the average temperature is 15°C (59°F). Maximums can reach 20°C (68°F) and minimums can be as low as 9°C (48°F). This mild climate makes Olhao an ideal destination for travelers looking to enjoy comfortable weather while exploring the area.

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

The chart illustrates December temperature patterns in Olhao, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Olhao, December typically has an average temperature of 15°C (59°F), with highs reaching up to 20°C (68°F) and lows dropping to around 9°C (48°F).

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

December Precipitation in Olhao

In Olhao in December, the precipitation amount is 44 mm (1.7 in) over the course of 5 days.

December Precipitation Trends in Olhao

The chart displays monthly precipitation patterns in Olhao, 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 Olhao, December typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 5 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 Olhao

In Olhao in December humidity is 81%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket draped over you, making traveling quite uncomfortable as you constantly wipe away beads of sweat and feel the stickiness clinging to your clothes.

December Average Humidity in Olhao

This chart illustrates the average monthly humidity levels in Olhao, 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 Olhao is approximately 81%, 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 Olhao

In Olhao 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 Olhao, you can check the information here.

Maximum UV Index Levels in Olhao for December

The chart shows the monthly maximum UV Index (UVI) for Olhao 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 Olhao typically reaches 3, which falls under the moderate exposure category.

Data source: Olhao 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 Olhao Compares to Other Months

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

This table compares monthly weather conditions in Olhao, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	26 mm (1.0 inches)	80%	moderate
February Weather	14°C (58°F)	45 mm (1.8 inches)	73%	moderate
March Weather	15°C (59°F)	68 mm (2.7 inches)	71%	high
April Weather	16°C (60°F)	49 mm (1.9 inches)	69%	very high
May Weather	18°C (65°F)	14 mm (0.6 inches)	69%	very high
June Weather	20°C (68°F)	3 mm (0.1 inches)	67%	extreme
July Weather	22°C (72°F)	2 mm (0.1 inches)	69%	very high
August Weather	23°C (74°F)	0 mm (0.0 inches)	68%	very high
September Weather	22°C (72°F)	11 mm (0.4 inches)	71%	very high
October Weather	20°C (68°F)	28 mm (1.1 inches)	75%	high
November Weather	16°C (62°F)	59 mm (2.3 inches)	78%	moderate
December Weather	15°C (59°F)	44 mm (1.7 inches)	81%	moderate