January Weather in Oeiras, Portugal

Last updated: August 27, 2025

In January, the average temperature in Oeiras, Portugal sits comfortably at 12°C (53°F). Expect a cool minimum of 3°C (38°F) and a pleasant maximum of 19°C (66°F). During this time, you'll encounter an average precipitation of 37 mm (1.5 in) across about 5 days, alongside an average humidity level of 85%.

January Temperature in Oeiras

In January in Oeiras, the average temperature is 12°C (53°F). The maximum can reach 19°C (66°F), while the minimum can drop as low as 3°C (38°F). Be prepared for a mild climate with varying temperatures during your travels.

January Weather in Oeiras: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Oeiras, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oeiras, January typically has an average temperature of 12°C (53°F), with highs reaching up to 19°C (66°F) and lows dropping to around 3°C (38°F).

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

January Precipitation in Oeiras

In Oeiras in January, the precipitation amount is 37 mm (1.5 in) spread over a period of 5 days.

January Precipitation Trends in Oeiras

The chart displays monthly precipitation patterns in Oeiras, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Oeiras, January typically receives around 37 mm (1.5 inches) of precipitation spread over approximately 5 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Oeiras

In Oeiras in January, humidity is 85%. With an average temperature of 12°C (53°F), this humidity feels like a damp embrace, making travel somewhat uncomfortable as you navigate the thick, moist air that clings to your skin.

January Average Humidity in Oeiras

This chart illustrates the average monthly humidity levels in Oeiras, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Oeiras is approximately 85%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Oeiras

In Oeiras in January, 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 Oeiras, you can check the information here.

Maximum UV Index Levels in Oeiras for January

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

Data source: Oeiras January 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 January Weather in Oeiras Compares to Other Months

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

This table compares monthly weather conditions in Oeiras, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (53°F)	37 mm (1.5 inches)	85%	moderate
February Weather	13°C (55°F)	53 mm (2.1 inches)	75%	moderate
March Weather	14°C (57°F)	66 mm (2.6 inches)	72%	high
April Weather	15°C (59°F)	73 mm (2.9 inches)	70%	very high
May Weather	17°C (63°F)	36 mm (1.4 inches)	70%	very high
June Weather	18°C (66°F)	11 mm (0.4 inches)	63%	extreme
July Weather	20°C (68°F)	5 mm (0.2 inches)	60%	very high
August Weather	20°C (69°F)	3 mm (0.1 inches)	60%	very high
September Weather	20°C (68°F)	27 mm (1.1 inches)	67%	very high
October Weather	18°C (65°F)	46 mm (1.8 inches)	74%	high
November Weather	15°C (59°F)	80 mm (3.2 inches)	83%	moderate
December Weather	13°C (56°F)	62 mm (2.4 inches)	85%	moderate