January Weather in Rio Maior, Portugal

Last updated: August 27, 2025

In January, the average temperature in Rio Maior, Portugal hovers around 10°C (51°F). Expect chilly nights with a minimum of -1°C (30°F), while daytime highs can reach up to 20°C (69°F). Precipitation is moderate, with around 41 mm (1.6 in) spread over 5 days, and average humidity sits at a comfortable 85%. Get ready for a mix of cool weather and occasional rain!

January Temperature in Rio Maior

In January in Rio Maior, the average temperature is 10°C (51°F). Maximums can reach 20°C (69°F), while minimums can drop to as low as -1°C (30°F). Travelers should be prepared for a mix of mild and chilly weather, making layers essential for comfort during excursions.

January Weather in Rio Maior: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Rio Maior, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Maior, January typically has an average temperature of 10°C (51°F), with highs reaching up to 20°C (69°F) and lows dropping to around -1°C (30°F).

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

January Precipitation in Rio Maior

In Rio Maior in January, the precipitation amount is 41 mm (1.6 in) over a period of 5 days.

January Precipitation Trends in Rio Maior

The chart displays monthly precipitation patterns in Rio Maior, 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 Rio Maior, January typically receives around 41 mm (1.6 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 Rio Maior

In Rio Maior in January, humidity is 85%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill enveloping you, making travel quite uncomfortable as your clothes cling to your skin and the air feels heavy, often leaving you longing for a dry, warmer environment.

January Average Humidity in Rio Maior

This chart illustrates the average monthly humidity levels in Rio Maior, 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 Rio Maior 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 Rio Maior

In Rio Maior 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 Rio Maior, you can check the information here.

Maximum UV Index Levels in Rio Maior for January

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

Data source: Rio Maior 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 Rio Maior Compares to Other Months

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

This table compares monthly weather conditions in Rio Maior, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	41 mm (1.6 inches)	85%	moderate
February Weather	12°C (54°F)	53 mm (2.1 inches)	75%	moderate
March Weather	13°C (56°F)	74 mm (2.9 inches)	72%	high
April Weather	15°C (59°F)	82 mm (3.2 inches)	70%	very high
May Weather	18°C (64°F)	39 mm (1.5 inches)	70%	very high
June Weather	19°C (67°F)	16 mm (0.6 inches)	63%	extreme
July Weather	21°C (70°F)	6 mm (0.2 inches)	60%	very high
August Weather	21°C (70°F)	6 mm (0.2 inches)	60%	very high
September Weather	21°C (69°F)	27 mm (1.1 inches)	67%	very high
October Weather	18°C (65°F)	58 mm (2.3 inches)	74%	high
November Weather	14°C (57°F)	88 mm (3.5 inches)	83%	moderate
December Weather	12°C (54°F)	64 mm (2.5 inches)	85%	moderate