January Weather in Custoias, Portugal

Last updated: August 27, 2025

In January, the average temperature in Custoias, Portugal hovers around 6°C (42°F), with fluctuations ranging from a brisk -5°C (24°F) to a pleasant 18°C (65°F). Expect a total precipitation of 28 mm (1.1 in) throughout approximately 5 days, coupled with an average humidity of a high 91%. Prepare for a mix of chilly days and occasional warmth!

January Temperature in Custoias

In January in Custoias, the average temperature is 6°C (42°F). Maximum temperatures can reach 18°C (65°F), while minima can drop as low as -5°C (24°F). Be prepared for a mix of chilly and mild weather, making it ideal for layered clothing during your travels.

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

The chart illustrates January temperature patterns in Custoias, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Custoias, January typically has an average temperature of 6°C (42°F), with highs reaching up to 18°C (65°F) and lows dropping to around -5°C (24°F).

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

January Precipitation in Custoias

In Custoias in January, the precipitation amount is 28 mm (1.1 in) over a period of 5 days.

January Precipitation Trends in Custoias

The chart displays monthly precipitation patterns in Custoias, 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 Custoias, January typically receives around 28 mm (1.1 inches) of precipitation spread over approximately 5 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Custoias

In Custoias in January humidity is 91%. With an average temperature of 6°C (42°F), this humidity feels like a chill that penetrates deep into your bones, making outdoor exploration uncomfortable and encouraging travelers to seek warm indoor alternatives.

January Average Humidity in Custoias

This chart illustrates the average monthly humidity levels in Custoias, 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 Custoias is approximately 91%, 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 Custoias

In Custoias 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 Custoias, you can check the information here.

Maximum UV Index Levels in Custoias for January

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

Data source: Custoias 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 Custoias Compares to Other Months

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

This table compares monthly weather conditions in Custoias, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (42°F)	28 mm (1.1 inches)	91%	moderate
February Weather	9°C (48°F)	59 mm (2.3 inches)	85%	moderate
March Weather	10°C (50°F)	64 mm (2.5 inches)	79%	high
April Weather	12°C (55°F)	70 mm (2.7 inches)	77%	very high
May Weather	17°C (62°F)	29 mm (1.2 inches)	76%	very high
June Weather	19°C (67°F)	33 mm (1.3 inches)	64%	extreme
July Weather	22°C (72°F)	14 mm (0.6 inches)	54%	very high
August Weather	22°C (72°F)	10 mm (0.4 inches)	52%	very high
September Weather	19°C (67°F)	31 mm (1.2 inches)	63%	very high
October Weather	15°C (59°F)	50 mm (2.0 inches)	78%	high
November Weather	10°C (50°F)	65 mm (2.6 inches)	90%	moderate
December Weather	8°C (46°F)	70 mm (2.8 inches)	91%	low