January Weather in Castellar del Riu, Spain

Last updated: August 27, 2025

In January, the average temperature in Castellar del Riu, Spain hovers around 4°C (40°F). Expect chilly nights with minimums dropping to -6°C (22°F), while occasional warm spells can reach a comfortable 18°C (65°F). Throughout the month, you can anticipate 46 mm (1.8 in) of precipitation spread across 5 days, paired with an average humidity level of 79%. Stay prepared for a mix of weather!

January Temperature in Castellar del Riu

In January in Castellar del Riu, the average temperature is 4°C (40°F), with maximums reaching 18°C (65°F) and minimums dropping down to -6°C (22°F). Travelers should be prepared for chilly days and cool nights, making warm clothing essential for an enjoyable visit.

January Weather in Castellar del Riu: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Castellar del Riu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castellar del Riu, January typically has an average temperature of 4°C (40°F), with highs reaching up to 18°C (65°F) and lows dropping to around -6°C (22°F).

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

January Precipitation in Castellar del Riu

In Castellar del Riu in January, the precipitation amount is 46 mm (1.8 in) recorded over a span of 5 days.

January Precipitation Trends in Castellar del Riu

The chart displays monthly precipitation patterns in Castellar del Riu, 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 Castellar del Riu, January typically receives around 46 mm (1.8 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 Castellar del Riu

In Castellar del Riu in January, humidity is 79%. With an average temperature of 4°C (40°F), this humidity feels like a chilly dampness that wraps around you, making outdoor activities uncomfortable and leaving you longing for warmth as your breath hangs in the air.

January Average Humidity in Castellar del Riu

This chart illustrates the average monthly humidity levels in Castellar del Riu, 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 Castellar del Riu is approximately 79%, 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 Castellar del Riu

In Castellar del Riu 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 Castellar del Riu, you can check the information here.

Maximum UV Index Levels in Castellar del Riu for January

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

Data source: Castellar del Riu 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 Castellar del Riu Compares to Other Months

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

This table compares monthly weather conditions in Castellar del Riu, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	46 mm (1.8 inches)	79%	moderate
February Weather	7°C (45°F)	60 mm (2.4 inches)	74%	moderate
March Weather	9°C (48°F)	77 mm (3.0 inches)	71%	high
April Weather	11°C (52°F)	114 mm (4.5 inches)	69%	very high
May Weather	16°C (60°F)	113 mm (4.5 inches)	66%	very high
June Weather	19°C (67°F)	107 mm (4.2 inches)	65%	very high
July Weather	23°C (73°F)	58 mm (2.3 inches)	64%	very high
August Weather	22°C (73°F)	83 mm (3.3 inches)	64%	very high
September Weather	18°C (65°F)	86 mm (3.4 inches)	68%	very high
October Weather	14°C (57°F)	121 mm (4.8 inches)	77%	high
November Weather	8°C (47°F)	77 mm (3.0 inches)	79%	moderate
December Weather	5°C (42°F)	31 mm (1.2 inches)	79%	low