January Weather in Castelo, Brazil

Last updated: August 22, 2025

In Castelo, Brazil, the average temperature in January hovers around 25°C (77°F). Expect a comfortable range, with minimums dipping to 17°C (63°F) and maximums soaring to 35°C (95°F). However, be prepared for some rain, as 86 mm (3.4 in) of precipitation usually falls over 9 days. The air tends to feel quite humid, with averages around 80%.

January Temperature in Castelo

In January in Castelo, the average temperature is 25°C (77°F), with maximums reaching 35°C (95°F) and minimums dropping to as low as 17°C (63°F). This mild climate makes Castelo an ideal destination for travelers seeking pleasant weather and outdoor activities.

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

The chart illustrates January temperature patterns in Castelo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelo, January typically has an average temperature of 25°C (77°F), with highs reaching up to 35°C (95°F) and lows dropping to around 17°C (63°F).

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

January Precipitation in Castelo

In Castelo in January, the precipitation amount is 86 mm (3.4 in), falling over the course of 9 days.

January Precipitation Trends in Castelo

The chart displays monthly precipitation patterns in Castelo, 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 Castelo, January typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 9 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 Castelo

In Castelo in January humidity is 80%. With an average temperature of 25°C (77°F), this humidity feels like traveling through a warm, tropical rainforest where the air is thick and steamy, making even the simplest stroll feel like a workout.

January Average Humidity in Castelo

This chart illustrates the average monthly humidity levels in Castelo, 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 Castelo is approximately 80%, 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 Castelo

In Castelo in January, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Castelo.

Maximum UV Index Levels in Castelo for January

The chart shows the monthly maximum UV Index (UVI) for Castelo 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 Castelo typically reaches 16, which falls under the extreme exposure category.

Data source: Castelo 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 Castelo Compares to Other Months

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

This table compares monthly weather conditions in Castelo, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	25°C (77°F)	86 mm (3.4 inches)	80%	extreme
February Weather	24°C (75°F)	176 mm (6.9 inches)	85%	extreme
March Weather	23°C (74°F)	131 mm (5.1 inches)	86%	extreme
April Weather	22°C (71°F)	76 mm (3.0 inches)	85%	extreme
May Weather	20°C (68°F)	46 mm (1.8 inches)	82%	very high
June Weather	19°C (67°F)	24 mm (1.0 inches)	81%	high
July Weather	18°C (64°F)	18 mm (0.7 inches)	79%	very high
August Weather	18°C (65°F)	33 mm (1.3 inches)	75%	very high
September Weather	21°C (70°F)	50 mm (2.0 inches)	72%	extreme
October Weather	22°C (72°F)	114 mm (4.5 inches)	66%	extreme
November Weather	22°C (71°F)	167 mm (6.6 inches)	69%	extreme
December Weather	23°C (74°F)	175 mm (6.9 inches)	72%	extreme