January Weather in Castro, Brazil

Last updated: August 22, 2025

In January, the average temperature in Castro, Brazil is a comfortable 21°C (70°F). Visitors can expect a minimum temperature of 13°C (56°F) and enjoy highs reaching up to 31°C (89°F). However, be prepared for occasional rain, as the area receives an average of 193 mm (7.6 in) of precipitation over 21 days. With an average humidity of 85%, it's recommended to stay hydrated while exploring!

January Temperature in Castro

In January in Castro, the average temperature is 21°C (70°F), with maximums reaching up to 31°C (89°F) and minimums dropping as low as 13°C (56°F). This moderate climate makes Castro an ideal destination for travelers looking to enjoy pleasant outdoor activities.

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

The chart illustrates January temperature patterns in Castro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castro, January typically has an average temperature of 21°C (70°F), with highs reaching up to 31°C (89°F) and lows dropping to around 13°C (56°F).

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

January Precipitation in Castro

In Castro in January, the precipitation amount is 193 mm (7.6 in) spread over 21 days.

January Precipitation Trends in Castro

The chart displays monthly precipitation patterns in Castro, 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 Castro, January typically receives around 193 mm (7.6 inches) of precipitation spread over approximately 21 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 Castro

In Castro in January, humidity is 85%. With an average temperature of 21°C (70°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel slightly stifling and requiring frequent breaks to refresh in the shade or near water.

January Average Humidity in Castro

This chart illustrates the average monthly humidity levels in Castro, 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 Castro 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 Castro

In Castro 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 Castro.

Maximum UV Index Levels in Castro for January

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

Data source: Castro 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 Castro Compares to Other Months

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

This table compares monthly weather conditions in Castro, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	21°C (70°F)	193 mm (7.6 inches)	85%	extreme
February Weather	21°C (70°F)	136 mm (5.3 inches)	80%	extreme
March Weather	20°C (69°F)	132 mm (5.2 inches)	80%	extreme
April Weather	18°C (65°F)	49 mm (1.9 inches)	77%	extreme
May Weather	16°C (61°F)	74 mm (2.9 inches)	76%	very high
June Weather	15°C (59°F)	102 mm (4.0 inches)	74%	high
July Weather	14°C (57°F)	28 mm (1.1 inches)	66%	high
August Weather	15°C (59°F)	74 mm (2.9 inches)	57%	very high
September Weather	18°C (65°F)	65 mm (2.6 inches)	58%	extreme
October Weather	19°C (66°F)	166 mm (6.5 inches)	60%	extreme
November Weather	19°C (67°F)	106 mm (4.2 inches)	78%	extreme
December Weather	21°C (69°F)	176 mm (6.9 inches)	86%	extreme