January Weather in Castroville, United States

Last updated: June 24, 2025

In January, the average temperature in Castroville, United States hovers around 12°C (54°F), with a range from a chilly -7°C (21°F) to a warm 28°C (83°F). Expect 34 mm (1.3 in) of precipitation over about 5 days, and prepare for a relatively humid atmosphere with an average humidity of 79%.

January Temperature in Castroville

In January in Castroville, the average temperature is 12°C (54°F). Maximums can reach 28°C (83°F) and minimums can drop as low as -7°C (21°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates January temperature patterns in Castroville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castroville, January typically has an average temperature of 12°C (54°F), with highs reaching up to 28°C (83°F) and lows dropping to around -7°C (21°F).

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

January Precipitation in Castroville

In Castroville in January, the precipitation amount is 34 mm (1.3 in) over the course of 5 days.

January Precipitation Trends in Castroville

The chart displays monthly precipitation patterns in Castroville, 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 Castroville, January typically receives around 34 mm (1.3 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 Castroville

In Castroville in January, humidity is 79%. With an average temperature of 12°C (54°F), this humidity makes traveling feel quite muggy, leading to a sticky discomfort that can sap your energy and make outdoor activities less enjoyable.

January Average Humidity in Castroville

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

In Castroville in January, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Castroville.

Maximum UV Index Levels in Castroville for January

The chart shows the monthly maximum UV Index (UVI) for Castroville 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 Castroville typically reaches 5, which falls under the moderate exposure category.

Data source: Castroville 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 Castroville Compares to Other Months

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

This table compares monthly weather conditions in Castroville, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	34 mm (1.3 inches)	79%	moderate
February Weather	13°C (57°F)	47 mm (1.8 inches)	79%	very high
March Weather	19°C (66°F)	50 mm (2.0 inches)	74%	very high
April Weather	22°C (72°F)	61 mm (2.4 inches)	76%	extreme
May Weather	26°C (79°F)	109 mm (4.3 inches)	81%	extreme
June Weather	29°C (84°F)	58 mm (2.3 inches)	76%	extreme
July Weather	30°C (86°F)	52 mm (2.0 inches)	66%	extreme
August Weather	31°C (87°F)	40 mm (1.6 inches)	58%	extreme
September Weather	28°C (82°F)	106 mm (4.2 inches)	65%	extreme
October Weather	23°C (73°F)	69 mm (2.7 inches)	74%	very high
November Weather	17°C (62°F)	40 mm (1.6 inches)	81%	high
December Weather	14°C (57°F)	46 mm (1.8 inches)	86%	moderate