January Weather in Castroville, United States

Last updated: June 24, 2025

In January, the average temperature in Castroville, United States hovers around 11°C (52°F). You're likely to experience a minimum of 2°C (35°F) and a maximum of 21°C (71°F) throughout the month. Be prepared for about 105 mm (4.1 in) of precipitation spread over 7 days, along with a notable average humidity level of 82%.

January Temperature in Castroville

In January in Castroville, the average temperature is 11°C (52°F). The maximum can reach 21°C (71°F), and the minimum can be as low as 2°C (35°F). Be prepared for a mild climate, suitable for outdoor activities, but pack layers for cooler evenings.

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 11°C (52°F), with highs reaching up to 21°C (71°F) and lows dropping to around 2°C (35°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 105 mm (4.1 in) over a period of 7 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 105 mm (4.1 inches) of precipitation spread over approximately 7 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 82%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress in layers and stay prepared for the moisture-laden air as you explore your surroundings.

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 82%, 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 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Castroville for better planning.

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 4, 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	11°C (52°F)	105 mm (4.1 inches)	82%	moderate
February Weather	11°C (52°F)	85 mm (3.4 inches)	84%	moderate
March Weather	12°C (53°F)	87 mm (3.4 inches)	82%	very high
April Weather	13°C (55°F)	31 mm (1.2 inches)	78%	very high
May Weather	14°C (57°F)	21 mm (0.8 inches)	71%	extreme
June Weather	16°C (60°F)	2 mm (0.1 inches)	64%	extreme
July Weather	16°C (61°F)	2 mm (0.1 inches)	58%	extreme
August Weather	17°C (63°F)	2 mm (0.1 inches)	54%	very high
September Weather	17°C (63°F)	6 mm (0.2 inches)	55%	very high
October Weather	16°C (60°F)	19 mm (0.7 inches)	62%	high
November Weather	13°C (56°F)	39 mm (1.5 inches)	78%	moderate
December Weather	11°C (52°F)	87 mm (3.4 inches)	80%	moderate