April Weather in Castaic, United States

Last updated: June 24, 2025

In April, the average temperature in Castaic, United States hovers around 16°C (62°F). During this time, you can expect a minimum of 5°C (41°F) and a maximum reaching up to 33°C (91°F). Rainfall is modest, with an average precipitation of 22 mm (0.9 in) spread over 3 days. Keep in mind that the average humidity lingers at a comfortable 68%, adding a pleasant touch to your visit.

April Temperature in Castaic

In April in Castaic, the average temperature is 16°C (62°F). The maximum can reach 33°C (91°F), and the minimum can be as low as 5°C (41°F). Be sure to pack for both warm days and cooler nights when traveling during this time.

April Weather in Castaic: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Castaic, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castaic, April typically has an average temperature of 16°C (62°F), with highs reaching up to 33°C (91°F) and lows dropping to around 5°C (41°F).

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

April Precipitation in Castaic

In Castaic in April, the precipitation amount is 22 mm (0.9 in) over a span of 3 days.

April Precipitation Trends in Castaic

The chart displays monthly precipitation patterns in Castaic, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Castaic, April typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

April Humidity in Castaic

In Castaic in April, humidity is 68%. With an average temperature of 16°C (62°F), this humidity feels like a soft blanket enveloping you, making the air feel heavier and the day slightly warmer, which can be refreshing yet occasionally stifling for traveling.

April Average Humidity in Castaic

This chart illustrates the average monthly humidity levels in Castaic, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Castaic is approximately 68%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Castaic

In Castaic in April, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Castaic.

Maximum UV Index Levels in Castaic for April

The chart shows the monthly maximum UV Index (UVI) for Castaic in April, 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 April, the maximum UV index in Castaic typically reaches 10, which falls under the very high exposure category.

Data source: Castaic April 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 April Weather in Castaic Compares to Other Months

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

This table compares monthly weather conditions in Castaic, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	63 mm (2.5 inches)	78%	moderate
February Weather	11°C (52°F)	55 mm (2.2 inches)	82%	high
March Weather	12°C (55°F)	71 mm (2.8 inches)	75%	very high
April Weather	16°C (62°F)	22 mm (0.9 inches)	68%	very high
May Weather	18°C (65°F)	16 mm (0.6 inches)	57%	extreme
June Weather	22°C (72°F)	3 mm (0.1 inches)	52%	extreme
July Weather	25°C (78°F)	1 mm (0.1 inches)	46%	extreme
August Weather	26°C (78°F)	2 mm (0.1 inches)	39%	extreme
September Weather	23°C (74°F)	4 mm (0.2 inches)	48%	very high
October Weather	19°C (66°F)	9 mm (0.3 inches)	59%	high
November Weather	15°C (59°F)	19 mm (0.7 inches)	72%	moderate
December Weather	10°C (51°F)	68 mm (2.7 inches)	76%	moderate