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Castaic Weather Forecast

Last Updated: November 12, 2025

Get the latest Weather Forecast, Climate, and Recreation for Castaic in Castaic is a small community located in Los Angeles County, California. Updated daily.


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The region has a Mediterranean climate, which means that summers are hot and dry, while winters are mild and rainy. Castaic is primarily known for its reservoir which is a part of the California State Water Project. The reservoir is fed by the Santa Clara River and has a capacity of 323,000 acre-feet. The region supports a variety of outdoor recreation activities, including hiking, camping, boating, and fishing. The Castaic Lake State Recreation Area is a popular destination for outdoor enthusiasts, with opportunities for picnicking, swimming, and water sports. Additionally, the area has several trails that offer stunning views of the mountains and the lake.

       

Weather Forecast

Castaic receives approximately 452mm of rain per year, with humidity levels near 72% and air temperatures averaging around 18°C. Castaic has a plant hardyness factor of 9, meaning plants and agriculture in this region tend to thrive here all year round.