Castaic Weather Forecast

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Last Updated: March 14, 2026

Castaic is a small community located in Los Angeles County, California.


Summary

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.



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15-Day Weather Outlook


       

5-Day Hourly Forecast Detail

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.