Castaic is a city of approximately 19,000 people in California, United States. Located in the Pacific Time Zone at 34.5°N latitude.
In 2025, Castaic recorded an average annual temperature of 64°F — about 4.8°F above the 30-year normal of 59°F. The hottest day reached 104°F in August; the coldest was 32°F in January. Total precipitation was 26 inches (wetter than usual). The wettest month was December.
View current conditions and forecast for Castaic · More cities in California