warm beaches
Warmest Beach in Winter. California's best beaches for warm winter weather are along the southern coast, particularly south-facing shores. The warmest temperatures happen at Avila Beach, Long Beach and Laguna Beach where the days get up to at least 67 degrees F (19 Â°C) on average in December and January.
Warm days in winter also occur at Imperial Beach, San Diego, Oxnard, Santa Barbara and Morro Bay where temperatures typically reach the mid-60s each day. Warmest Beaches in Northern California. On California's northern coast, the year's warmest weather usually arrives in September.