December in Santa Cruz averages a daily high of 15.8°C with nights around 5.3°C. Expect roughly 10.7 wet days totalling 164.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Santa Cruz is May–October.
Based on SANTA CRUZ, CA US (3.2km), 1995–2024. 26 years of December data.