December in Santa Ana averages a daily high of 20.8°C with nights around 8.8°C. Expect roughly 6 wet days totalling 60mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Santa Ana is April–July.
Based on SANTA ANA FIRE STATION, CA US (0.2km), 1995–2024. 30 years of December data.