March in Santa Rosa averages a daily high of 18.6°C with nights around 5.7°C. Expect roughly 11.2 wet days totalling 108.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Santa Rosa is May–October.
Based on SANTA ROSA, CA US (1.7km), 1995–2024. 20 years of March data.