March in San Rafael averages a daily high of 18.7°C with nights around 6.8°C. Expect roughly 10.8 wet days totalling 150.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit San Rafael is May–October.
Based on KENTFIELD, CA US (2.2km), 1995–2024. 26 years of March data.