March in San Mateo averages a daily high of 16.9°C with nights around 8.9°C. Expect roughly 10.5 wet days totalling 68.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit San Mateo is May–October.
Based on SAN FRANCISCO INTERNATIONAL AIRPORT, CA US (7.2km), 1995–2024. 30 years of March data.