March in San Diego averages a daily high of 19.2°C with nights around 12.2°C. Expect roughly 6.2 wet days totalling 31.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit San Diego is April–November.
Based on SAN DIEGO INTERNATIONAL AIRPORT, CA US (2.6km), 1995–2024. 30 years of March data.