April in San Diego averages a daily high of 20.1°C with nights around 13.5°C. Expect roughly 3.9 wet days totalling 15.8mm. 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 April data.