May in Carlsbad averages a daily high of 21.3°C with nights around 12.5°C. Expect roughly 3.6 wet days totalling 8.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Carlsbad is April–October.
Based on OCEANSIDE MUNICIPAL AIRPORT, CA US (6.8km), 1995–2024. 24 years of May data.