April in Tustin averages a daily high of 23.5°C with nights around 12°C. Rain is rare — about 2.8 wet days and 19.9mm across the month. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Tustin is April–July.
Based on SANTA ANA FIRE STATION, CA US (3.8km), 1995–2024. 29 years of April data.