April in Vallejo averages a daily high of 22.5°C with nights around 8.4°C. Expect roughly 4.1 wet days totalling 32.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Vallejo is April–June.
Based on VALLEJO, CA US (6.1km), 1995–2024. 13 years of April data.