March in Vacaville averages a daily high of 19.5°C with nights around 6.5°C. Expect roughly 9.2 wet days totalling 83.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Vacaville is April–May.
Based on VACAVILLE NUT TREE AIRPORT ASOS, CA US (3.4km), 1995–2024. 26 years of March data.