February in Vacaville averages a daily high of 16.9°C with nights around 4.6°C. Expect roughly 8.6 wet days totalling 106.3mm. Generally workable, with some weather to plan around.
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 February data.