February in Napa averages a daily high of 17.3°C with nights around 5.2°C. Expect roughly 10.1 wet days totalling 125.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Napa is April–October.
Based on NAPA STATE HOSPITAL, CA US (2.8km), 1995–2024. 29 years of February data.