In terms of precipitation, rainfall in Napa Valley ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit Napa Valley when rainfall is around 0.0 in.
If weather is an important factor for your trip to Napa Valley, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 46.4 F).
Oakland International Airport is south of the center of Oakland by about five miles. You’ll find flights with Southwest, Alaska, Spirit, Hawaiian and JetBlue operating through this airport.
Southwest Airlines provides about half of the flights that go into Sacramento International Airport. It’s located about 10 miles from downtown Sacramento.
The closest airport is Sonoma County Airport. Its flights mainly come through Alaska Airlines. This is your primary option for landing close to Napa Valley. There is Napa County Airport too that is just 10 minutes from the Napa Valley, however, it does not service any commercial flights.
There are more and cheaper options going into Oakland. You can fly on Spirit or JetBlue to go to Oakland from four different airports in LA. The trip is about 1h 20m.
Stopovers going to Oakland or Sacramento could include Salt Lake City, Las Vegas, Phoenix, Seattle, or Portland.