Visiting wine country is a fabulous experience and a must do if you’re in the San Francisco/Bay area.   Besides enjoying a glass (or bottle) of vino, Napa and the surrounding region has numerous spots for exquisite dining and jaw-dropping views. Temperature differences between San Francisco and Napa generally vary a lot – the ocean breeze makes for cool temps throughout the year while the valley can get extremely warm in the summer.  Tried and true layers are the way to go.