Weather by month
Napa
California
A valley that spends half the year bone dry and golden and the other half green and soaked, with fog creeping up from the bay most mornings.
The best time to come
September and October are the valley at full tilt — warm days, cool nights, and crush going on behind every winery you drive past, which also means the highest rates and the fullest tasting rooms of the year. May buys you similar weather with green hillsides and half the traffic.
The year at a glance
Napa facts
- Sits at about 10 ft above sea level.
- 20.2 in of rain in a typical year, with January the wettest month.
- September runs hottest (80° afternoons); December nights are the coldest (38°).