the Napa Valley in the United States of America sees its peak temperatures in September (30°C (86°F)) and its coolest in December (14°C (57°F)). For a full breakdown of what to expect throughout the year, we've put together a climate overview based on data from Napa, the region's most visited city. For more detailed climate information about other cities in the area, please see the section beneath the map further down the page.
The weather in the Napa Valley during March, April, May, October and November is comfortably warm, with average temperatures ranging from 19°C (66°F) to 26°C (79°F).
When it comes to rainfall, the Napa Valley sees significant variations throughout the year. December tends to be the wettest, receiving 120 mm (4.7 in) of rain, while July is much drier with just 0 mm (0 in). For those seeking drier weather, May, June, July, August and September typically see minimal rainfall, never exceeding 16 mm (0.6 in).
Visitors hoping to maximize their time in the sun should consider planning their trip for May, when daylight hours are at their peak.
