Napa, CA enjoys a perfect Mediterranean climate with warm summers and mild winters. Average summer temperatures in Napa are typically in the mid-70s to high 80s Fahrenheit while winter temperatures range from lows in the upper 30s to highs in the mid-50s. The area also experiences a good amount of rainfall throughout the year, averaging several inches per month. This combination makes for ideal growing conditions, allowing Napa Valley's renowned vineyards and wineries to flourish.
Napa, California gets 27 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Napa averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 260 sunny days per year in Napa. The US average is 205 sunny days.
Napa gets some kind of precipitation, on average, 69 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 82 degrees
Winter Low: the January low is 38
Rain: averages 27 inches of rain a year
Snow: averages 0 inches of snow a year