Napa, CA Climate


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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

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Napa is 8.4 (10=best), which means it is more comfortable than most places in California.

9.5 Summer - 7.2 Winter
July, September and August are the most pleasant months in Napa, while January and December are the least comfortable months.

  ClimateNapa, CaliforniaUnited States
  27.3 in.38.1 in.
  0.0 in.27.8 in.
  68.6 days106.2 days
  260 days205 days
  20 ft.2443 ft.

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for Napa with an average high temperature of 83.0°, which ranks it as cooler than most places in California. In Napa, there are 7 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Napa are October, May and June.
In Napa, there are 24.6 days annually when the high temperature is over 90°, which is cooler than most places in California.
December has the coldest nighttime temperatures for Napa with an average of 37.4°. This is about average compared to other places in California.
In Napa, there are 21.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.
In Napa, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.
Humidity in Napa is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.
February is the wettest month in Napa with 5.4 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 27.3 inches in Napa means that it is wetter than most places in California.
December is the rainiest month in Napa with 12.0 days of rain, and July is the driest month with only 0.1 rainy days. There are 68.6 rainy days annually in Napa, which is rainier than most places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 2% chance of a rainy day.
There is rarely any recorded snowfall in Napa, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Napa.
Reviews for Napa
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I have lived in Napa for 20 years. In that time, Napa has changed dramatically. Today, Napa is very much a Hispanic community. Many Latinos don't or won't speak English  More

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My longtime Napa home burned to smithereens in 2017. That same night, a crazy stalker set her sights on me. Two nights after the fire, she showed up at my rescue house  More

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Napa is a very easy place to live, especially for those contemplating retirement. The pace of life is peaceful. The weather is superb -- never miserably cold or hot but  More

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