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Over the course of the year, the temperature typically varies from 39°F to 83°F and is rarely below 30°F or above 92°F. Based on the tourism score, the best time of year to visit Napa for warm-weather activities is from late June to mid September. Napa weather by month. Click on each chart for more information.
Napa weather averages and climate Napa, California. Monthly temperature, precipitation and hours of sunshine. A climate graph showing rainfall, temperatures and normals.
Currently: 51 °F. Light rain. Overcast. (Weather station: Napa County Airport, USA). See more current weather. Averages are for Napa County Airport, which is 3 miles from Napa Valley. Based on weather reports collected during 1992–2021. Annual precip. Need some help?
With an average of 20.9 °C | 69.7 °F, July is the warmest month. The lowest average temperatures in the year occur in January, when it is around 8.6 °C | 47.5 °F.
Detailed temperature information for Napa, California with data for average monthly highs and lows plus number of days with hot or cold weather.
Napa Valley enjoys mild weather year-round, but winter brings the coldest temperatures. While daytime temperatures rarely drop below 55 degrees between January and March, average lows range between 38 – 40 degrees F at night.
This page shows the average temperature in each month of the year in Napa, California. It is based on NOAA data for the years 1991–2020. What's the Hottest Month in Napa? In Napa, California, the warmest month is August, with an average daily high temperature of 80.5 °F and an average low of 53.8 °F. What's the Coldest Month in Napa?
