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The warm season lasts for 4.4 months, from May 31 to October 12, with an average daily high temperature above 77°F. The hottest month of the year in Napa is July, with an average high of 82°F and low of 56°F. The cool season lasts for 2.4 months, from November 28 to February 10, with an average daily high temperature below 60°F.
Average temperatures hover around 60 degrees during the day, dropping down into the 40s and sometimes 30s at night. Though you won’t find snow, precipitation is somewhat frequent, so don’t forget an umbrella and a rain jacket. Average High/Low: 60°F / 42°F. Average Rainfall: 5.1″.
Napa Temperatures: Averages by Month. The numbers here tell you how hot and cold the weather usually is in Napa, California during each month of the year. The average high and low temperatures are listed below for Napa, in both degrees Fahrenheit and Celsius.
In Napa, the climate is warm and temperate. The winters are rainier than the summers in Napa. The climate here is classified as Csc by the Köppen-Geiger. The temperature in this location is approximately 15.0 °C | 59.0 °F, as determined by statistical analysis.
Plan your visit with detailed insights on the climate in Napa (CA) by month. Get accurate forecasts for Napa temperature & weather by month, days, & hours.
Napa Valley in December. December is a winter month. In Napa you can expect moderate maximum average daytime temperatures around 14°C and nighttime temperatures around 4°C. On average, this month is the coldest month of the year in Napa Valley. Find more detailed climate information for Napa Valley in December here.
Hottest Month: August (67 °F avg) Coldest Month: December (47 °F avg) Wettest Month: December (4.51" avg) Windiest Month: July (18 mph avg) Annual precip. 22.14"
