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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. The coldest month of the year in Napa is January, with an average low of 40°F and high of 56°F.
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.
Napa weather averages and climate Napa, California. Monthly temperature, precipitation and hours of sunshine. A climate graph showing rainfall, temperatures and normals.
The yearly temperature in Napa Valley ranges significantly, from cool winters averaging around 9°C (48°F) to warm summers with average highs around 21°C (70°F). Winter months see about 6 to 7 hours of sunshine per day, which doubles to around 12 hours daily by summer, supporting both leisure and vineyard activities.
Climate Graph Napa and averages California. A Climate Chart and information about the temperature and precipitation
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
Based on annual weather averages for Napa, the best month to go for holiday is January and February. The temperature hovers around 10°c. The table below displays max and min temperature and rain data for the whole year as an average taken from last 12+ years of historical data for Napa.
