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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 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.
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.
The precipitation varies 121 mm | 5 inch between the driest month and the wettest month. The variation in temperatures throughout the year is 12.3 °C | 22.2 °F. The month with the highest relative humidity is February (74.79 %). The month with the lowest relative humidity is June (49.43 percent).
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.
Currently: 64 °F. Clear. (Weather station: Napa County Airport, USA). See more current weather. Annual Weather Averages Near Napa Valley. Averages are for Napa County Airport, which is 3 miles from Napa Valley. Based on weather reports collected during 1992–2021. Showing: Weather by CustomWeather, © 2024. Need some help?
