In terms of precipitation, rainfall in Napa Valley ranges from 0.0 - 112.0 inches per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit Napa Valley when rainfall is around 0.0 mm.
If weather is an important factor for your trip to Napa Valley, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 8.0 C).
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