June in the Napa Valley is a time to anticipate the summer months ahead. You are sure to experience warm weather and most nights will be pleasantly cool. Since many of the valley restaurants have outdoor seating, it is the perfect time to enjoy a dinner al fresco. Although you will probably not see any rain during your visit, the nights are still likely to be cool, so you may want to bring a light sweater for evening.
In June, the average temperature in Calistoga is 68 degrees, with an average high of 86, and an average low of 50 degrees. The average rainfall in Calistoga for June is 0.22 inches. June 2013 brought a rare sight in the Napa Valley: lightning storms! With over 200 strikes in the surrounding areas, the sky was an amazing show of natural beauty.
In the town of Napa, the average temperature in June is 66 degrees, while the average high is 78 degrees and the average low temperature is 51 degrees. The average rainfall for June is 0.3 inches. Temperatures and rainfall in Yountville and Oakville, several miles north of Napa, would be roughly the same as in Napa.
In short, June is a fantastic month to visit Napa Valley. The temperatures are generally mild, but not yet hot, and the summer tourist season does not begin in earnest until after July 4th. June is also a perfect month to plan a Napa Valley picnic, and you might want to take advantage of our new picnic area and bocce courts which we opened in May 2013.