Napa Valley Weather: Napa Valley August Weather
August in the Wine Country means summer and with it a tapestry of beautiful green hues as the grapevines mature. During the summer months the temperatures in the Napa Valley vary greatly from those in San Francisco. While one may experience chilly foggy days and nights in San Francisco during the summer, a short drive to the Napa Valley will reward with average daytime temperatures in the 90's with very temperate nights
In the town of Napa, the average temperature in August is 68 degrees, while the average high is 81 degrees and the average low temperature is 54 degrees. The average rainfall for August is 0.1 inches. Temperatures and rainfall in Yountville and Oakville, several miles north of Napa, would be roughly the same as in Napa.
In August, the average temperature in Calistoga is 71 degrees, the average high is 88, and the average low is 52 degrees. The average rainfall in Calistoga for August is 0.1 inches. These figures reflect a close approximation to those in St. Helena, just eight miles south of Calistoga.
The summer sky is virtually always blue and cloudless, and there is almost zero chance of rain from June through mid-September. Visitors from the east will immediately notice that the air is dry, and rarely humid. Napa Valley summer nights are almost invariably cool, with temperatures in the comfortable 50-65 degree range, so most often there is little need for air conditioning while you sleep. It is no wonder that the Napa Valley has been a favorite destination since the 1800's when Robert Louis Stevenson immortalized Calistoga and sang it's praises in his book "The Silverado Squatters.
No matter what time of year you choose to visit Napa Valley, you will find that the Mediterranean climate is without parallel. Throughout Napa Valley, and especially in Calistoga, you will find al fresco dining, wineries, hiking, excellent shopping, spa treatments and lodging all within walking distance. There is no better climate in California to enjoy these countless activities.
Whatever the weather, come on up! We’re waiting for you!