Napa Valley Weather Napa Valley September Weather


With September comes the crush. The Napa Valley grape harvest is possibly one of the most popular events in California. The wineries are in full swing as the crush reaches its peak, their doors are open and everyone is invited to witness this massive undertaking first hand. You can enjoy the crush at some of our favorite Napa Valley Wineries.

The weather in September in Napa Valley is fantastic. The average temperature in Calistoga is 69 degrees, with an average high of 88, and an average low of 50 degrees. The average rainfall in Calistoga for September is 0.3 inches.

If you are coming from outside California, you will probably be surprised to learn that September and October can often have periods of temperatures in the 90’s. Regardless of how hot it is during the day, the temperature almost invariably cools down at night.

In the town of Napa, the average temperature in September is 67 degrees, while the average high is 81 degrees and the average low temperature is 52 degrees. The average rainfall for September is 0.4 inches. Temperatures and rainfall in Yountville and Oakville, several miles north of Napa, would be roughly the same as in Napa. Chances will be excellent that you will never see a drop of rain during your visit.

If you are coming to Napa Valley in September, you may want to take a break from your vineyard touring by enjoying our famous mud baths. We have some great last minute spa specials during the month, and we hope to see you in September.