March in the Napa Valley is a fantastic time to visit. The promise of spring with verdant green hills and the early blossoms show the Wine Country visitor that the seasons here are mild and inviting. When coming to Napa Valley in March, bring clothing to layer, as the weather is changeable.
In March, the average temperature in Calistoga is 54 degrees, with an average high of 67, and an average low of 41 degrees. The average rainfall in Calistoga for March is 5.7 inches. These figures reflect a close approximation to those in St. Helena, just eight miles south of Calistoga.
In March, temperatures may rise to near 80. March is also unpredictable, with 2004 and 2005 seeing peaks of 89 degrees, while 2012 saw a low of 24 degrees. March weather in 2014 was ideal, with high temperatures between 70 and 80 from March 7-20.
In early March, don’t miss the Napa Valley Marathon as it attracts runners from near and far. The course winds south from Calistoga down the Silverado Trail to Napa through one of the most beautiful grape growing regions in the world.