St Helena Chamber of Commerce St. Helena is located in the center of the Napa Valley wine growing region about 60 miles north of the San Francisco Bay Area and about 90 miles west of Sacramento. The population of St. Helena is approximately 5,200 permanent residents along with many semi-permanent vacation homes in the area. The Napa Valley enjoys warm, dry summer days with cool evenings and early morning fog.
Winters are relatively mild with some frosty mornings in the early spring.
Rainy season is from November to April with the most rain falling in February and March. Leading employment groups are the wine industry and tourism. Check our site for all your needs, whether just passing through or staying with us for a while. Early settlers to the Napa Valley discovered the ideal climate and diverse soil types perfect for growing various varieties of grapes. In 1858, Charles Krug began the first really focused effort in wine production.