If you planning to travel to Sterling Vineyards, Napa, California, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 1:29 PM. The temperature feels like 69.1 with a humidity level of 60 so dress accordingly. Cloud coverage is 6 percent with visibility at 14.6 percent. Today’s UV index is 9, don’t forget the sunscreen if you need it! Today’s winds are traveling west at a speed of 4 MPH. At the end of the day don’t miss the sunset at 2:55 AM.