If you planning to travel to Alston Park, 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 2:38 PM. The temperature feels like 55.95 with a humidity level of 85 so dress accordingly. Cloud coverage is 34 percent with visibility at 11 percent. Today’s UV index is 4, don’t forget the sunscreen if you need it! Today’s winds are traveling west at a speed of 5 MPH. At the end of the day don’t miss the sunset at 1:08 AM.