Traveling to Mumm Napa, St. Helena, California? Here is your 6-day weather forecast in the area. Whether it is a warm weather destinations or cold climate don’t forget to consider weather, while you pack your bags for this trip. Start your day when the sunrises at 2:57 PM and don’t miss the sunset at 12:53 AM. Today’s winds are traveling south-southeast at a speed of 11 MPH. The temperature feels like 48 with a humidity level of 97. Cloud coverage is 96 percent with 2.3 percent visibility. Today’s UV index is 0 make sure to prepare properly. Make sure to plan your travel itinerary to match your travel weather forecast to make the most of your vacation with Reservations.com.