If you planning to travel to Mount Tamalpais State Park, Mill Valley, 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 1:09 PM. The temperature feels like 56.2 with a humidity level of 66 so dress accordingly. Cloud coverage is 4 percent with visibility at 14.7 percent. Today’s UV index is 8, don’t forget the sunscreen if you need it! Today’s winds are traveling northwest at a speed of 13 MPH. At the end of the day don’t miss the sunset at 3:04 AM.