If you planning to travel to Empire Mine State Historic Park, Grass 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 2:57 PM. The temperature feels like 41.1 with a humidity level of 93 so dress accordingly. Cloud coverage is 41 percent with visibility at 11.6 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling southeast at a speed of 4 MPH. At the end of the day don’t miss the sunset at 12:44 AM.