If you planning to travel to Hetch Hetchy Reservoir, Groveland, 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 47.3 with a humidity level of 46 so dress accordingly. Cloud coverage is 47 percent with visibility at 14.9 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling east-southeast at a speed of 7 MPH. At the end of the day don’t miss the sunset at 12:49 AM.