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If you planning to travel to Union Square, San Francisco, 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 1:15 PM. The temperature feels like 60.5 with a humidity level of 75 so dress accordingly. Cloud coverage is 12 percent with visibility at 12.6 percent. Today’s UV index is 10, don’t forget the sunscreen if you need it! Today’s winds are traveling west at a speed of 13 MPH. At the end of the day don’t miss the sunset at 3:15 AM.