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 3:05 PM. The temperature feels like 56.55 with a humidity level of 83 so dress accordingly. Cloud coverage is 7 percent with visibility at 15 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling southeast at a speed of 6 MPH. At the end of the day don’t miss the sunset at 12:51 AM.