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 1:58 PM. The temperature feels like 58.65 with a humidity level of 83 so dress accordingly. Cloud coverage is 43 percent with visibility at 9.4 percent. Today’s UV index is 4, don’t forget the sunscreen if you need it! Today’s winds are traveling west-southwest at a speed of 9 MPH. At the end of the day don’t miss the sunset at 2:05 AM.