September 1, 2014; 9:25 AM ET
San Francisco will see abundant sunshine through at least Thursday. more >
Mainly clear this evening followed by low clouds late
Rises at 6:40 AM with 12:59 of sunlight, then sets at 7:39 PM
Rises at 1:23 PM with 10:29 of moolight, then sets at 11:52 PM
Nov 12, 2012; 5:00 AM ET The UV index has been around since the early 1990s. It was created to help you plan outdoor activities in hopes to limit overexposure to the sun. Jeannette Calle has more.