September 4, 2015; 1:15 PM ET
A backdoor front will trim temperatures, haze and humidity around Philadelphia early this weekend before all three conditions build by early next week. more >
Humid with times of clouds and sun; a shower or thunderstorm in spots this afternoon
Rises at 6:34 AM with 12:57 of sunlight, then sets at 7:31 PM
Rises at 11:42 PM with 14:32 of moolight, then sets at 2:14 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.