weather forecast September 13, 2020 6:35 pm NBC10 First Alert Weather: Mostly Sunny Week Ahead We’re in for mostly sunny conditions this week and comfortable temperatures. NBC10 First Alert Weather meteorologist Krystal Klei has the forecast. US & World Videos 2:16 Clearing out, warming into the 80s 2:35 Warm trend continues, but rain is on the way 2:47 The string of warm days continues 2:32 Warm spring days feeling more like summer 2:43 Philly is warmer than Miami, Florida, Monday