PHILADELPHIA - The first day of fall promises to be dry with sunshine and temperatures in the low 70s across the region.Come Wednesday, fall will be heating up as highs are expected to reach 80 degrees Wednesday, and the upper 70s both Thursday and Friday.Taking a look at the weekend, expect highs in the mid-70s and low-80s Saturday and Sunday.For the latest forecasts and conditions download the FOX 29 Weather Authority app.___For the latest local news, sports and weather, download the FOX 29 News app.AdvertisementDOWNLOAD: FOX 29 NEWS APPSign up for emails from FOX 29, including our daily Good Day Digest newsletter!.