PHILADELPHIA - Summer isn’t officially here yet, but the heat is on with temperatures expected to reach 90 degrees Tuesday.After a milder day Monday, FOX 29’s Sue Serio is calling for more sunshine and highs in or near the 90s by early this afternoon.Expect more of the same conditions Wednesday with some more clouds and humidity lingering.Thursday will be our best chance for a cool down during the work week with showers and storms possible and highs in the mid-80s.For the latest forecast, download the FOX 29 Weather Authority app.____AdvertisementFor the latest local news, sports and weather, download the FOX 29 News app.DOWNLOAD: FOX 29 NEWS APP .