Sunday was just about a carbon copy to Saturday(albeit the humidity was a touch higher and the wind did not relax in the afternoon); we reached a high of 86 at Philly International Airport in the afternoon after a low of 64. Now mind you that the average high is 87 while the average low is 69 so we're pretty much on par with that.
There were some light rain showers trying to progress eastward before sunset, but fizzling out as they did so; there will be some debris cloudiness overnight with lows in the middle to upper 60s. Come Monday it will warm and humid with highs in the lower 90s thanks to a southwesterly wind around 10mph; there will also be a short wave pushing through in the afternoon so there can be some isolated showers and thunderstorms popping up by the evening commute. Primarily they will be to the north and west, but with such a humid and unstable air mass on top of the region anyone can be fair game.
We'll clear out the clouds overnight with lows in the upper 60s while Tuesday is continued hazy, hot, and humid with highs once again into the lower 90s; as a cold front approaches from the west there will be a better chance for widespread showers and thunderstorms overnight into Wednesday morning with lows in the middle 70s and then Wednesday will feature more showers and thunderstorms with highs around 90(thus making this three days in a row of having temperatures 90 or greater making it a heat wave).
The front stalls just to our south and east so Thursday will start off cloudy, but as drier air works in by the afternoon we'll see sunshine in the afternoon with highs in the middle to upper 80s; we stay in the middle 80s to round out the work week while next weekend looks to be 50/50 with a dry day Saturday while Sunday will feature afternoon showers and thunderstorms.
Of course let's get through this week first and then I'll fine tune the weekend forecast within the next few days; for now you can always follow my 7-day forecast(any time) at