We reached 88 at Philly International Airport Monday afternoon after a low of 68; this was under morning clouds with rain to the north and west and sunshine by the late morning that gave way to a mostly cloudy afternoon. Overnight will feature just a few clouds with lows in the upper 60s to around 70 with a light southerly wind.
Tuesday will be sunny with some clouds to the west once we reach out convective temperature(the estimated temperature that the surface must reach for clouds to develop). Highs will be in the lower 90s with a continued southerly wind between 10-15mph. There may be a few isolated showers and thunderstorms well north and west, but otherwise we're dry. After a very muggy overnight with lows just into the lower and middle 70s we'll be in the middle 90s with continued hazy, hot, and humid conditions. A more potent cold front will inch closer to the region so showers and thunderstorms will pop up by the evening commute. The front will take its time to push on through so not only Thursday will feature scattered showers and thunderstorms with highs in the lower 90s Independence Day will also be wet(albeit temperatures will be scaled back into the lower 80s as the cooler air works through).
Now since the tropical feature to the south will essentially be steered off of the Carolina coastline by the weekend, it's still close enough to enhance moisture and push it northward; this is why we may see 1, 2 to even 3" of rain from Wednesday night through Friday as this is called a Predecessor Rain Event.
Anyway, this all clears out by Saturday so the rest of the weekend is dry with highs into the middle 80s; you can check out the rest of the 7-day forecast(any time) at www.scottderekwx.com/forecast.html.