The average high temperature at Philly International is 79 while the average low is 60; we reached 81 this afternoon before 4pm after a low of 56 shortly before 5am. That's pretty much an average early June day and with low humidity it felt great! Unfortunately that's not going to last...
Overnight lows will be in the lower 60s with a mostly clear sky; come Tuesday morning we'll have clouds begin to move in from the west, but showers and thunderstorms won't reach Center City until the evening commute(north and west it may rain as early as after lunchtime). Highs will be in the middle 80s with a southwesterly wind while some thunderstorms may be strong with gusty winds.
The showers and thunderstorms will linger overnight with lows in the middle 60s and by Wednesday afternoon sunshine will appear as we dry out and highs are around 80. Another quick-moving front pushes through early Thursday morning with a threat of showers and thunderstorms as highs will be in the upper 70s, but behind it it's much cooler with highs in the lower 70s.
You can check out the rest of the 7-day forecast(any time) at www.scottderekwx.com/forecast.html.