Saturday featured an onshore flow with sunshine quickly giving way to clouds just after the noontime hour; after a morning low of 60 at Philadelphia International Airport(that's six degrees below average) we reached a high of 81 shortly before 3pm(the average high is now 83 so we were pretty much in the ballpark). The clouds were due to warm and moist air pushing northward with a pseudo-warm front(it's not really truly shown). Overnight will remain overcast with some light rain west of I-95; there may even be some patchy fog with lows only around 70 in Center City(upper 60s in the suburbs).
Sunday will feature partial sunshine with showers and thunderstorms popping up in the afternoon; although they will be scattered in nature there isn't really a set timetable when they will occur(so after lunchtime it's fair game). Highs will be at or near 90 with a southerly wind(along the shore it will be in the middle 80s with still a moderate risk of rip currents). Labor Day itself will once again be around 90, but there will be more widespread showers and thunderstorms in the afternoon(some locally heavy rains as well in excess of 1").
That boundary pretty much washes itself out for Tuesday so highs will be once again in the lower 90s with a hazy, hot, and humid day; there will be a cold front draping through the region to provide more widespread showers and thunderstorms in the afternoon. Behind the front temperatures will still be in the middle 80s, but the humidity drops off a bit with a northerly flow. Come Friday another surge of warm air pushes north and the humidity will return with highs around 90 while overnight into Saturday will feature showers and thunderstorms as overnight low will be in the upper 60 while Saturday's high will be in the middle 80s.
That's it for now so continue to enjoy your Labor Day weekend and keep an eye to the sky! Also be sure to keep checking out my 7-day forecast(as well as viewing the satellite and radar maps 24/7) at www.scottderekwx.com/forecast.html.