From the National Weather Service:
Another hot day is ahead with highs in the 80s to around 90, although the humidity will be low. If you're planning to spend the day at the beach, highs will top out in the upper 70s to lower 80s. Don't forget the sunscreen and remember to stay hydrated!
It will be hot and noticeably more humid on Saturday with highs once again in the 80s to around 90. Showers and thunderstorms are expected during the afternoon and at night before a cold front crosses the region.
Be aware that thunderstorms will be capable of producing torrential rainfall which could cause flooding.
The holiday weekend will end on a cooler and less humid note with plenty of sunshine and highs in the 70s to lower 80s.