From Fox29:

The high pressure system that will clear our skies tonight will also bring
sunshine and pleasant highs in the seventies on Friday. A tiny taste of
summery weather on Saturday as we climb to the upper 70s!
But don't get used to it. A cold front is set to travel through the region
by Saturday evening, with showers and a few thunderstorms (no more flooding
expected).
The air behind it is a blast from Canada, so get ready for sweater-weather
on Sunday, and into next week!

I got the previous report from a Reading AM radio station, which got its info
from the national weather service. As of 4:00 this morning, they are calling
for "scattered showers in the morning, with numerous thunderstorms developing
in the afternoon. chance of rain 80%" for Saturday. That report was for
Reading/Berks, so maybe down Philly way, you wont get as much as we will. If
you do go out, good luck and stay dry.

-Zimmy