The closed upper low will remain to our west through Saturday, as moisture continues to stream in from the east and southeast.
Saturday looks to be cloudy. The GFS and NAM continue with periods of rain, mostly in NJ, but extending into the PHL area. As mentioned, forecast placement of precipitation in closed low situations is often inaccurate and difficult to model. That said, the statistically based MOS (model output statistics) maintains a 50-60% chance of rain each 6 hour period, which is high. So plan on a cloudy, wet day. High 69.
(I think a peek at the short range HRRR model Saturday morning will be needed to update and clarify the actual placement of the showers on Saturday.)
The closed low is expected to lift out on Sunday. Mostly cloudy, maybe some sunny breaks. Still a slight chance of a shower. High 73.
As for Hurricane Matthew, current forecast tracks move it away from the NJ coast, although there are still some statistical ensemble model members that maintain a more westerly track. This hurricane is already taking an unusually southern and western track, though forecast to so. Still needs to be watched