Our cool regime will continue into the early parts of this week as a frontal boundary crosses the region overnight and early tomorrow. The front produced a pretty decent slug of rain through the Midwest yesterday with half to one inch rains in association with its passage through Minnesota. The front probably doesn't maintain that same level of moisture and energy as it moves east but there will be enough energy and moisture that hold to produce some rain across the region later tonight and tomorrow as it passes through the region.
Modeling indicates the front should arrive into the western parts of the region around midnight, passing through over the course of the night. Showers lag the front's passage and will work through into the early morning hours. These shouldn't be significant but it should be enough to dampen the ground a bit overnight.
Monday features a bit of a breeze and varying amounts of sunshine. The morning shower threat (as depicted below) pushes off the coast, leaving us a several hour window of decent weather. More showers may move through the Poconos and North Jersey later in the day as the northerly flow behind the front pushes that band of showers in Upstate New York to the south and southeast. It's not likely that those showers survive to Philadelphia but a few sprinkles could occur to Allentown, with an increased chance as one moves north and east from there.
This upcoming front sets up a cool Tuesday before we begin a slow, steady recovery for Wednesday through Saturday. We *could* flirt with 80 by week's end for a high.
Until then, however, a few more cool days await.