The temperatures will be in the 50s for the region on Saturday under sunny skies, but then strap on a seatbelt for a roller ride of temperatures change the next several days.

“A mild period starts the weekend with highs likely well into the 50s for much of the region Saturday, helping along the snow melt,” the NWS afternoon forecast discussion stated Friday. “A cold front will then advance into the region Saturday night, stalling out as it does so. A wave of low pressure then moves eastward to our north during the morning Sunday, producing some spotty showers of rain and snow, especially across the northern areas (Poconos/NW NJ) where a small accumulation is possible.”

County highs Saturday are predicted to reach 52-55 in Berks, 54-56 in Chester, 54-55 in Delaware, 51-56 in Montgomery, around 55 in Philadelphia and 51-52 in Mercer County, N.J.

That cold front moving through Saturday night dips the temperatures to around freezing in the Philly region.

“Behind the front, we`ll see a return of winter, at least for a day or two, with temps falling below normal again,” the NWS discussion continued. “Highs will be about 5 degrees lower on Sunday across the southern Delmarva, closer to 10 degrees lower across the bulk ofthe area including metro Philly, but up to 15 degrees lower in the Poconos.”

The cold is forecast to stick around for Monday and Tuesday, the NWS said, with a small chance of some snow Monday night into Tuesday. Then a significant warm up looks like it will arrive midweek.

National Weather Service forecast

Saturday: Patchy fog before 7 a.m. Otherwise, mostly sunny, with a high near 55. Calm wind becoming southwest around 5 mph.

Saturday night: Increasing clouds, with a low around 33. Calm wind becoming east around 5 mph.

Sunday: A chance of showers before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 43. Northwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

Sunday night: Mostly cloudy, with a low around 19. North wind 5 to 10 mph, with gusts as high as 20 mph.

Monday: A slight chance of snow after 1pm. Mostly cloudy, with a high near 33. Chance of precipitation is 20%.

Monday night: A chance of snow and freezing rain after 1am. Mostly cloudy, with a low around 20. Chance of precipitation is 30%.

Tuesday: A chance of rain, snow, and freezing rain before 1pm, then rain likely. Cloudy, with a high near 40. Chance of precipitation is 60%.

Tuesday night: Rain likely. Cloudy, with a low around 35. Chance of precipitation is 70%.

Wednesday: A chance of rain before 1pm. Cloudy, with a high near 50. Chance of precipitation is 30%.