Weather
Southeast Pennsylvania Weather Alert: Cold Weekend, Warmer Monday Oct 18-19
Philadelphia, PA – A noticeably colder weekend is approaching southeastern Pennsylvania, with temperatures expected to fall into the upper 30s before gradually recovering early next week. The National
By Elliot Vaughn · 2026-10-16T07:17:56.626Z
Philadelphia, PA – A noticeably colder weekend is approaching southeastern Pennsylvania, with temperatures expected to fall into the upper 30s before gradually recovering early next week. The National Weather Service projects a low near 37 degrees Saturday night, Oct. 17, followed by sunny but cool conditions Sunday, Oct. 18. The change comes after Friday's projected high of 81 degrees, creating a 44 degree difference between the daytime warmth and the weekend's coldest forecast temperature. Residents planning outdoor activities should prepare for a distinctly cooler stretch.
According to the National Weather Service in Philadelphia, Saturday will bring partly sunny skies and a high near 54 degrees as colder air settles across the region. North winds around 15 mph could gust as high as 30 mph, adding to the chilly conditions. Temperatures are expected to fall to approximately 37 degrees Saturday night, with mostly clear skies and north winds around 10 mph. Sunday will offer some improvement, although the afternoon high is expected to reach only 57 degrees.
Chilly Weekend Gives Way to a Gradual Recovery The most significant change will be felt heading into Sunday morning, when temperatures near the upper 30s could make early outdoor activities noticeably uncomfortable. The forecast does not currently establish freezing conditions in Philadelphia itself, with the projected low remaining five degrees above 32. However, residents in surrounding communities should monitor their specific local forecasts because temperatures can vary across southeastern Pennsylvania, particularly away from the urban core.
Sunday afternoon should bring more favorable conditions as sunshine returns and temperatures climb into the upper 50s. The improvement will be gradual rather than immediate, with another cool night expected before the workweek begins. Sunday night's low is forecast near 42 degrees under mostly clear skies. For residents attending outdoor events, walking along the Delaware River waterfront or spending time in neighborhood parks, the difference between afternoon sunshine and early morning temperatures could be considerable.
What the Weather Means for Travel and Outdoor Plans The weekend transition follows an unsettled Friday, when showers and possible thunderstorms are expected before colder air arrives. Friday's precipitation probability is 60%, increasing to 80% Friday night, with thunderstorms possible before 10 p.m. Northwest winds around 15 mph are expected Friday night. The changing conditions could create wet pavement and reduced visibility during heavier showers, particularly along Interstate 95, Interstate 76 and other heavily traveled corridors.
By Saturday, rain is no longer included in the supplied Philadelphia point forecast, but gusty north winds could remain noticeable on exposed roads and bridges. Motorists should allow for changing conditions following Friday's wet weather, although no specific highway closures or widespread disruptions are established by the forecast. Travelers heading toward New Jersey or surrounding Pennsylvania suburbs should also check localized conditions, since the Philadelphia point forecast does not establish identical temperatures or wind speeds across the entire region.
Temperatures Rebound Heading Into Next Week Monday, Oct. 19, marks the beginning of a modest warming trend, with mostly sunny skies and temperatures reaching approximately 60 degrees. Monday night should remain partly cloudy, with a low near 46 degrees. By Tuesday, Oct. 20, afternoon temperatures are expected to reach 66 degrees under mostly sunny skies, providing a considerably milder feel compared with the weekend's coldest period.
The warmer pattern continues Wednesday, Oct. 21, when the National Weather Service expects sunshine and a high near 66 degrees. Thursday's high is projected near 63 degrees, with mostly sunny skies. No additional significant storm system is identified in the supplied Philadelphia forecast through Thursday, although conditions beyond that period remain unconfirmed. Residents planning activities next week can expect a generally drier and milder stretch based on the available outlook.
Are you ready for temperatures near 37 degrees this weekend, or were you hoping Philadelphia's warmer weather would last longer?
Five Day Weather Outlook Friday 10/16: Showers are likely, with a 60% chance of precipitation and thunderstorms possible after 5 p.m. Temperatures could reach 81 degrees, with southwest winds of 5 to 10 mph and gusts up to 25 mph. Friday night brings an 80% precipitation chance and a low near 48 degrees.
Saturday 10/17: Partly sunny skies are expected with a high near 54 degrees, while north winds around 15 mph could gust to 30 mph. Mostly clear skies Saturday night will allow temperatures to fall near 37 degrees.
Sunday 10/18: Sunshine returns with an afternoon high near 57 degrees, offering a dry but cool day for outdoor activities. Mostly clear skies are expected Sunday night, with temperatures dropping to approximately 42 degrees.
Monday 10/19: Mostly sunny conditions and a high near 60 degrees will begin a gradual warming trend across Philadelphia. Monday night should be partly cloudy, with temperatures settling near 46 degrees.
Tuesday 10/20: Mostly sunny skies and a high near 66 degrees will bring milder afternoon conditions compared with the weekend. Tuesday night is expected to be mostly clear, with a low near 49 degrees.
Extended Weather Outlook Wednesday, Oct. 21, is expected to bring sunny skies and a high near 66 degrees, followed by mostly clear conditions and a low near 47 degrees.
Thursday, Oct. 22, should remain mostly sunny, with an afternoon high near 63 degrees.