Weather
Pennsylvania Frost: Lows Could Reach Upper 30s Monday
Philadelphia, PA – Eastern Pennsylvania is moving toward its first frost season, with colder nights arriving this week and some inland communities potentially falling into the upper 30s.
By Natalie Rhodes · 2026-10-04T13:27:49.506Z
Philadelphia, PA – Eastern Pennsylvania is moving toward its first frost season, with colder nights arriving this week and some inland communities potentially falling into the upper 30s.
According to the National Weather Service in Philadelphia/Mount Holly, Sunday’s rain will diminish during the evening before a stretch of mostly dry weather takes hold. Monday will be mild and breezy, followed by a much cooler Tuesday.
The colder nights come as Pennsylvania moves deeper into the October period when frost becomes an increasing concern. The timing varies considerably across the state, with colder inland and higher elevation communities typically reaching frost producing temperatures before the Philadelphia urban area and immediate coast.
No Frost Advisory or Freeze Warning is indicated in the forecast provided. However, Monday night lows across the broader NWS forecast area are expected to range from 38 to 50 degrees, putting the coldest locations close to temperatures where frost can become possible.
Sunday remains cloudy with rain showers and highs ranging from 57 to 68. Rain chances are 40% to 80% during the day before dropping to 10% to 20% Sunday night.
Monday brings decreasing clouds, breezy conditions and highs of 60 to 71 degrees.
Tuesday will be the coolest day of the five day outlook, with sunshine and highs of only 57 to 64. Tuesday night lows should range from 40 to 52.
Temperatures then moderate, with Wednesday highs of 63 to 70 and Thursday reaching 66 to 74.
For eastern Pennsylvania, the week ahead brings the kind of colder nights that increasingly warrant attention from gardeners, but no widespread frost is currently forecast. After Sunday’s rain, mostly sunny and dry conditions should dominate through Thursday.