Weather
Pennsylvania-Delaware Frost Advisory: Lows Near 33° Threaten Plants Oct 25
Philadelphia, PA – A cold start to Sunday is bringing a frost threat across southeastern Pennsylvania, Delaware and portions of northeastern Maryland, where temperatures could fall as low as 33 degree
By Lauren Beckett · 2026-10-25T08:20:09.812Z
Philadelphia, PA – A cold start to Sunday is bringing a frost threat across southeastern Pennsylvania, Delaware and portions of northeastern Maryland, where temperatures could fall as low as 33 degrees before sunrise. The National Weather Service has maintained a Frost Advisory through 9 a.m. EDT Sunday, warning that sensitive outdoor vegetation could suffer damage or die if left unprotected. The early morning chill comes ahead of a significant daytime warmup, with Philadelphia expected to reach 67 degrees Sunday and 70 degrees Monday.
According to the National Weather Service in Mount Holly, New Jersey, the advisory covers portions of central, northern and southern Delaware, northeastern Maryland and southeastern Pennsylvania. Communities including Philadelphia, Wilmington, Dover, West Chester, Norristown, Doylestown and Chestertown are among the locations identified in the alert. The advisory was updated at 3:25 a.m. Sunday and specifically warns residents to protect tender outdoor plants from potentially damaging frost.
Frost Advisory Covers Multiple States Temperatures near 33 degrees can allow frost to form on exposed surfaces, particularly in sheltered locations where colder air collects near the ground. While the advisory does not indicate widespread freezing temperatures below 32 degrees, frost can still damage sensitive vegetation. Gardeners with late season flowers, vegetables and other vulnerable plants should take protective measures before the advisory expires.
The cold conditions are expected to be relatively short lived. Philadelphia's official point forecast calls for patchy frost before 9 a.m., followed by sunny skies and a high near 67 degrees. Calm winds should accompany the afternoon warmup, creating a substantial contrast between the chilly early morning and the more comfortable temperatures expected later in the day.
Warmer Weather Returns Across Philadelphia Monday, Oct. 26, brings another noticeable improvement as temperatures climb to approximately 70 degrees. Mostly cloudy skies during the morning should gradually clear, allowing sunshine to develop across Philadelphia and nearby communities. Winds remain relatively light, becoming westerly around 5 mph during the afternoon, while Monday night temperatures settle near 49 degrees.
The warmer daytime conditions should provide relief for residents concerned about the early frost threat. However, the temperature difference between Sunday morning's regional frost potential and Monday afternoon's expected warmth illustrates how quickly late October conditions can change. Residents traveling along Interstate 95, Interstate 76 and other major Philadelphia area roads should encounter generally favorable weather after the early morning cold, with no significant precipitation indicated in the supplied local forecast.
Midweek Cooldown Before Temperatures Reach the 70s Tuesday brings another sunny afternoon, although temperatures are expected to ease to approximately 66 degrees as north winds develop around 5 mph. Tuesday night becomes mostly clear, with lows near 44 degrees. Wednesday, Oct. 28, continues the cooler trend, with mostly sunny skies and a high near 65 degrees before temperatures fall to approximately 47 degrees Wednesday night.
By Thursday, temperatures are expected to rebound to around 70 degrees under mostly sunny skies. The warming trend continues Friday, when Philadelphia could reach 74 degrees, making it the warmest day in the supplied forecast period. Saturday's outlook also remains favorable, with mostly sunny conditions and a high near 72 degrees.
For residents across southeastern Pennsylvania and neighboring Delaware and Maryland, Sunday's frost threat is the immediate concern before a stretch of generally pleasant autumn weather takes hold. Gardeners should continue monitoring nighttime temperatures as the season progresses, even when daytime readings climb well into the 60s and 70s.
Have you already moved your outdoor plants indoors, or are you still keeping your garden growing through late October?
Five Day Weather Outlook Sunday 10/25: Patchy frost is possible before 9 a.m., with temperatures in affected areas potentially reaching 33 degrees. Philadelphia should become sunny with a high near 67 degrees before mostly clear skies and a low around 41 degrees tonight.
Monday 10/26: Mostly cloudy skies during the morning gradually give way to sunshine, with temperatures reaching approximately 70 degrees. Light winds become westerly around 5 mph during the afternoon, followed by clear skies and a low near 49 degrees.
Tuesday 10/27: Sunny skies return with an afternoon high near 66 degrees and north winds around 5 mph. Mostly clear conditions continue Tuesday night as temperatures drop to approximately 44 degrees across Philadelphia.
Wednesday 10/28: Mostly sunny conditions are expected with temperatures reaching approximately 65 degrees. Wednesday night becomes mostly cloudy, with temperatures falling to around 47 degrees as the cooler midweek weather pattern continues.
Thursday 10/29: Mostly sunny skies accompany a warming trend, with afternoon temperatures climbing to approximately 70 degrees. Mostly clear conditions follow Thursday night, with temperatures settling around 51 degrees ahead of a warmer Friday.
Extended Weather Outlook Friday, Oct. 30, is expected to bring sunshine and an afternoon high near 74 degrees, followed by mostly clear skies and an overnight low around 52 degrees.
Saturday, Oct. 31, should remain mostly sunny, with temperatures reaching approximately 72 degrees during the afternoon.
The supplied National Weather Service outlook does not extend far enough to establish reliable conditions for the full six to 10 day period.