Weather
New Jersey Frost Alert Tonight: Lows Near 31 by Monday Oct 19
Mount Holly, NJ – Residents across northern and interior New Jersey are facing another cold night as temperatures could fall to near freezing late Sunday into early Monday, bringing the potential for
By Rachel Monroe · 2026-10-18T12:05:42.143Z
Mount Holly, NJ – Residents across northern and interior New Jersey are facing another cold night as temperatures could fall to near freezing late Sunday into early Monday, bringing the potential for frost and freeze conditions in several communities.
According to the National Weather Service in Mount Holly, mostly sunny skies and seasonably chilly temperatures are expected Sunday, October 18, before clear skies allow temperatures to drop sharply overnight into Monday, October 19.
Northern New Jersey Could Reach Freezing The latest forecast shows some of the coldest temperatures developing across northern New Jersey and portions of eastern Pennsylvania.
Sussex, New Jersey, is forecast to fall to approximately 31 degrees overnight, while Morristown could reach 35 degrees and Flemington 35 degrees.
Across the Delaware River, Allentown, Pennsylvania, is expected to reach 32 degrees, while Mount Pocono could fall to 33 degrees.
Reading, Pennsylvania, is forecast to drop to approximately 33 degrees.
These temperatures could support frost formation, particularly in sheltered and low lying locations.
Philadelphia and Coastal Communities Stay Warmer Conditions will be somewhat milder closer to Philadelphia and the Atlantic coastline.
Philadelphia is forecast to reach approximately 38 degrees overnight, while Trenton could fall to 36 degrees.
Farther south, Atlantic City is expected to remain near 50 degrees, with Cape May around 49 degrees.
Long Branch could see temperatures near 46 degrees, highlighting the significant temperature differences between inland and coastal communities.
Residents Urged to Prepare for Cold Overnight Conditions Sunday afternoon temperatures will generally range from the mid 50s to around 60 degrees across the region.
Despite the sunshine, the National Weather Service warns that frost and freezing conditions are possible in portions of its forecast area Sunday night through Monday morning.
Residents with sensitive outdoor plants should consider protective measures, especially in northern and interior communities.
Motorists traveling through rural valleys early Monday should remain mindful of potentially colder local conditions.