NWS Forecast for Allentown PA

National Weather Service Forecast for: Allentown PA
Issued by: National Weather Service Philadelphia, PA

Updated: 1:45 am EST Dec 23, 2025

Overnight Chance Snow	Tuesday Snow then Slight Chance Rain	Tuesday Night Decreasing Clouds	Wednesday Sunny	Wednesday Night Mostly Cloudy	Christmas Day Mostly Cloudy	Thursday Night Mostly Cloudy	Friday Chance Snow then Snow	Friday Night Wintry Mix
Lo 30 °F	Hi 38 °F	Lo 34 °F	Hi 42 °F	Lo 27 °F	Hi 42 °F	Lo 24 °F	Hi 31 °F	Lo 25 °F

Winter Weather Advisory

Overnight	A chance of snow. Cloudy, with a low around 30. Calm wind. Chance of precipitation is 40%. Little or no snow accumulation expected.
Tuesday	Rain and snow before 3pm, then a slight chance of rain between 3pm and 4pm. High near 38. Southeast wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Tuesday Night	Mostly cloudy, then gradually becoming mostly clear, with a low around 34. West wind 5 to 15 mph.
Wednesday	Sunny, with a high near 42. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Wednesday Night	Mostly cloudy, with a low around 27. Calm wind.
Christmas Day	Mostly cloudy, with a high near 42.
Thursday Night	Mostly cloudy, with a low around 24.
Friday	Snow, mainly after 1pm. High near 31. Chance of precipitation is 80%.
Friday Night	Snow and freezing rain. Low around 25. Chance of precipitation is 90%.
Saturday	A chance of rain or freezing rain before 1pm, then a chance of rain. Cloudy, with a high near 36. Chance of precipitation is 30%.
Saturday Night	A chance of rain and snow. Cloudy, with a low around 32. Chance of precipitation is 50%.
Sunday	Rain likely. Cloudy, with a high near 43. Chance of precipitation is 70%.
Sunday Night	A chance of rain. Mostly cloudy, with a low around 21. Chance of precipitation is 40%.
Monday	Partly sunny, with a high near 29.

Forecast from NOAA-NWS for Allentown PA.