National Weather Service Forecast for: Allentown PA
Issued by: National Weather Service Philadelphia, PA
Updated: 4:12 pm EST Dec 22, 2025
 
Tonight

Tonight: Snow likely, mainly after 4am. Mostly cloudy, with a low around 29. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.
Mostly Cloudy
then Snow
Likely
 Tuesday

Tuesday: Snow before 11am, then rain and snow likely between 11am and noon, then a chance of rain after noon. High near 41. Southeast wind around 5 mph becoming west in the afternoon. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Rain/Snow
then Chance
Rain
 Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 34. West wind 5 to 15 mph, with gusts as high as 25 mph.
Mostly Cloudy

 Wednesday

Wednesday: Sunny, with a high near 43. Northwest wind 5 to 15 mph, with gusts as high as 30 mph.
Sunny

 Wednesday
Night
Wednesday Night: Mostly cloudy, with a low around 27. Calm wind.
Mostly Cloudy

 Christmas
Day
Christmas Day: Mostly cloudy, with a high near 42.
Mostly Cloudy

 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 29.
Mostly Cloudy

 Friday

Friday: A chance of rain and snow before 1pm, then rain, snow, and freezing rain. High near 34. Chance of precipitation is 90%.
Chance
Rain/Snow
then Wintry
Mix
 Friday
Night
Friday Night: Rain, snow, and freezing rain before 1am, then a chance of snow and freezing rain. Low around 28. Chance of precipitation is 80%.
Wintry Mix
Lo 29 °F Hi 41 °F Lo 34 °F Hi 43 °F Lo 27 °F Hi 42 °F Lo 29 °F Hi 34 °F Lo 28 °F

 

Tonight
 
 Snow likely, mainly after 4am. Mostly cloudy, with a low around 29. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.
Tuesday
 
 Snow before 11am, then rain and snow likely between 11am and noon, then a chance of rain after noon. High near 41. Southeast wind around 5 mph becoming west in the afternoon. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Tuesday Night
 
 Mostly cloudy, with a low around 34. West wind 5 to 15 mph, with gusts as high as 25 mph.
Wednesday
 
 Sunny, with a high near 43. Northwest wind 5 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 29.
Friday
 
 A chance of rain and snow before 1pm, then rain, snow, and freezing rain. High near 34. Chance of precipitation is 90%.
Friday Night
 
 Rain, snow, and freezing rain before 1am, then a chance of snow and freezing rain. Low around 28. Chance of precipitation is 80%.
Saturday
 
 A chance of rain or freezing rain before 1pm, then a chance of rain. Cloudy, with a high near 37. Chance of precipitation is 30%.
Saturday Night
 
 A chance of rain. Cloudy, with a low around 31. Chance of precipitation is 40%.
Sunday
 
 Rain likely. Cloudy, with a high near 44. Chance of precipitation is 60%.
Sunday Night
 
 A chance of rain. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
Monday
 
 Sunny, with a high near 31.

 

Forecast from NOAA-NWS for Allentown PA.