National Weather Service Forecast for: Allentown PA
Issued by: National Weather Service Philadelphia, PA
Updated: 7:34 am EDT Mar 19, 2026
 
This
Afternoon
This Afternoon: Mostly cloudy, with a high near 50. South wind around 5 mph.
Mostly Cloudy

 Tonight

Tonight: Mostly cloudy, with a low around 32. South wind around 5 mph becoming calm.
Mostly Cloudy

 Friday

Friday: A chance of rain after 2pm. Partly sunny, with a high near 61. Light and variable wind becoming south 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Sunny
then Chance
Rain
 Friday
Night
Friday Night: Rain likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 45. South wind 5 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain Likely

 Saturday

Saturday: A chance of rain before 8am. Mostly sunny, with a high near 62. Northwest wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Chance Rain
then Mostly
Sunny
 Saturday
Night
Saturday Night: Mostly cloudy, with a low around 42.
Mostly Cloudy

 Sunday

Sunday: Partly sunny, with a high near 66.
Partly Sunny

 Sunday
Night
Sunday Night: Rain likely, mainly after 2am. Mostly cloudy, with a low around 40. Chance of precipitation is 60%.
Rain Likely

 Monday

Monday: Rain likely before 8am. Partly sunny, with a high near 50. Chance of precipitation is 60%.
Rain Likely
then Partly
Sunny
Hi 50 °F Lo 32 °F Hi 61 °F Lo 45 °F Hi 62 °F Lo 42 °F Hi 66 °F Lo 40 °F Hi 50 °F

 

This Afternoon
 
 Mostly cloudy, with a high near 50. South wind around 5 mph.
Tonight
 
 Mostly cloudy, with a low around 32. South wind around 5 mph becoming calm.
Friday
 
 A chance of rain after 2pm. Partly sunny, with a high near 61. Light and variable wind becoming south 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
 
 Rain likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 45. South wind 5 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
 
 A chance of rain before 8am. Mostly sunny, with a high near 62. Northwest wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
 
 Mostly cloudy, with a low around 42.
Sunday
 
 Partly sunny, with a high near 66.
Sunday Night
 
 Rain likely, mainly after 2am. Mostly cloudy, with a low around 40. Chance of precipitation is 60%.
Monday
 
 Rain likely before 8am. Partly sunny, with a high near 50. Chance of precipitation is 60%.
Monday Night
 
 Mostly clear, with a low around 25.
Tuesday
 
 Mostly sunny, with a high near 45.
Tuesday Night
 
 Mostly cloudy, with a low around 29.
Wednesday
 
 Mostly sunny, with a high near 50.

 

Forecast from NOAA-NWS for Allentown PA.