National Weather Service Forecast for: Allentown PA
Issued by: National Weather Service Philadelphia, PA
Updated: 4:28 pm EDT Jul 28, 2026
 
This
Afternoon
This Afternoon: Showers and possibly a thunderstorm. Some of the storms could be severe and produce heavy rainfall. High near 79. Southeast wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Severe
T-Storms

 Tonight

Tonight: Showers and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms, mainly between midnight and 2am. Some of the storms could be severe and produce heavy rainfall. Low around 65. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Severe
T-Storms
then Chance
T-storms
 Wednesday

Wednesday: A chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 80. Northwest wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Mostly Sunny
then Chance
Showers
 Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms before 4am, then a chance of showers after 5am. Mostly cloudy, with a low around 63. Northwest wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
Showers

 Thursday

Thursday: A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. North wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Partly Sunny
then Chance
T-storms
 Thursday
Night
Thursday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 62. Chance of precipitation is 30%.
Chance
T-storms then
Mostly Clear
 Friday

Friday: Mostly sunny, with a high near 85.
Mostly Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 64.
Mostly Clear

 Saturday

Saturday: Mostly sunny, with a high near 87.
Mostly Sunny
Hi 79 °F Lo 65 °F Hi 80 °F Lo 63 °F Hi 79 °F Lo 62 °F Hi 85 °F Lo 64 °F Hi 87 °F

Flood Watch
Severe Thunderstorm Watch
 

This Afternoon
 
 Showers and possibly a thunderstorm. Some of the storms could be severe and produce heavy rainfall. High near 79. Southeast wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
 
 Showers and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms, mainly between midnight and 2am. Some of the storms could be severe and produce heavy rainfall. Low around 65. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Wednesday
 
 A chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 80. Northwest wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
 A chance of showers and thunderstorms before 4am, then a chance of showers after 5am. Mostly cloudy, with a low around 63. Northwest wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
 
 A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. North wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
 
 A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 62. Chance of precipitation is 30%.
Friday
 
 Mostly sunny, with a high near 85.
Friday Night
 
 Mostly clear, with a low around 64.
Saturday
 
 Mostly sunny, with a high near 87.
Saturday Night
 
 Mostly cloudy, with a low around 66.
Sunday
 
 A chance of showers. Mostly cloudy, with a high near 84. Chance of precipitation is 50%.
Sunday Night
 
 A chance of showers. Mostly cloudy, with a low around 67. Chance of precipitation is 50%.
Monday
 
 A chance of showers. Mostly cloudy, with a high near 84. Chance of precipitation is 50%.
Monday Night
 
 A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Tuesday
 
 A chance of showers. Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Allentown PA.