18017 Weather (Allentown, PA)

Weather forecast for: Allentown PA

Last Update: 4:54 pm EDT Sep 1, 2026

Tonight: Increasing clouds, with a low around 69. Calm wind.

Wednesday: A chance of showers and thunderstorms, mainly between 3pm and 4pm. Mostly cloudy, with a high near 76. East wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: A chance of showers and thunderstorms before 11pm, then showers likely and possibly a thunderstorm between 11pm and 5am, then a chance of showers and thunderstorms after 5am. Cloudy, with a low around 68. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: Showers and thunderstorms likely before 2pm, then a chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 87. Light southwest wind becoming west 5 to 10 mph in the afternoon. Chance of precipitation is 60%. 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 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 70. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 84. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night: A chance of showers before 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 30%.

Saturday: Sunny, with a high near 79.

Saturday Night: Mostly clear, with a low around 59.

Sunday: Sunny, with a high near 77.

Sunday Night: Mostly clear, with a low around 57.

Labor Day: Mostly sunny, with a high near 79.

Monday Night: Partly cloudy, with a low around 58.

Tuesday: Mostly sunny, with a high near 78.