Allentown Weather Forecast

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Last Updated: January 2, 2026

Allentown, Pennsylvania is located in the northeastern region of the United States and experiences a humid continental climate with hot summers and cold winters.


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Summary

The area is susceptible to heavy rainfall and occasional flooding due to its location near the Lehigh River. Hydrology constituents such as sediment and nutrients can pose a threat to water quality in the river. Outdoor recreation opportunities in Allentown include hiking and biking trails, parks, and fishing in the Lehigh River. The Lehigh Valley Zoo and Dorney Park & Wildwater Kingdom offer family-friendly entertainment options.

       

Weather Forecast

Allentown receives approximately 1178mm of rain per year, with humidity levels near 79% and air temperatures averaging around 11°C. Allentown has a plant hardyness factor of 6, meaning plants and agriculture in this region thrive during a short period during spring and early summer. Most plants will die off during the colder winter months.