Bethlehem Weather Forecast

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Last Updated: January 2, 2026

Bethlehem, Pennsylvania has a humid continental climate with hot summers and cold winters.


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Summary

The city is situated in the Lehigh River watershed and is home to the Monocacy Creek, which flows through the city's historic district. Despite being an urban area, Bethlehem boasts several outdoor recreation opportunities, including hiking and biking trails along the Lehigh Canal and Monocacy Way, fishing in the Lehigh River, and skiing and snowboarding at nearby Blue Mountain Resort. The city also has several parks, including the popular SteelStacks, which hosts outdoor concerts and events throughout the year. Bethlehem's hydrology constituents include the Lehigh River, Monocacy Creek, and the Bethlehem Municipal Water Authority, which provides drinking water to the city and surrounding areas.

       

Weather Forecast

Bethlehem receives approximately 1198mm of rain per year, with humidity levels near 79% and air temperatures averaging around 11°C. Bethlehem 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.