FallPeak season ~78°F highs

Things to do in Allentown in September

September is one of the best months to visit Allentown, with average highs around 78°F. Crisp air and changing leaves make parks and viewpoints shine.

Plan a September weekend Where else in September

Best picks for September

What's famous here, weighted toward what shines in September.

1Foliage walks

Nockamixon State Park

State park in Pennsylvania, United States

Dorney Park

amusement park in Pennsylvania

3Foliage walks

Beltzville State Park

State park in Pennsylvania, United States

Holidays in September 2027

Labour Day · Mon, Sep 6

Expect busier roads and pricier stays around these dates. See long weekends.

Also great in September in Pennsylvania

Philadelphia Pittsburgh Lancaster Erie Scranton

Allentown in September: quick answers

Is September a good time to visit Allentown?

September is one of the best months to visit Allentown, with average highs around 78°F. Crisp air and changing leaves make parks and viewpoints shine.

What is the weather like in Allentown in September?

Average daytime highs are around 78°F, compared with 87°F in the warmest month. Check the forecast a week out; our planner favors indoor stops on rainy days.

What are the best things to do in Allentown in September?

Top picks for September: Nockamixon State Park, Dorney Park, Beltzville State Park, Jacobsburg Environmental Education Center, Locust Lake State Park.