Typical Weather

Weather in Allentown in September

How warm is it in Allentown in September?

In September the typical daytime high in Allentown is 25.2 °C on average, from 27.8 °C at the start to 22.2 °C at the end of the month.

That is 3.8 °C cooler than in August and 6.1 °C warmer than in October.

The last 10 years were 1.7 °C warmer than more than 40 years ago.

Click a day for more: afternoon and night, the usual range, records and how fast it is warming.

The average of the weather stations Newark Liberty Intl Ap (112 km), Ny City Cntrl Park (130 km) and Carlisle Wtp (150 km); nearer ones count more.