Hottest and Coldest Temperatures Ever in Allentown on September 21

On September 21st in Allentown, the temperature ranged from a scorching 89.1°F in 1965 to a chilly 33.1°F in 2020. The average temperature for this date stands at 64.51°F, with an average high temperature of 69.47°F and an average low temperature of 59.55°F. In 1965, while experiencing the hottest temperature, an interesting news item worth mentioning is that the Beatles released their album "Help!" which topped the charts and solidified their popularity even further.