October in Allentown averages a daily high of 18.4°C with nights around 6.5°C. Expect roughly 10.1 wet days totalling 104.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Allentown is May–June.
Based on ALLENTOWN LEHIGH VALLEY INTERNATIONAL AIRPORT, PA US (5.8km), 1995–2024. 30 years of October data.