June in Allentown averages a daily high of 27.1°C with nights around 15.1°C. Expect roughly 11.4 wet days totalling 110.8mm. 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 June data.