August in Harrisburg averages a daily high of 28.6°C with nights around 17.5°C. Expect roughly 10.7 wet days totalling 115.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Harrisburg is May–June.
Based on HARRISBURG 1 NE, PA US (1.5km), 1995–2024. 27 years of August data.