October in Harrisburg averages a daily high of 17.6°C with nights around 6.9°C. Expect roughly 10.7 wet days totalling 96.9mm. 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. 26 years of October data.