April in Harrisburg averages a daily high of 16.6°C with nights around 4.9°C. Expect roughly 11.6 wet days totalling 97.4mm. 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. 25 years of April data.