March in Harrisburg averages a daily high of 9.7°C with nights around -0.7°C. Expect roughly 9.6 wet days totalling 85.8mm. Demanding conditions — pack for it and plan indoor options.
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 March data.