April in Lancaster averages a daily high of 17.8°C with nights around 5°C. Expect roughly 11.2 wet days totalling 91.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Lancaster is May–June.
Based on LANCASTER 2 NE FILT PLANT, PA US (3km), 1995–2024. 30 years of April data.