August in Lancaster averages a daily high of 29.3°C with nights around 17.7°C. Expect roughly 9.7 wet days totalling 94.2mm. 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 August data.