May in Pittsburgh averages a daily high of 22.8°C with nights around 10.4°C. Expect roughly 12.4 wet days totalling 88.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Pittsburgh is May–June.
Based on EMSWORTH L D OHIO RIVER, PA US (10.6km), 1995–2024. 29 years of May data.