May in Peterhof averages a daily high of 16.4°C with nights around 7.3°C. Expect roughly 10.5 wet days totalling 48.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Peterhof is May–August.
Based on ST. PETERSBURG, RS (24.1km), 1995–2024. 25 years of May data.