May in Hietzing averages a daily high of 21.3°C with nights around 11.1°C. Expect roughly 12 wet days totalling 81mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Hietzing is May–September.
Based on WIEN, AU (6.5km), 1995–2024. 30 years of May data.