September in Graz averages a daily high of 21.2°C with nights around 11.2°C. Expect roughly 10.5 wet days totalling 92.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Graz is April–September.
Based on GRAZ, AU (1.9km), 1995–2024. 28 years of September data.