April in Graz averages a daily high of 17.3°C with nights around 5.9°C. Expect roughly 9.7 wet days totalling 51.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Graz is April–September.
Based on GRAZ, AU (1.9km), 1995–2024. 28 years of April data.