May in Zagreb averages a daily high of 22.8°C with nights around 13.1°C. Expect roughly 12.7 wet days totalling 83.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Zagreb is April–October.
Based on ZAGREB GRIC, HR (0.3km), 1995–2024. 28 years of May data.