August in Zagreb averages a daily high of 28.1°C with nights around 18.3°C. Expect roughly 8.4 wet days totalling 83.4mm. 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. 29 years of August data.