October in Zagreb averages a daily high of 17.2°C with nights around 9.7°C. Expect roughly 8.9 wet days totalling 82mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Zagreb is April–October.
Based on ZAGREB GRIC, HR (0.3km), 1995–2024. 29 years of October data.