September in Zemun averages a daily high of 24.4°C with nights around 14.2°C. Expect roughly 8.7 wet days totalling 61.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Zemun is May–June.
Based on BELGRADE OBSERVATORY, RI (7.3km), 1995–2024. 30 years of September data.