September in Niš averages a daily high of 25.2°C with nights around 12.1°C. Expect roughly 9.1 wet days totalling 52.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Niš is April–June.
Based on NIS, RI (1km), 1995–2024. 29 years of September data.