September in Iaşi averages a daily high of 23.2°C with nights around 11.1°C. Expect roughly 7.6 wet days totalling 51.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Iaşi is May–June.
Based on IASI, RO (2.5km), 1995–2024. 30 years of September data.