September in Dalian averages a daily high of 24.3°C with nights around 18.1°C. Expect roughly 5.1 wet days totalling 67.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Dalian is May–June.
Based on DALIAN, CH (3km), 1995–2024. 18 years of September data.