September in Helong averages a daily high of 22.8°C with nights around 9.8°C. Expect roughly 7.3 wet days totalling 58.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Helong is May.
Based on YANJI, CH (54.9km), 1995–2024. 23 years of September data.