September in Gimpo-si averages a daily high of 26.1°C with nights around 17.4°C. Expect roughly 8.8 wet days totalling 131.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Gimpo-si is May–June.
Based on INCHEON, KS (18.8km), 1995–2024. 22 years of September data.