May in Incheon averages a daily high of 21.8°C with nights around 12.3°C. Expect roughly 7.6 wet days totalling 112.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Incheon is May–June.
Based on INCHEON, KS (6.5km), 1995–2024. 20 years of May data.