April in Incheon averages a daily high of 16.4°C with nights around 7.4°C. Expect roughly 5.8 wet days totalling 68.4mm. 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. 22 years of April data.