April in Ansan-si 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 Ansan-si is May–June.
Based on INCHEON, KS (23.1km), 1995–2024. 22 years of April data.