May in Đồng Hới averages a daily high of 32.3°C with nights around 26°C. Expect roughly 8 wet days totalling 108.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Đồng Hới is January–April.
Based on DONG HOI, VM (2.8km), 1995–2024. 23 years of May data.