Con Dao Islands in August

November through April gives you the calmest seas and clearest skies. December and January are perfect — dry, breezy, and temperatures that hover around 26°C. The northeast monsoon from October through March brings choppy waters to north-facing beaches but makes the southern shores even more protected. Avoid May through September unless you're here for turtle season. The rains come hard and fast, flights get cancelled, and humidity makes everything stick to your skin. Vietnamese holidays like Tet in February turn the island into a domestic tourist magnet — book accommodations six months out or risk sleeping on the airport floor.