Hue has an unusual climate for central Vietnam — the city sits in a natural bowl that catches rain from both the northeast and southwest monsoons, making it the wettest city in the country. The window of reliably dry weather is shorter than in nearby Da Nang.
February to April is the best time to visit. The rains have ended, the air is mild, and the countryside around the tombs is green from the wet season. The biennial Hue Festival (held in even-numbered years in late April) brings traditional music, dance, and royal court performances to the Citadel — plan around it if the dates coincide with your trip.
May to August is warm and occasionally hot, with low humidity and clear skies. Good weather for sightseeing, though the midday heat at the outdoor tombs can be draining.
October and November are the wet months. Heavy rain and occasional flooding are common; some years the old town and Citadel area flood entirely. If you visit during this period, bring waterproof bags for cameras and keep your schedule flexible.
December and January are cool, damp, and grey — the northeast monsoon brings persistent cloud cover and drizzle. Not comfortable for outdoor sightseeing, though the Citadel is atmospheric in the mist and tourist crowds are thin.