QUICK FACTS
Best months: October to December, March to April
Peak season: October to November
Festival highlight: Tet, Vietnamese Lunar New Year
Avoid: January to February cold drizzle, June to August heat and rain
OCTOBER TO DECEMBER — THE FINEST WINDOW
Autumn is widely considered Hanoi’s best season: warm, dry, comfortable temperatures around 20 to 28 degrees, with the punishing summer humidity gone and the cold winter drizzle not yet arrived. This is the season locals themselves most associate with the city’s charm, when the lakes and tree-lined boulevards are at their most pleasant for walking.
MARCH TO APRIL — SPRING
A second good window, similarly comfortable temperatures to autumn, with the added appeal of spring blossoms in the city’s parks. Slightly more rainfall than autumn but generally manageable.
JANUARY TO FEBRUARY — COLD AND DAMP
Hanoi’s winter brings genuinely uncomfortable conditions for a tropical-adjacent city — persistent cold drizzle, overcast skies and temperatures that, while not extreme by global standards, feel penetrating given the dampness and lack of indoor heating in much of the older city. Tet, the Lunar New Year, typically falls in this window and is Vietnam’s most significant holiday, during which much of the city’s commercial life pauses for several days as families travel and celebrate — worth experiencing for the cultural significance but requiring awareness that many businesses close.
MAY TO SEPTEMBER — HOT AND WET
Summer brings intense heat, high humidity and the bulk of the year’s rainfall, including occasional typhoon-related severe weather. Not the ideal season for extensive walking-based sightseeing, though the city continues to function normally throughout.
FESTIVALS AND EVENTS
Tet (January or February, dates follow the lunar calendar): Vietnam’s most important holiday, comparable in cultural weight to Christmas and New Year combined in Western countries. Streets fill with kumquat trees and peach blossoms, a traditional Tet decoration, in the weeks before. Mid-Autumn Festival (September or October): a significant celebration particularly for children, with mooncakes and lantern parades through the Old Quarter.