Climate Overview
Hanoi has a humid-subtropical climate with hot, soaking summers peaking at 35°C and 413mm of rain in Aug, and cool 21–23°C winters that feel damp from constant 72–78% humidity. Oct–Nov and Mar–Apr are the best windows — dry enough to walk the Old Quarter, mild enough for Halong Bay trips.
Monthly Climate
Temperature range, rainfall, and humidity by month
Monthly Data
| Month | High | Low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 22.6° | 14.3° | 8mm | 65% |
| Feb | 19.7° | 15.6° | 41mm | 82% |
| Mar | 24.6° | 18.5° | 20mm | 77% |
| Apr | 29.2° | 22.3° | 45mm | 77% |
| May | 31.8° | 24.5° | 272mm | 83% |
| Jun | 34° | 26.5° | 300mm | 84% |
| Jul | 33.9° | 26.4° | 343mm | 85% |
| Aug | 33.2° | 26° | 482mm | 85% |
| Sep | 33.2° | 25.9° | 429mm | 84% |
| Oct | 29.9° | 23.6° | 320mm | 81% |
| Nov | 24.9° | 17.8° | 119mm | 77% |
| Dec | 24.3° | 18.4° | 17mm | 80% |
When to Visit
Experiences to seek out and peak periods to plan around
Experiences & Highlights
The driest, most comfortable stretch (22–30°C highs, rainfall drops from 170mm to 22mm) — ideal for walking Hoan Kiem Lake at dawn and bia hoi crawls on Ta Hien Street.
Vietnam's biggest holiday: peach blossoms on Nhat Tan flower market, kumquat trees on every xe máy, and family closures across the Old Quarter. Cool 21°C highs suit temple visits at Ngoc Son and Quan Thanh.
Hang Ma street fills with paper lanterns, star-shaped lights and mooncakes from Bao Phuong; lion-dance troupes tour the Old Quarter the weekend of the 15th lunar-month full moon.
Independence Day on 2 September brings flag displays around Ba Dinh Square and evening fireworks at Hoan Kiem Lake — still inside the rainy season so pack a poncho.
Peak Periods & Travel Advisories
Monthly rainfall climbs from 219mm to a 413mm peak in August with humidity at 84–86%; afternoon thunderstorms flood Old Quarter sois and Ha Long day-trips get cancelled for typhoons.
Most restaurants, shops and family-run hotels close for 5–7 days around Lunar New Year; domestic flights and trains sell out 6+ weeks ahead and prices spike.
Hanoi's best weather draws international crowds: Temple of Literature queues lengthen, Old Quarter hotel rates rise 30–50%, and Sapa / Ha Giang tours book 1–2 months out.
Vietnam Destination Comparison
Compare climate across destinations in Vietnam
| City | Avg High | Avg Low | Annual Rain | Season Overview |
|---|---|---|---|---|
🇻🇳 Hanoi | 28° | 22° | 2396 mm | |
🇻🇳 Ho Chi Minh City | 33° | 25° | 2243 mm |
Official Resources
Government portals and tourism boards for Hanoi, Vietnam