Hanoi Climate by Month – Rainy Season, Temperature Averages
Summary
The climate figures for Hanoi are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 2,203 mm.
The rainy season runs April–October. The wettest month is August with 432.9 mm across 25 rain days; the driest is December at just 33.8 mm.
The hottest month is June (average high 33.2°C) and the coolest is January (21°C).
The most comfortable time to visit Hanoi is December — less rain and milder heat.
Monthly averages · 2016–2025
| Monthly averages | High | Low | Rainfall | Rainy season |
|---|---|---|---|---|
| January | 21.0° | 14.2° | 62 mm | 11 |
| February | 22.1° | 15.2° | 51 mm | 10 |
| March | 25.6° | 18.7° | 71 mm | 13 |
| April | 29.0° | 21.6° | 103 mm | 13 |
| May | 31.3° | 24.6° | 225 mm | 18 |
| June | 33.2° | 26.5° | 281 mm | 19 |
| July | 32.8° | 26.3° | 329 mm | 22 |
| August | 31.7° | 25.8° | 433 mm | 25 |
| September | 30.8° | 24.8° | 352 mm | 21 |
| October | 28.3° | 22.0° | 203 mm | 14 |
| November | 25.9° | 18.9° | 59 mm | 8 |
| December | 21.7° | 14.8° | 34 mm | 7 |