Hanoi · Vietnam · 1995–2024 averages
Hanoi weather, month by month. December is the pick.
Thirty years of averages for Hanoi, Vietnam — how hot it really feels, when the rain arrives, and what the air is like. December comes out on top; August is the one to skip.
The year at a glance
Tap a month for its full breakdown.
December
bestscore 73.8/100Mild, sticky and dryish, with poor air.
- Feels like
- 21°
- mild
- Real temp
- 21°
- mild
- Humidity
- 71%
- sticky
- Rain
- 31mm
- dryish
- Cloud cover
- 65%
- mixed
- Air quality
- 115
- poor
- Daylight
- 10.9h
- shortish
Month by month, metric by metric
Each strip covers the same twelve months, so you can see where the rain lands and how the air shifts with it.
Feels like
peaks at 39° in June
Real temp
20–33° in the shade across the year
Humidity
71% at its driest, 86% at its most oppressive
Rain
342mm in August, 31mm in December
Cloud cover
58% at its clearest, 88% at its greyest
Air quality
worst in April, cleanest in July
Daylight
10.9h to 13.4h of daylight across the year
Hanoi's air, month by month
The air is at its worst in April at 131 AQI (poor), and at its cleanest in July at 105 (poor). The dirtiest months here are also the driest.
Every month in full
All twelve months, all seven measures.
| Month | Feels like | Real temp | Humidity | Rain | Cloud cover | Air quality | Daylight |
|---|---|---|---|---|---|---|---|
| January | 20° cool | 20° cool | 76% sweaty | 42mm dryish | 77% grey | 113 poor | 11h shortish |
| February | 22° mild | 22° mild | 78% sweaty | 33mm dryish | 79% grey | 106 poor | 11.5h shortish |
| March | 27° mild | 25° mild | 80% sweaty | 58mm dryish | 79% grey | 121 poor | 12h even |
| April | 33° hot | 29° warm | 81% sweaty | 100mm some rain | 72% grey | 131 poor | 12.6h even |
| May | 37° scorching | 31° warm | 81% sweaty | 233mm soaking | 75% grey | 115 poor | 13.1h even |
| June | 39° scorching | 33° hot | 81% sweaty | 237mm soaking | 88% overcast | 112 poor | 13.4h even |
| July | 39° scorching | 32° warm | 82% sweaty | 273mm soaking | 84% grey | 105 poor | 13.3h even |
| August | 38° scorching | 31° warm | 86% soupy | 342mm soaking | 82% grey | 123 poor | 12.8h even |
| September | 36° hot | 30° warm | 84% sweaty | 266mm soaking | 72% grey | 111 poor | 12.3h even |
| October | 32° warm | 28° warm | 78% sweaty | 136mm rainy | 59% mixed | 108 poor | 11.7h shortish |
| November | 27° mild | 25° mild | 75% sweaty | 60mm dryish | 58% mixed | 116 poor | 11.1h shortish |
| December | 21° mild | 21° mild | 71% sticky | 31mm dryish | 65% mixed | 115 poor | 10.9h shortish |
Hanoi weather questions
- What is the best time to visit Hanoi?
- December scores best across temperature, rain, humidity and air quality — 21° feels-like, 31mm of rain and 71% humidity. August is the month to avoid: 342mm of rain and 123 AQI.
- How hot does Hanoi get?
- June is the peak, at 39° feels-like (33° in the shade) — scorching. Even in December it reaches 21°.
- When is the rainy season in Hanoi?
- August is the wettest month at 342mm, and December the driest at just 31mm.
- Is air quality a problem in Hanoi?
- April is the worst month at 131 AQI (poor), and July the best at 105 (poor).
Weather normals from Open-Meteo (ERA5 reanalysis, 1995–2024) and CAMS air quality (2015–2024), licensed CC-BY-4.0. Contains modified Copernicus Climate Change Service information. These are long-run averages, not forecasts — any given year will differ.
Going in December? You won't be the only one.
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