Climate in Hanoi — Annual Weather Overview
Hanoi has a subtropical climate — hot summers, mild winters, rainfall spread throughout the year. The hottest month is June (average high 33.7°C) and the coolest is December (21.3°C). There is a noticeable seasonal temperature shift of 12.4°C between June and December. Annual rainfall totals around 2052mm. August is the wettest month at 399.9mm, while December averages just 15.5mm. Average daily sunshine is 6.9 hours.
**Spring (March, April, May):** average highs 28.7°C, 379mm rain. **Summer (June, July, August):** average highs 33.0°C, 834mm rain. **Autumn (September, October, November):** average highs 28.3°C, 694mm rain. **Winter (December, January, February):** average highs 21.7°C, 145mm rain.
Hanoi — Monthly Temperatures
Hanoi — Monthly Rainfall
✅ Best months to visit
All year
ℹ️ No months to avoid
Weather in Hanoi stays reasonable all year.
Hanoi weather by month
| Month | High | Low | Rain | Sun/day | Rainy days | Rating |
|---|---|---|---|---|---|---|
| January | 21.4°C | 14.0°C | 47.0mm | 4.9h | 10 | 10/10 |
| February | 22.4°C | 15.5°C | 82.4mm | 4.2h | 12 | 10/10 |
| March | 26.4°C | 19.5°C | 95.2mm | 3.7h | 13 | 10/10 |
| April | 27.8°C | 20.9°C | 102.2mm | 5.4h | 14 | 9/10 |
| May | 32.0°C | 24.8°C | 181.6mm | 8.6h | 15 | 9/10 |
| June | 33.7°C | 26.8°C | 223.2mm | 9.1h | 16 | 8/10 |
| July | 33.5°C | 26.8°C | 211.0mm | 10.0h | 18 | 8/10 |
| August | 31.8°C | 25.9°C | 399.9mm | 8.3h | 24 | 8/10 |
| September | 30.7°C | 25.0°C | 384.7mm | 7.6h | 23 | 8/10 |
| October | 27.7°C | 21.5°C | 250.0mm | 7.1h | 13 | 8/10 |
| November | 26.6°C | 19.4°C | 59.7mm | 7.8h | 8 | 10/10 |
| December | 21.3°C | 14.1°C | 15.5mm | 5.8h | 4 | 10/10 |
For the full verdict on when to go, see the best time to visit Hanoi and the Hanoi rainy season guide. Seasonal breakdowns: spring, summer, autumn and winter.
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Frequently Asked Questions
What type of climate does Hanoi have?
Hanoi has a subtropical climate — hot summers, mild winters, rainfall spread throughout the year. Average highs range from 21.3°C in December to 33.7°C in June.
What is the hottest month in Hanoi?
June is the hottest month in Hanoi, with average highs of 33.7°C and lows of 26.8°C.
What is the coldest month in Hanoi?
December is the coolest month, with average highs of 21.3°C and lows of 14.0°C.
What is the wettest month in Hanoi?
August is the wettest month, averaging 399.9mm of rainfall over around 24 rainy days.
When is rainy season in Hanoi?
Rainy season in Hanoi runs April to October, when rainfall is significantly higher than the rest of the year. Full rainy season guide →
How much rain does Hanoi get per year?
Hanoi receives around 2052mm of rain per year. The driest month is December (15.5mm).
When is the best time to visit Hanoi?
The best time to visit Hanoi is All year. See the full month-by-month guide →
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For the packing side of things, our sister site has a ready-made checklist: Hanoi packing list at 247PackingList. For currency, language and country facts see the Vietnam guide at 247CountryInfo. Some travellers fund a longer stay in Hanoi by teaching English along the way — a TEFL certificate is usually all it takes.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.