Destination guide
Hanoi weather by month
November is the best all-round choice for Hanoi, with October and March also worth considering. November's daytime average of 25°C suits time outdoors without the stronger summer heat, while October is warmer at 28°C. March offers comfortable temperatures too, but less sunshine. The main trade-off is between the cooler, less rainy winter months and the hotter, wetter summer. Choose autumn for the strongest balance, or winter if avoiding heat matters more than warmth.
- Hottest month
- 32.6°CJune
- Coolest month
- 19.7°CJanuary
- Rain per year
- 1729mmaverage total
- Flight from London
- 12 h 18 minLong-haul (7 h+) · estimated
Hanoi, month by month
Month-by-month detail pages exist for our most searched destinations; for Hanoi the 12-month table below carries the full picture.
A little perspective
Hanoi through the year
Every month at a glance; "best" marks our three top months on warmth, dryness and sunshine.
| Month | Day | Night | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|
| January | 19.7°C | 13.6°C | 2.4 | 41 | 8 | 12% |
| February | 21.8°C | 15.3°C | 2.3 | 28 | 7 | 32% |
| Marchbest | 24.9°C | 18.2°C | 2.4 | 56 | 10 | 51% |
| April | 28.8°C | 21.6°C | 3.4 | 100 | 11 | 82% |
| May | 31.1°C | 24.3°C | 3.1 | 233 | 18 | 96% |
| June | 32.6°C | 26.0°C | 1.6 | 227 | 19 | 100% |
| July | 32.3°C | 26.0°C | 1.9 | 266 | 21 | 100% |
| August | 31.4°C | 25.4°C | 2.3 | 320 | 23 | 100% |
| September | 30.3°C | 24.1°C | 3.5 | 243 | 19 | 98% |
| Octoberbest | 28.3°C | 21.6°C | 4.9 | 121 | 12 | 88% |
| Novemberbest | 25.0°C | 18.0°C | 4.6 | 59 | 8 | 57% |
| December | 21.0°C | 14.2°C | 3.8 | 35 | 7 | 15% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
Best months here
On warmth, low rainfall and sunshine, start with these.
When to go to Hanoi
For beach weather, look at months where the daytime average clears 25°C and rainy days stay low: April, May, June, July, August, September, October, November. August is the wettest month (320 mm, about 23 rainy days) and February the driest (28 mm).
Getting there
A direct flight from London Gatwick to Noi Bai International Airport (HAN, 22 km from Hanoi) takes roughly 12 h 18 min - long-haul (7 h+) by UK standards. Time-zone: Asia/Bangkok.
Records and extremes, 1991-2020
The hottest day recorded in Hanoi between 1991 and 2020 reached 38.9°C on 3 May 1994; the coldest fell to 3.8°C on 23 December 1999. In June one day in ten tops 35.6°C and about 87% of days pass 30°C; in January one night in ten drops to 9.2°C or below. The wettest single month of the period was September 2020 with 590 mm, against a September average of 243 mm.
Sunrise, sunset and daylight in Hanoi
Local time on the 15th of each month; daylight-saving rules as of 2020.
| Month (15th) | Sunrise | Sunset | Daylight | Sunshine/day |
|---|---|---|---|---|
| January | 06:36 | 17:35 | 11.0 h | 2.4 h |
| February | 06:27 | 17:54 | 11.4 h | 2.3 h |
| March | 06:05 | 18:06 | 12.0 h | 2.4 h |
| April | 05:38 | 18:16 | 12.6 h | 3.4 h |
| May | 05:19 | 18:27 | 13.1 h | 3.1 h |
| June | 05:15 | 18:39 | 13.4 h | 1.6 h |
| July | 05:24 | 18:41 | 13.3 h | 1.9 h |
| August | 05:35 | 18:27 | 12.9 h | 2.3 h |
| September | 05:44 | 18:00 | 12.3 h | 3.5 h |
| October | 05:52 | 17:33 | 11.7 h | 4.9 h |
| November | 06:07 | 17:15 | 11.1 h | 4.6 h |
| December | 06:26 | 17:18 | 10.9 h | 3.8 h |
December to April: cool starts, then warmer days
December through February suits travellers who prefer cooler weather and fewer rain days, but do not expect consistently warm evenings. December averages 21°C by day; January slips to 20°C, with both months averaging 14°C at night, so pack a jumper or light jacket. February edges up to 22°C and is the driest month, though its 2 hours of daily sunshine make it a less obvious choice for sunshine seekers. March is a better compromise for comfortable warmth: days reach 25°C and nights 18°C, but sunshine remains limited and rain becomes more frequent. April brings a clearer shift towards heat, averaging 29°C by day and 22°C at night. Lighter clothes become more useful, with a waterproof layer still sensible.
May to September: heat with frequent rain
May marks the move into Hanoi's hotter, wetter stretch, with daytime averages of 31°C and 18 rain days. June is the hottest month, averaging 33°C by day, while nights stay warm at 26°C in both June and July. Plan outdoor time towards the cooler parts of the day and leave room for indoor breaks around midday. July and August offer little relief from the combination of heat and frequent rain; August has the most rain days at 23. September eases to 30°C and brings more sunshine, but its 19 rain days still call for flexible plans. This stretch suits travellers comfortable with heat who do not need reliably dry weather. Pack light clothing and rain protection.
October and November: the best overall balance
October and November are the strongest choices if you want warmth without summer's more demanding conditions. October averages 28°C by day and 22°C at night, so it suits travellers who still want warm evenings. Rain remains a consideration, with 12 rain days, but there is more room for outdoor plans than during the wetter summer months. November is the better pick for avoiding heat: daytime temperatures ease to 25°C, nights to 18°C and rain days to 8. Both months average 5 hours of sunshine daily. Bring light daytime clothes, something warmer for November evenings and a waterproof layer rather than assuming autumn will stay dry.
A little more detail
Hanoi weather FAQs
Plain answers, grounded in the averages.
What is the best time to visit Hanoi?
Judged on warmth, low rainfall and sunshine, the best months in Hanoi are November, October and March. June is the hottest month (average high 32.6°C) and January the coolest (19.7°C).
How many months a year is Hanoi over 25°C?
8 months in Hanoi average a daytime high of 25°C or more, and 11 average 20°C or more.
When is the rainy season in Hanoi?
August is the wettest month in Hanoi (320 mm on average) and February the driest (28 mm). Annual rainfall averages 1729 mm.
What is the hottest temperature recorded in Hanoi?
The hottest day recorded in Hanoi between 1991 and 2020 reached 38.9°C on 3 May 1994; the coldest fell to 3.8°C on 23 December 1999. Records come from daily data for 1991-2020, not from a single station's all-time history.
Which month is best for comfortable outdoor weather?
November offers the best balance, with days averaging 25°C, nights 18°C and 8 rain days. October suits those who prefer warmer conditions, while March is another comfortable option if limited sunshine does not bother you.
Is Hanoi warm enough for light clothes in winter?
Light clothes may suit milder daytime conditions, but bring layers. December and January nights average 14°C, while February nights average 15°C. A jumper or light jacket is a sensible addition, especially if you plan to stay out after dark.
When is rain most likely to affect plans?
May to September has frequent rain, with August averaging 23 rain days and July 21. Keep outdoor plans flexible and carry rain protection. These figures do not mean it rains all day, but they make a completely dry trip less likely.
See also: Vietnam weather by month · where else is hot in June
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid), 1991-2020
Averages computed from daily values at Hanoi. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C