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Climate in Hanoi (Vietnam)


Average weather, temperature, rainfall, sunshine hours

Flag - Vietnam

Hanoi, where it is located


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Climate chart - Hanoi
In Hanoi, the capital of Vietnam, there is a subtropical climate, with very mild winters and hot, humid and rainy summers. The sun shines quite rarely. The rainiest period is from June to September, due to the monsoon of Southeast Asia.
The city is located in northern Vietnam, at 21 degrees north latitude, at the beginning of the Red River Delta and about 90 km (55 mi) from the coast of the Gulf of Tonkin.
On average, about 1,600 mm (63 in) of rain fall per year, of which more than 150 mm (6 in) per month fall in May and October, and more than 250 mm (10 in) from June to September. Although precipitation in winter is weak, especially from January onwards, there are frequent drizzles.

Hanoi

The winter, from December to February, is mild, with a January average of 17 °C (62.5 °F), however, the sky is often cloudy, especially in January and February, and as mentioned, drizzle can occur. Furthermore, in this season, air pollution is often high.
Winter averages are a little higher than in the far north of Vietnam, however, sometimes there can be very cool periods here as well, with lows around 7/8 °C (45/46 °F) and highs around 15 °C (59 °F). More rarely, it can even get cold for a few days, and highs can drop to around 10 °C (50 °F). In January 2016, there was a day with a minimum of 5 °C (41 °F) and a maximum of 8 °C (46.5 °F). In the mountain massif of Ba Vì, which is located about 40 km (25 mi) west of the city and measures 1,296 meters (4,252 feet) in height, it even snowed on that occasion.

In April and May, before the monsoon, it can get very hot, but also from June to September, in the pauses between a period of bad weather and the next. At the beginning of June 2017, the temperature reached 41 °C (106 °F).

The summer, from May to September, is hot and muggy, with frequent and sometimes heavy rains.

Hanoi is a dull city, in fact, the sun is rarely seen from January to April, but even in summer, it does not shine very often because of the summer monsoon. There are about 1,585 hours of sunshine per year.

On the coast near Hanoi (see Haiphong), the sea is a bit cool from January to March, while it is very warm in the summer months. Anyway, in winter, cool and cloudy weather conditions which prevail in this season are usually not inviting for swimming.

Hanoi can be hit by typhoons, the tropical cyclones of Southeast Asia, even though it is not on the coast, which is the area most at risk. Typically, typhoons pass in this area from late May to early November, with a maximum from July to October.

Best Time



In Hanoi, there is no time of year when the temperatures are mild, the sun shines and there is little rain. However, you can choose spring and autumn, and in particular, from mid-March to mid-April and from the end of October to the end of November.
In winter, December is a little sunnier and less cool than January and February.

Hanoi - Climate data


In Hanoi, the average temperature of the coldest month (January) is of 17.1 °C, that of the warmest month (June) is of 30 °C. Here are the average temperatures.
Hanoi - Average temperatures (1991-2020)
Temperatures (°C)
MonthMinMaxMean
January14.120.117.1
February15.821.518.6
March18.323.721
April21.72824.9
May24.43228.2
June26.13430
July26.233.629.9
August25.832.929.3
September24.83228.4
October22.229.826
November18.826.422.6
December1522.218.6
Year21.128.124.55

Precipitation amounts to 1610 millimeters per year: it is therefore abundant. It ranges from 20 millimeters in the driest months (January, February, December) to 275 millimeters in the wettest one (August). Here is the average precipitation.
Hanoi - Average precipitation
MonthRain (mm)Days
January2010
February2012
March3516
April10514
May16514
June26515
July25516
August27517
September24514
October15511
November608
December205
Year1610152

There are on average around 1585 sunshine hours per year. Here are the average hours of sunshine per day.
Hanoi - Sunshine hours
MonthAverageTotal
January2.575
February1.545
March1.545
April390
May6185
June5.5170
July6.5195
August5.5175
September6175
October5.5165
November4.5135
December4125
Year4.31585

Hanoi - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)


January, the coldest month of the year, is generally a very mild month. The average temperature is of 17.1 °C, with a minimum of 14.1 °C and a maximum of 20.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 8.5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27.5 °C.
Rain iconPrecipitation amounts to 20 mm, distributed over 10 days.
The day lasts on average 11 hours and 0 minutes.
Sun iconThere are on average 2.5 hours of sunshine per day. So, the sun shines 22% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is of 9.8 kph.


February is generally a warm month. The average temperature is of 18.6 °C, with a minimum of 15.8 °C and a maximum of 21.5 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 10.5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 28.5 °C.
Rain iconPrecipitation amounts to 20 mm, distributed over 12 days.
The day lasts on average 11 hours and 30 minutes.
Sun iconThere are on average 1.5 hours of sunshine per day. So, the sun shines 15% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of 10.6 kph.


March is generally a warm month. The average temperature is of 21 °C, with a minimum of 18.3 °C and a maximum of 23.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 12.5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 30.5 °C.
Rain iconPrecipitation amounts to 35 mm, distributed over 16 days.
The day lasts on average 12 hours and 0 minutes.
Sun iconThere are on average 1.5 hours of sunshine per day. So, the sun shines 13% of the time.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is of 10.3 kph.


April is generally a warm to hot, muggy month. The average temperature is of 24.9 °C, with a minimum of 21.7 °C and a maximum of 28 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 16.5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 34 °C.
Rain iconPrecipitation amounts to 105 mm, distributed over 14 days.
The day lasts on average 12 hours and 35 minutes.
Sun iconThere are on average 3 hours of sunshine per day. So, the sun shines 24% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is of 11 kph.


May is generally a very hot, muggy month. The average temperature is of 28.2 °C, with a minimum of 24.4 °C and a maximum of 32 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 20.5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 37.5 °C.
Rain iconPrecipitation amounts to 165 mm, distributed over 14 days.
The day lasts on average 13 hours and 5 minutes.
Sun iconThere are on average 6 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of 10.8 kph.


June, the hottest month of the year, is generally a very hot, muggy month. The average temperature is of 30 °C, with a minimum of 26.1 °C and a maximum of 34 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 23 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 38 °C.
Rain iconPrecipitation amounts to 265 mm, distributed over 15 days.
The day lasts on average 13 hours and 25 minutes. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is of 9.8 kph.


July is generally a very hot, muggy month. The average temperature is of 29.9 °C, with a minimum of 26.2 °C and a maximum of 33.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 23.5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 37.5 °C.
Rain iconPrecipitation amounts to 255 mm, distributed over 16 days.
The day lasts on average 13 hours and 20 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of 9.8 kph.


August is generally a very hot, muggy month. The average temperature is of 29.3 °C, with a minimum of 25.8 °C and a maximum of 32.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 23 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 36.5 °C.
Rain iconPrecipitation amounts to 275 mm, distributed over 17 days.
The day lasts on average 12 hours and 50 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is of 8.5 kph.


September is generally a very hot, muggy month. The average temperature is of 28.4 °C, with a minimum of 24.8 °C and a maximum of 32 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 22 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 35.5 °C.
Rain iconPrecipitation amounts to 245 mm, distributed over 14 days.
The day lasts on average 12 hours and 10 minutes.
Sun iconThere are on average 6 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of 8.1 kph.


October is generally a warm to hot, muggy month. The average temperature is of 26 °C, with a minimum of 22.2 °C and a maximum of 29.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 17.5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 33.5 °C.
Rain iconPrecipitation amounts to 155 mm, distributed over 11 days.
The day lasts on average 11 hours and 35 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is of 8.4 kph.


November is generally a warm to hot, muggy month. The average temperature is of 22.6 °C, with a minimum of 18.8 °C and a maximum of 26.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 14 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 31.5 °C.
Rain iconPrecipitation amounts to 60 mm, distributed over 8 days.
The day lasts on average 11 hours and 5 minutes.
Sun iconThere are on average 4.5 hours of sunshine per day. So, the sun shines 41% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is of 8.6 kph.


December is generally a warm month. The average temperature is of 18.6 °C, with a minimum of 15 °C and a maximum of 22.2 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 9.5 °C.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 28.5 °C.
Rain iconPrecipitation amounts to 20 mm, distributed over 5 days.
The day lasts on average 10 hours and 55 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
Sun iconThere are on average 4 hours of sunshine per day. So, the sun shines 37% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is of 9 kph.

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