May weather forecast
Hanoi, Vietnam

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The beautiful Tran Quoc Pagoda in Hanoi, Vietnam
The beautiful Tran Quoc Pagoda in Hanoi, Vietnam

Weather in May

May in Hanoi signals mid-summer with the city experiencing higher temperatures and significant humidity. The city's peak daytime temperature reaches a scorching 34°C (93.2°F), highlighting the typical tropical summer. With increased rainfall, May also initiates the onset of the monsoon. Despite the higher temperature, the city remains to be a magnet for tourists as it transitions into June, maintaining similar weather conditions but with a bit higher precipitation.

Temperature

A slight uplift of average high-temperatures is noted in May in Hanoi, with temperatures adjusting from a hot 30.8°C (87.4°F) in April to a still tropical 34°C (93.2°F). Hanoi records an average low-temperature of 24.8°C (76.6°F) throughout the month of May.

Heat index

The heat index in May is estimated at a burning hot 49°C (120.2°F). Precaution: Heat cramps along with heat exhaustion are possible. Heatstroke is a serious risk with continued exertion.
Heat index details are generally centered around shaded locations and a mild breeze. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In May, the average relative humidity is 74%.

Rainfall

In Hanoi, in May, during 18.7 rainfall days, 74mm (2.91") of precipitation is typically accumulated. In Hanoi, during the entire year, the rain falls for 181.2 days and collects up to 595mm (23.43") of precipitation.

Daylight

The average length of the day in May is 13h and 8min.
On the first day of May in Hanoi, Vietnam, sunrise is at 05:25 and sunset at 18:21. On the last day of the month, sunrise is at 05:14 and sunset at 18:34 +07.

Sunshine

In May, the average sunshine in Hanoi is 9h.

UV index

The months with the highest UV index in Hanoi, Vietnam, are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 in May interprets into the following advice:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
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Frequently asked questions

How hot is it in Hanoi in May?

In May, in Hanoi, the average high-temperature is 34°C (93.2°F), and the average low-temperature is 24.8°C (76.6°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in May is estimated at 49°C (120.2°F).

What is the average humidity in May in Hanoi?

The average relative humidity in May in Hanoi, Vietnam, is 74%.

How much does it rain in Hanoi in May?

In Hanoi, during May, the rain falls for 18.7 days and regularly aggregates up to 74mm (2.91") of precipitation.

What is the average length of the day in May in Hanoi?

The average day length in May is 13h and 8min.

When are sunrise and sunset in May in Hanoi?

In May, on the first day of the month, sunrise is at 05:25 and sunset at 18:21. On the last day of the month, in Hanoi, Vietnam, sunrise is at 05:14 and sunset at 18:34 +07.

How many hours of sunshine does Hanoi have in May?

The average sunshine duration in May in Hanoi is 9h.

When is the highest UV index in Hanoi?

The months with the highest UV index in Hanoi, Vietnam, are May through September, with an average maximum UV index of 7.

What is the UV index intensity in May in Hanoi?

In May, the average daily maximum UV index in Hanoi is 7. A UV Index reading of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in May
Hanoi, Vietnam

Average temperature in May - Hanoi, Vietnam
  • Average high temperature in May: 34°C

The warmest month (with the highest average high temperature) is June (35.4°C).
The month with the lowest average high temperature is January (20.7°C).

  • Average low temperature in May: 24.8°C

The month with the highest average low temperature is June (26.6°C).
The coldest month (with the lowest average low temperature) is January (14.4°C).

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Average pressure in May
Hanoi, Vietnam

Average pressure in May - Hanoi, Vietnam
  • Average pressure in May: 1006.7mbar

The month with the highest atmospheric pressure is January (1019.2mbar).
The month with the lowest atmospheric pressure is June (1003.1mbar).

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Average wind speed in May
Hanoi, Vietnam

Average wind speed in May - Hanoi, Vietnam
  • Average wind speed in May: 8.7km/h

The windiest month (with the highest average wind speed) is March (9.9km/h).
The calmest months (with the lowest average wind speed) are August and September (6.9km/h).

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Average humidity in May
Hanoi, Vietnam

Average humidity in May - Hanoi, Vietnam
  • Average humidity in May: 74%

The months with the highest relative humidity are August and September (80%).
The month with the lowest relative humidity is December (69%).

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Average rainfall in May
Hanoi, Vietnam

Average rainfall in May - Hanoi, Vietnam
  • Average rainfall in May: 74mm

The wettest month (with the highest rainfall) is August (135mm).
The driest month (with the least rainfall) is February (7mm).

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Average rainfall days in May
Hanoi, Vietnam

Average rainfall days in May - Hanoi, Vietnam
  • Average rainfall days in May: 18.7 days

The month with the highest number of rainy days is July (23.3 days).
The month with the least rainy days is February (7.8 days).

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Average daylight in May /
Average sunshine in May
Hanoi, Vietnam

Average daylight in May / Average sunshine in May - Hanoi, Vietnam
  • Average daylight in May: 13h and 1min

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).

  • Average sunshine in May: 9h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in May
Hanoi, Vietnam

Average sunshine days in May - Hanoi, Vietnam
  • Average sunshine days in May: 10.3 days

The month with the most sunshine days is December (19.6 days).
The month with the least sunshine days is July (6.2 days).

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Average UV index in May
Hanoi, Vietnam

Average UV index in May - Hanoi, Vietnam
  • Average UV index in May: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is December (UV index 4).

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Average cloud cover in May
Hanoi, Vietnam

Average cloud cover in May - Hanoi, Vietnam
  • Average cloud cover in May: 46

The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is June (Cloud cover 40).

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Average visibility in May
Hanoi, Vietnam

Average visibility in May - Hanoi, Vietnam
  • Average visibility in May: 9km

The months with the highest visibility are February, March and June (10km).
The months with the lowest visibility are January, April, May, July, August, September, October, November and December (9km).

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Hanoi, Vietnam

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