Hanoi
Vietnam
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Hanoi, Vietnam

The beautiful Tran Quoc Pagoda in Hanoi, Vietnam, with a view of more city structures in the far background
The beautiful Tran Quoc Pagoda in Hanoi, Vietnam, with a view of more city structures in the far background
May, the last month of the spring, in Hanoi, is another hot month, with temperature in the range of an average high of 34°C (93.2°F) and an average low of 24.8°C (76.6°F).

Temperature

In May, the average high-temperature slightly increases, from 30.8°C (87.4°F) in April, to a still hot 34°C (93.2°F). The average low-temperature, in Hanoi, is 24.8°C (76.6°F).

Heat index

In May, the average heat index is appraised at a burning hot 48.9°C (120°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, clothing, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

In Hanoi, during May, the rain falls for 18.7 days and regularly aggregates up to 74mm (2.91") of precipitation. Throughout the year, in Hanoi, there are 181.2 rainfall days, and 595mm (23.43") of precipitation is accumulated.

Daylight

In May, the average length of the day in Hanoi, Vietnam, is 13.1h.

Sunshine

In Hanoi, the average sunshine is 9h.

UV index

Months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in May in Hanoi?

The average high-temperature, in May, in Hanoi, Vietnam, is 34°C (93.2°F), while the average low-temperature is 24.8°C (76.6°F). The average heat index (a.k.a. 'feels like', 'apparent temperature'), that combines air temperature and relative humidity, in May is evaluated at 48.9°C (120°F).

What is the average humidity in May in Hanoi?

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

How much does it rain in Hanoi in May?

In Hanoi, Vietnam, in May, during 18.7 rainfall days, 74mm (2.91") of precipitation is typically accumulated.

How many hours of daylight does Hanoi have in May?

In May, the average length of the day is 13.1h.

How many hours of sunshine does Hanoi have in May?

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

What are the months with the highest UV index in Hanoi?

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

What is the UV index intensity in May in Hanoi?

The average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
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).

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

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

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 lowest rainfall) is February (7mm).

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 lowest number of rainy days is February (7.8 days).

Average daylight in May / Average sunshine in May - Hanoi, Vietnam
  • Average daylight in May: 13.1h

The month with the longest days is June (Average daylight: 13.4h).
The month with shortest days is December (Average daylight: 10.9h).

  • Average sunshine in May: 9h

The month with most sunshine is June (Average sunshine: 10.1h).
The month with least sunshine is January (Average sunshine: 3.7h).

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

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).