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

April 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
April in Hanoi, Vietnam, is a hot spring month, with temperature in the range of an average high of 30.8°C (87.4°F) and an average low of 21.8°C (71.2°F).

Temperature

In April, the average high-temperature marginally rises, from a moderately hot 26.8°C (80.2°F) in March, to a hot 30.8°C (87.4°F). In Hanoi, the average low-temperature is 21.8°C (71.2°F).

Heat index

In April, the average heat index is evaluated at a torrid 39.2°C (102.6°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like pregnancy, metabolic differences, wind, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Hanoi, Vietnam, the average relative humidity in April is 77%.

Rainfall

In April, in Hanoi, Vietnam, the rain falls for 14.8 days. Throughout April, 32mm (1.26") of precipitation is accumulated. In Hanoi, during the entire year, the rain falls for 181.2 days and collects up to 595mm (23.43") of precipitation.

Daylight

In Hanoi, the average length of the day is 12.6h.

Sunshine

The average sunshine in Hanoi is 7.2h.

UV index

In April, the average daily maximum UV index in Hanoi, Vietnam, is 6. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. 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 April in Hanoi?

The average high-temperature, in April, is 30.8°C (87.4°F), while the average low-temperature is 21.8°C (71.2°F). In April, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that combines relative humidity and air temperature, is calculated to 39.2°C (102.6°F).

What is the average humidity in April in Hanoi?

In Hanoi, the average relative humidity in April is 77%.

How much does it rain in Hanoi in April?

In Hanoi, in April, during 14.8 rainfall days, 32mm (1.26") of precipitation is typically accumulated.

How many hours of daylight does Hanoi have in April?

The average length of the day in April in Hanoi, Vietnam, is 12.6h.

How long on average sun shines in April in Hanoi?

In April, the average sunshine in Hanoi is 7.2h.

What is the UV index reading in April in Hanoi?

The average daily maximum UV index in April in Hanoi is 6. A UV Index reading of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV rays.
Average temperature in April - Hanoi, Vietnam
  • Average high temperature in April: 30.8°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 April: 21.8°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 April - Hanoi, Vietnam
  • Average humidity in April: 77%

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

Average rainfall in April - Hanoi, Vietnam
  • Average rainfall in April: 32mm

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

Average rainfall days in April - Hanoi, Vietnam
  • Average rainfall days in April: 14.8 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 April / Average sunshine in April - Hanoi, Vietnam
  • Average daylight in April: 12.6h

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 April: 7.2h

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 April - Hanoi, Vietnam
  • Average UV index in April: 6

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).