August weather forecast
Hanoi, Vietnam

August carries forward the high summer temperatures from July but grants Hanoi a slight relief from rain with a slight decrease in precipitation. This month indeed crowns itself with the maximum average relative humidity of 80%. Despite the high humidity level, the city sustains a noteworthy weather characteristic of maintaining fairly stable wind speeds. The transition from August to September offers a respite from the summer heat while still maintaining substantial wet conditions.

Temperature

The onset of August manifests an average high-temperature of a still tropical 33.1°C (91.6°F), demonstrating a minor variation from the preceding month. Throughout August, Hanoi registers a consistent average low-temperature of 25.5°C (77.9°F).

Heat index

During August, the heat index is evaluated at a life-threatening hot 49°C (120.2°F). Stay vigilant: Heat cramps along with heat exhaustion are expected. Heatstroke may follow prolonged exertion.
Heat index's context suggests values are appropriate for shady areas and slight breezes. With 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 'real feel' or 'apparent temperature', reflects the feeling of heat when considering both air temperature and humidity. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling 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 months with the highest humidity are August and September, with an average relative humidity of 80%.

Rainfall

The month with the most rainfall is August, when the rain falls for 21.5 days and typically aggregates up to 135mm (5.31") of precipitation.

Daylight

In August, the average length of the day is 12h and 50min.
On the first day of August, sunrise is at 05:30 and sunset at 18:35. On the last day of the month, sunrise is at 05:40 and sunset at 18:13 +07.

Sunshine

In Hanoi, the average sunshine in August is 9.5h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for average individuals.
Note: In August, the average maximum UV index of 7 translates into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.