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 brings with it an average high-temperature of a still hot 33.1°C (91.6°F), showing a negligible variation from the month before. Hanoi's nighttime temperature during August is consistently averaged at a moderately hot 25.5°C (77.9°F).

Heat index

In August, the average heat index is estimated at a life-threatening hot 49°C (120.2°F). Heed: Expect heat cramps and heat exhaustion. Continued action may cause heatstroke.
Heat index data is primarily for areas with shade and subjected to light winds. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The months with the highest humidity in Hanoi are August and September, with an average relative humidity of 80%.

Rainfall

The month with the most rainfall in Hanoi 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 the month, sunrise is at 05:30 and sunset at 18:35. On the last day of August, 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 estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index, 7 during August, leads to the following recommendations:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.