July weather forecast
Hanoi, Vietnam

Hanoi's July weather forms the heart of summer with high temperatures, increased humidity, and vigorous rain. Indeed, this latter parameter reaches its annual zenith with approximately 92mm (3.62") of rainfall, suggesting the heaviest downpours of the year occur in July. The month, though it brings in dampness with the rain, also presents locals and tourists with refreshing and clear air. The city transitions into August, maintaining similar conditions but with a slight relief in terms of precipitation.

Temperature

The start of July marks an average high-temperature of a hot 34°C (93.2°F), hardly distinguishable from the conditions in June. Throughout the month of July, Hanoi observes an average nighttime temperature of 26.3°C (79.3°F).

Heat index

For most parts of July, the heat index is estimated at a blazing hot 50°C (122°F). Keep wary: Heat cramps along with heat exhaustion are expected. Heatstroke is a possible outcome of ongoing activity.
In terms of the heat index, values are set with light wind and shade conditions in mind. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

In July, the average relative humidity in Hanoi is 76%.

Rainfall

In Hanoi, in July, during 23.3 rainfall days, 92mm (3.62") of precipitation is typically accumulated. In Hanoi, Vietnam, during the entire year, the rain falls for 181.2 days and collects up to 595mm (23.43") of precipitation.

Daylight

In July, the average length of the day in Hanoi is 13h and 16min.
On the first day of July in Hanoi, sunrise is at 05:18 and sunset at 18:42. On the last day of the month, sunrise is at 05:30 and sunset at 18:35 +07.

Sunshine

In July, the average sunshine in Hanoi is 9.6h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: The daily high UV index of 7 in July translates into this advice:
Deflect overexposure. Sun protection is a necessity. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Boost your sun resistance with garments that are densely woven yet spacious.