May weather forecastHa Long, Vietnam

Weather in May

May in Ha Long embraces the onset of tropical weather. Among the notable changes is an influx of substantial rainfall, with 163mm (6.42") recorded to fall over the course of May. Simultaneously, temperature highs, lows, and sea temperatures ascend, evaporating the increasing supply of rainwater. Despite the uptick in rainfall, the city's charm continues to captivate visitors, who are greeted by misty landscapes and sparkling rainforests. While the rainfall does dampen the sunlit hours, the city never loses its exotica.

Temperature

The average high-temperature for May is a still tropical 33.3°C (91.9°F), closely aligning with the temperature of the preceding month. Throughout May, an average nighttime temperature of 24°C (75.2°F) is experienced.

Heat index

The heat index in May is estimated at a blazing hot 47°C (116.6°F). Notice: Heat cramps and heat exhaustion are likely. Continued strenuous activity might lead to heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. 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. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In May, the average relative humidity is 76%.

Rainfall

In Ha Long, in May, it is raining for 22.7 days, with typically 163mm (6.42") of accumulated precipitation. Throughout the year, there are 237.1 rainfall days, and 1472mm (57.95") of precipitation is accumulated.

Sea temperature

In Ha Long, in May, the average water temperature is 27.3°C (81.1°F).
Note: Between the temperatures of 25°C (77°F) and 29°C (84.2°F), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.

Daylight

In May, the average length of the day is 13h and 8min.
On the first day of May, sunrise is at 05:21 and sunset at 18:16. On the last day of the month, sunrise is at 05:10 and sunset at 18:29 +07.

Sunshine

The average sunshine in May is 8.9h.

UV index

April through August, 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 exposure to the Sun's UV rays for the ordinary person.
Note: A typical high UV index of 7 in May suggests the following recommendations:
Ward off overexposure. Defence against solar harm is crucial. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Take note! The UV strength of the Sun elevates when reflected off water and sand.