May weather forecast
Hai Phong, Vietnam

In May, Hai Phong is in the throes of summer. It's one of the hottest months, with temperatures commonly reaching their highest levels. The majority of the days bring about intensive sunlight and high UV rates. In addition to high temperatures, May also experiences increased rainfall, which does little to alleviate the overall heat. The highest observed temperature reaches up to 30.5°C (86.9°F). While the weather is quite hot, the exquisite beauty of Hai Phong during the summer months remains undeniable.

Temperature

Observing a minor shift, the average high-temperature during May adjusts from April's moderately hot 26.2°C (79.2°F) to a hot 30.5°C (86.9°F). During May nights, Hai Phong records an average temperature of 24°C (75.2°F).

Heat index

In May, the average heat index is computed to be an extremely hot 42°C (107.6°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

The average relative humidity in May is 87%.

Rainfall

In Hai Phong, in May, during 9.6 rainfall days, 241mm (9.49") of precipitation is typically accumulated. In Hai Phong, during the entire year, the rain falls for 104.3 days and collects up to 2209mm (86.97") of precipitation.

Sea temperature

In May, the average sea temperature is 27.3°C (81.1°F).
Note: Water temperature ranging between 25°C (77°F) and 29°C (84.2°F) is considered very warm and pleasing for everyone. It allows for enjoyable water activities over extended periods without discomfort.

Daylight

The average length of the day in May is 13h and 8min.
On the first day of the month, sunrise is at 05:22 and sunset at 18:17. On the last day of May, sunrise is at 05:11 and sunset at 18:30 +07.

Sunshine

In May, the average sunshine is 6.4h.

UV index

The months with the highest UV index are March through August, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 12 during May translates into the following guidance:
Ensure all key precautions. Defense against sun exposure is critical. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Use liberally and reapply a broad-spectrum SPF 30+ sunscreen every two hours, or straight away after any outdoor workout or swim. Attention! The combination of sand and water reflections enhances UV ray intensity.