May weather forecast
Hanoi, Vietnam

May in Hanoi signals mid-summer with the city experiencing higher temperatures and significant humidity. The city's peak daytime temperature reaches a scorching 34°C (93.2°F), highlighting the typical tropical summer. With increased rainfall, May also initiates the onset of the monsoon. Despite the higher temperature, the city remains to be a magnet for tourists as it transitions into June, maintaining similar weather conditions but with a bit higher precipitation.

Temperature

As April gives way to May, the average high-temperature displays a slight ascent, adjusting from 30.8°C (87.4°F) to a still tropical 34°C (93.2°F). Hanoi witnesses an average low-temperature of 24.8°C (76.6°F) throughout the month of May.

Heat index

In May, the heat index is evaluated at a life-threatening hot 49°C (120.2°F). Be alert: Heat exhaustion along with heat cramps are probable. Heatstroke is a threat with sustained physical activity.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

In Hanoi, the average relative humidity in May is 74%.

Rainfall

In May, the rain falls for 18.7 days. Throughout May, 74mm (2.91") of precipitation is accumulated. In Hanoi, during the entire year, the rain falls for 181.2 days and collects up to 595mm (23.43") of precipitation.

Daylight

In Hanoi, the average length of the day in May is 13h and 8min.
On the first day of the month, sunrise is at 05:25 and sunset at 18:21. On the last day of May, sunrise is at 05:14 and sunset at 18:34 +07.

Sunshine

In Hanoi, the average sunshine in May is 9h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 7 in May transforms into the following instructions:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.