May weather forecast
Hong Kong, Hong Kong

As May introduces the early phase of summer, the city of Hong Kong gears up for prolonged sunshine and increased heat. The characteristic traits of May include longer daylight hours and a significant rise in both daily and nightly temperatures. Alongside these conditions, the levels of rainfall rise to 305mm (12.01"). Consequently, the region witnesses a mixed weather pattern of sunny days followed by periodic rain showers. This combination can result in a humid atmosphere and balmy evenings, highlighting the start of the tropical summer months.

Temperature

May's arrival coincides with a marginal rise in the average high-temperature, moving from April's warm 25°C (77°F) to a still moderately hot 28.4°C (83.1°F). A consistent nighttime average temperature of 24.1°C (75.4°F) is maintained during May.

Heat index

May's mean heat index is calculated to be a tropical 34°C (93.2°F). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
Heat index data is primarily for areas with shade and subjected to light winds. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', reflects the feeling of heat when considering both air temperature and humidity. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.

Humidity

The months with the highest humidity are April and May, with an average relative humidity of 83%.

Rainfall

In Hong Kong, in May, it is raining for 14.7 days, with typically 305mm (12.01") of accumulated precipitation. Throughout the year, in Hong Kong, there are 137.8 rainfall days, and 2398mm (94.41") of precipitation is accumulated.

Sea temperature

In Hong Kong, Hong Kong, the average seawater temperature in May is 26.8°C (80.2°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.

Daylight

In Hong Kong, the average length of the day in May is 13h and 13min.
On the first day of the month, sunrise is at 05:51 and sunset at 18:49. On the last day of May, sunrise is at 05:39 and sunset at 19:03 HKT.

Sunshine

In Hong Kong, Hong Kong, the average sunshine in May is 4.5h.

UV index

April through August, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an excessive health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 12 in May transforms into the following instructions:
Carry out all important precautions, unprotected skin could get burns in no time. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Experience reduced UV exposure by about half when donning a wide-brim hat. Regardless of cloud cover, it's recommended to apply generously and reapply often a sunscreen with an SPF of at least 30, especially after swimming or any outdoor activity. Caution! Sand and water reflections can notably increase the UV radiation intensity.