June weather forecast
Hong Kong, Hong Kong

June in Hong Kong signals the full arrival of the hot summer season. Marked by longer daylight hours and higher temperatures, the weather takes on the distinct characteristics of tropical summer. The striking feature of June is the maximum rainfall recorded for any month, peaking at a staggering 456mm (17.95"). These periods of heavy rain are interspersed with sunny intervals, leading to an unpredictably varying daily weather pattern. Despite the high incidence of rain, June is still recognized for its generally high temperature and increased humidity.

Temperature

Hong Kong's shift into June is marked by a subtle change to a hot 30.2°C (86.4°F) from May's 28.4°C (83.1°F) in temperature. In June, Hong Kong temperatures settle at a low of 26.2°C (79.2°F) during the nights, reflecting a minor change from daytime highs.

Heat index

Throughout June, the heat index is calculated to be a sweltering 39°C (102.2°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a value derived by merging air temperature with the humidity to convey how the climate feels. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are highly critical for babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

In Hong Kong, the average relative humidity in June is 82%.

Rainfall

The month with the most rainfall is June, when the rain falls for 19.1 days and typically aggregates up to 456mm (17.95") of precipitation.

Sea temperature

In Hong Kong, in June, the average water temperature is 28.4°C (83.1°F).
Note: For engaging in water activities including swimming and diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are perceived as perfect, providing pleasure for extended durations.

Daylight

June has the longest days of the year, with an average of 13h and 30min of daylight.
On the first day of June in Hong Kong, sunrise is at 05:38 and sunset at 19:03. On the last day of the month, sunrise is at 05:42 and sunset at 19:11 HKT.

Sunshine

The average sunshine in June is 4.9h.

UV index

The months with the highest UV index in Hong Kong are April through August, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In June, the average maximum UV index of 12 translates into the following recommendations:
Employ every precaution of importance, unprotected skin and eyes could burn within moments. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Even if it's cloudy, generously apply and frequently reapply a sunscreen with no less than a 30 sun protection factor after each swim or outdoor exercise. Watch out! Reflections from sand and water can surge UV radiation exposure.