September weather forecast
Cheung Chau, Hong Kong

September, the first month of the autumn in Cheung Chau, is still a tropical month, with an average temperature varying between 26.4°C (79.5°F) and 30°C (86°F).

Temperature

September welcomes an average high-temperature of a still tropical 30°C (86°F), not much different from the preceding month. A mean low-temperature of 26.4°C (79.5°F) is a distinguishing feature of September, indicating a slight dip from daytime highs.

Heat index

The heat index value during September is computed to be a sweltering 37°C (98.6°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
When referencing the heat index, its values are suitable for shady environments and light breezes. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', marries air temperature and humidity to produce a value illustrating perceived warmth. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values hold particular significance for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. 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. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In Cheung Chau, the average relative humidity in September is 76%.

Rainfall

In Cheung Chau, in September, during 22.7 rainfall days, 150mm (5.91") of precipitation is typically accumulated. In Cheung Chau, Hong Kong, during the entire year, the rain falls for 207.6 days and collects up to 1194mm (47.01") of precipitation.

Daylight

The average length of the day in September is 12h and 17min.
On the first day of the month, sunrise is at 06:06 and sunset at 18:40. On the last day of September, sunrise is at 06:14 and sunset at 18:12 HKT.

Sunshine

In September, the average sunshine in Cheung Chau is 8.2h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.