September weather forecast
Hang Hau, Hong Kong

The first month of the autumn, September, is also a moderately hot month in Hang Hau, Hong Kong, with an average temperature varying between 29.6°C (85.3°F) and 26.5°C (79.7°F).

Temperature

The arrival of September brings an average high-temperature of a moderately hot 29.6°C (85.3°F), closely following the temperature pattern of August. In Hang Hau, the month of September brings a consistent average low-temperature of 26.5°C (79.7°F), slightly cooler than its daytime highs.

Heat index

September's average heat index is computed to be a very hot 36°C (96.8°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In September, the average relative humidity in Hang Hau is 77%.

Rainfall

In Hang Hau, in September, during 22.7 rainfall days, 155mm (6.1") of precipitation is typically accumulated. Throughout the year, there are 224.5 rainfall days, and 1264mm (49.76") of precipitation is accumulated.

Daylight

The average length of the day in September in Hang Hau is 12h and 17min.
On the first day of the month, sunrise is at 06:05 and sunset at 18:39. On the last day of September, sunrise is at 06:14 and sunset at 18:11 HKT.

Sunshine

In September, the average sunshine is 8.4h.

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 hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: During September, 7 as the daily maximum UV index converts into the following advice:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.