September weather forecast
Chai Wan, Hong Kong

September, the first month of the autumn in Chai Wan, is also a moderately hot month, with an average temperature ranging between max 29.6°C (85.3°F) and min 26.5°C (79.7°F).

Temperature

As August turns into September, the average high-temperatures rest at a warm 29.6°C (85.3°F), showing a minor variation from the prior month. Nighttime readings during September register a minimal drop from daytime highs, averaging at 26.5°C (79.7°F).

Heat index

The average heat index in September is estimated at a sweltering 36°C (96.8°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. 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 isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

The average relative humidity in September in Chai Wan is 77%.

Rainfall

In Chai Wan, during September, the rain falls for 22.7 days and regularly aggregates up to 155mm (6.1") of precipitation. In Chai Wan, during the entire year, the rain falls for 224.5 days and collects up to 1264mm (49.76") of precipitation.

Daylight

In September, the average length of the day is 12h and 17min.
On the first day of September, sunrise is at 06:05 and sunset at 18:40. On the last day of the month, sunrise is at 06:14 and sunset at 18:11 HKT.

Sunshine

In September, the average sunshine is 8.4h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 7 during September translates into these guidelines:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.