September weather forecast
Sai Shan, Hong Kong

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

Temperature

Welcoming September, Sai Shan notes an average high-temperature of a moderately hot 29.6°C (85.3°F), nearly consistent with August's 30.5°C (86.9°F). Nights during September maintain a steady temperature, averaging at a still warm 26.5°C (79.7°F).

Heat index

September's mean heat index is computed to be a fiery hot 36°C (96.8°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
In reference to the heat index, it's for places in shade and with a slight wind. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

The average relative humidity in September in Sai Shan is 77%.

Rainfall

In September, the rain falls for 22.7 days. Throughout September, 155mm (6.1") of precipitation is accumulated. Throughout the year, in Sai Shan, there are 224.5 rainfall days, and 1264mm (49.76") of precipitation is accumulated.

Daylight

In Sai Shan, 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, in Sai Shan, sunrise is at 06:14 and sunset at 18:12 HKT.

Sunshine

In Sai Shan, Hong Kong, the average sunshine in September is 8.4h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Sai Shan. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.