September weather forecast
Ha Fa Shan, Hong Kong

September, the first month of the autumn in Ha Fa Shan, is still a tropical month, with an average temperature ranging between max 30°C (86°F) and min 26.3°C (79.3°F).

Temperature

Ha Fa Shan's shift into September is marked by a subtle change to a still hot 30°C (86°F) from August's 31.3°C (88.3°F) in temperature. Ha Fa Shan experiences a minimal drop from daytime high temperatures, recording an average low-temperature of 26.3°C (79.3°F) throughout September.

Heat index

In September, the average heat index is appraised at a fiery hot 37°C (98.6°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', gives a temperature feeling by integrating air temperature and humidity. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In Ha Fa Shan, Hong Kong, the average relative humidity in September is 76%.

Rainfall

In Ha Fa Shan, Hong Kong, in September, it is raining for 19.8 days, with typically 94mm (3.7") of accumulated precipitation. In Ha Fa Shan, during the entire year, the rain falls for 187.1 days and collects up to 771mm (30.35") of precipitation.

Daylight

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

Sunshine

In September, the average sunshine 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 reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: An average UV index of 7 in September transforms into this advice:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.