September weather forecast
Ma Liu Shui, Hong Kong

September, the first month of the autumn in Ma Liu Shui, is still a tropical month, with temperature in the range of an average low of 26.3°C (79.3°F) and an average high of 30°C (86°F).

Temperature

The arrival of September brings an average high-temperature of a still hot 30°C (86°F), nearly identical to August's 31.3°C (88.3°F). The nighttime temperature demonstrates a marginal decline, averaging at a moderately hot 26.3°C (79.3°F) during September.

Heat index

For September, the heat index is estimated at a fiery hot 37°C (98.6°F). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. 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 relevant to children. 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.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

In September, the average relative humidity in Ma Liu Shui is 76%.

Rainfall

In Ma Liu Shui, during September, the rain falls for 19.8 days and regularly aggregates up to 94mm (3.7") of precipitation. In Ma Liu Shui, during the entire year, the rain falls for 187.1 days and collects up to 771mm (30.35") of precipitation.

Daylight

In September, the average length of the day in Ma Liu Shui, Hong Kong, is 12h and 17min.
On the first day of September in Ma Liu Shui, 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 8.2h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the UV index of 7 transforms into the following advice:
Deflect overexposure. Sun protection is a necessity. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.