September weather forecast
Lo Wu, Hong Kong

September, the first month of the autumn in Lo Wu, is also a hot month, with an average temperature fluctuating between 30.5°C (86.9°F) and 25.9°C (78.6°F).

Temperature

September's climate shows a minor adjustment in average high-temperatures to a still tropical 30.5°C (86.9°F) from August's 31.4°C (88.5°F). A minimal decline in temperature from daytime highs is anticipated in Lo Wu, Hong Kong throughout the September nights, averaging a moderately hot 25.9°C (78.6°F).

Heat index

The heat index in September is computed to be a sweltering 38°C (100.4°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', gives a temperature feeling by integrating air temperature and humidity. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

In September, the average relative humidity is 75%.

Rainfall

In September, in Lo Wu, the rain falls for 17.9 days. Throughout September, 66mm (2.6") of precipitation is accumulated. In Lo Wu, during the entire year, the rain falls for 164.9 days and collects up to 548mm (21.57") of precipitation.

Daylight

In September, the average length of the day in Lo Wu is 12h and 17min.
On the first day of September, 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 8.1h.

UV index

The months with the highest UV index in Lo Wu are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index of 7 during September leads to these instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.