September weather forecast
Sheung Shui, Hong Kong

September introduces the first whispers of a departing summer in Sheung Shui, Hong Kong. Temperatures start to recede, registering highs of 30.5°C (86.9°F) accompanied by a substantial drop to 25.9°C (78.6°F) at night. A gradual decrease in humidity to 75% and rainfall to 66mm (2.6") is witnessed, signaling an imminent transition into autumn. Although the heat remains, the climate begins to shift, providing respite from the extreme conditions of the preceding months. The slight cooling allows opportunities to explore the outdoors before the winter sets in.

Temperature

The transition from August to September sees average high-temperatures adjusting to a still hot 30.5°C (86.9°F), from a not significantly different 31.4°C (88.5°F). Sheung Shui encounters a small divergence from daytime high temperatures, averaging a low-temperature of 25.9°C (78.6°F) during September nights.

Heat index

The average heat index in September is evaluated at a torrid 38°C (100.4°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. 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. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

The average relative humidity in September in Sheung Shui, Hong Kong, is 75%.

Rainfall

In September, in Sheung Shui, the rain falls for 17.9 days. Throughout September, 66mm (2.6") of precipitation is accumulated. Throughout the year, in Sheung Shui, there are 164.9 rainfall days, and 548mm (21.57") of precipitation is accumulated.

Daylight

The average length of the day in September in Sheung Shui 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 Sheung Shui, Hong Kong, the average sunshine in September is 8.1h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the maximum UV index of 7 suggests these recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.