September weather forecast
Sheung Shui Wa Shan, Hong Kong

The first month of the autumn, September, is still a hot month in Sheung Shui Wa Shan, Hong Kong, with an average temperature fluctuating between 26.1°C (79°F) and 30.7°C (87.3°F).

Temperature

The shift into September records an average high-temperature of a still hot 30.7°C (87.3°F), subtly varied from August's 31.4°C (88.5°F). Sheung Shui Wa Shan maintains a minor drop in temperature during September nights, with averages of 26.1°C (79°F).

Heat index

The heat index for September is appraised at a fiery hot 38°C (100.4°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

The average relative humidity in September is 75%.

Rainfall

In Sheung Shui Wa Shan, in September, it is raining for 18.9 days, with typically 73mm (2.87") of accumulated precipitation. In Sheung Shui Wa Shan, during the entire year, the rain falls for 165.9 days and collects up to 555mm (21.85") of precipitation.

Daylight

In Sheung Shui Wa 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, sunrise is at 06:14 and sunset at 18:12 HKT.

Sunshine

The average sunshine in September is 7.9h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Sheung Shui Wa Shan. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high daily UV index of 7 during September translates into the following directions:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.