September weather forecast
Sai Wan, Hong Kong

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Weather in September

September starts to slowly wind down from the peak of summer in Sai Wan. The city sees a fusion of late summer heat and the early arrival of autumnal cool breezes. Despite the first rustle of fallen leaves, afternoons remain sweltering, and the city's general atmosphere carries a residual humidity. The decline in rainfall is worth noting, decreasing significantly to a still substantial 155mm (6.1"). The dramatic shifts in Sai Wan's weather add a unique layer to its appeal.

Temperature

September's climate shows a minor adjustment in average high-temperatures to a moderately hot 29.6°C (85.3°F) from August's 30.5°C (86.9°F). Sai Wan's nocturnal readings in September exhibit minimal variation from the daytime temperatures, averaging at a still warm 26.5°C (79.7°F).

Heat index

In September, the average heat index is appraised at a fiery hot 36°C (96.8°F). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', combines both the air temperature and the humidity level to give a perceived human temperature. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Sai Wan, during September, the rain falls for 22.7 days and regularly aggregates up to 155mm (6.1") of precipitation. In Sai Wan, during the entire year, the rain falls for 224.5 days and collects up to 1264mm (49.76") of precipitation.

Daylight

The average length of the day in September in Sai Wan is 12h and 17min.
On the first day of September in Sai Wan, 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 Sai Wan, the average sunshine in September is 8.4h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. 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. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.

Frequently asked questions

How hot is it in Sai Wan in September?

During September, Sai Wan experiences an average high-temperature of 29.6°C (85.3°F) and a low-temperature of 26.5°C (79.7°F). The average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, in September is appraised at 36°C (96.8°F).

What is the average humidity in September in Sai Wan?

The average relative humidity in September is 77%.

How much does it rain in Sai Wan in September?

In Sai Wan, Hong Kong, during September, the rain falls for 22.7 days and regularly aggregates up to 155mm (6.1") of precipitation.

How many hours of daylight does Sai Wan have in September?

In Sai Wan, the average day length in September is 12h and 17min.

When is the sunrise / sunset in September in Sai Wan?

In September, on the first day of the month, 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.

How many hours of sunshine does Sai Wan have in September?

In September, the average sunshine duration in Sai Wan, Hong Kong, is 8.4h.

What is the month with the highest UV index in Sai Wan?

The months with the highest UV index in Sai Wan, Hong Kong, are May through September, with an average maximum UV index of 7.

What is the UV index intensity in September in Sai Wan?

In Sai Wan, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.

Average temperature in September
Sai Wan, Hong Kong

Average temperature in September - Sai Wan, Hong Kong
  • Average high temperature in September: 29.6°C

The warmest month (with the highest average high temperature) is August (30.5°C).
The month with the lowest average high temperature is January (18.5°C).

  • Average low temperature in September: 26.5°C

The month with the highest average low temperature is August (27.7°C).
The coldest month (with the lowest average low temperature) is January (15°C).

Average pressure in September
Sai Wan, Hong Kong

Average pressure in September - Sai Wan, Hong Kong
  • Average pressure in September: 1008.3mbar

The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is August (1004.8mbar).

Average wind speed in September
Sai Wan, Hong Kong

Average wind speed in September - Sai Wan, Hong Kong
  • Average wind speed in September: 13.5km/h

The windiest month (with the highest average wind speed) is December (16km/h).
The calmest month (with the lowest average wind speed) is August (12.4km/h).

Average humidity in September
Sai Wan, Hong Kong

Average humidity in September - Sai Wan, Hong Kong
  • Average humidity in September: 77%

The month with the highest relative humidity is May (84%).
The month with the lowest relative humidity is December (70%).

Average rainfall in September
Sai Wan, Hong Kong

Average rainfall in September - Sai Wan, Hong Kong
  • Average rainfall in September: 155mm

The wettest month (with the highest rainfall) is August (223mm).
The driest month (with the least rainfall) is December (23mm).

Average rainfall days in September
Sai Wan, Hong Kong

Average rainfall days in September - Sai Wan, Hong Kong
  • Average rainfall days in September: 22.7 days

The month with the highest number of rainy days is July (26.8 days).
The month with the least rainy days is December (11.2 days).

Average daylight in September /
Average sunshine in September
Sai Wan, Hong Kong

Average daylight in September / Average sunshine in September - Sai Wan, Hong Kong
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 30min).
The month with the shortest days is December (Average daylight: 10h and 48min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is March (Average sunshine: 5h and 18min).

Average sunshine days in September
Sai Wan, Hong Kong

Average sunshine days in September - Sai Wan, Hong Kong
  • Average sunshine days in September: 5.8 days

The month with the most sunshine days is December (16.9 days).
The month with the least sunshine days is July (3.1 days).

Average UV index in September
Sai Wan, Hong Kong

Average UV index in September - Sai Wan, Hong Kong
  • Average UV index in September: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).

Average cloud cover in September
Sai Wan, Hong Kong

Average cloud cover in September - Sai Wan, Hong Kong
  • Average cloud cover in September: 35

The month with the most cloud cover is March (Cloud cover 61).
The months with the least cloud cover are September and October (Cloud cover 35).

Average visibility in September
Sai Wan, Hong Kong

Average visibility in September - Sai Wan, Hong Kong
  • Average visibility in September: 10km

The months with the highest visibility are September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July and August (9km).

Sai Wan, Hong Kong

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