September weather forecast and climate
Hong Kong, Hong Kong

A bird
A bird's eye view of the lit city of Hong Kong, in Hong Kong Island
September is a transitional month with the summer heat still around and the autumn not yet in full bloom. Rain tapers down to 304.8mm (12") with a drop in humidity as the sun returns on the horizon for a daily 6 hours.
Temperatures are usually around 26.7°C (80.1°F) with the average temperature range in a hot 25.6°C (78.1°F) to 30°C (86°F) as the heat is on a gradual reduction path. An occasional cyclone is still on the calendar with wind-induced low-pressure areas over the South China Sea.
Sunny days are back again as the cloud cover dwindles, and the Mid-Autumn Festival in late September celebrates the arrival of the pleasant weather. For fishing lovers, the Lamma Island Hiking Tour, with its 6000 years of fishing history, is a great place to explore with the reduced rain intensity. Light clothes are the order of the day, while an umbrella is still a handy accessory to shield the rain!

What is the temperature in September in Hong Kong?

The average high-temperature, in September, in Hong Kong, Hong Kong, is 30.1°C (86.2°F), while the average low-temperature is 25.8°C (78.4°F).

What is the average humidity in September in Hong Kong?

In September, the average relative humidity in Hong Kong, Hong Kong, is 78%.

How much does it rain in Hong Kong in September?

In Hong Kong, Hong Kong, in September, it is raining for 14.7 days, with typically 327.6mm (12.9") of accumulated precipitation.

What is the water temperature in September in Hong Kong?

In Hong Kong, Hong Kong, in September, the average water temperature is 28.3°C (82.9°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Hong Kong have in September?

In Hong Kong, the average length of the day in September is 12.3h.

How long on average sun shines in September in Hong Kong?

In September, the average sunshine in Hong Kong, Hong Kong, is 5.7h.

What is the UV index reading in September in Hong Kong?

The average UV index in September in Hong Kong, Hong Kong, is 11.
Average temperature in September - Hong Kong, Hong Kong
  • Average high temperature in September: 30.1°C

The warmest month (with the highest average high temperature) is July (31.4°C).
The month with the lowest average high temperature is January (18.6°C).

  • Average low temperature in September: 25.8°C

The month with the highest average low temperature is July (26.8°C).
The coldest month (with the lowest average low temperature) is January (14.5°C).

Average humidity in September - Hong Kong, Hong Kong
  • Average humidity in September: 78%

Months with the highest relative humidity are April and May (83%).
The month with the lowest relative humidity is December (69%).

Average rainfall in September - Hong Kong, Hong Kong
  • Average rainfall in September: 327.6mm

The wettest month (with the highest rainfall) is June (456.1mm).
The driest month (with the lowest rainfall) is January (24.7mm).

Average rainfall days in September - Hong Kong, Hong Kong
  • Average rainfall days in September: 14.7 days

The month with the highest number of rainy days is June (19.1 days).
The month with the lowest number of rainy days is December (4.5 days).

Average sea temperature in September - Hong Kong, Hong Kong
  • Average sea temperature in September: 28.3°C

The best month for swimming (with the highest average sea temperature) is July (29.1°C).
The coldest month (with the lowest average sea temperature) is February (18.9°C).

Average daylight in September / Average sunshine in September - Hong Kong, Hong Kong
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.5h).
The month with shortest days is December (Average daylight: 10.8h).

  • Average sunshine in September: 5.7h

The month with most sunshine is July (Average sunshine: 6.8h).
The month with least sunshine is March (Average sunshine: 2.9h).

Average UV index in September - Hong Kong, Hong Kong
  • Average UV index in September: 11

Months with the highest UV index are April, May, June, July and August (UV index 12).
Months with the lowest UV index are January, November and December (UV index 7).

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