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Leopold Chen

Hong Kong experienced a “wet and unseasonably hot” September - the third hottest in recorded history - as the cooler monsoon affecting the city was weaker than normal, the forecaster has said.
The Hong Kong Observatory said on Friday that the city’s mean air temperature during the month was 29.2 degrees Celsius (84.6 Fahrenheit), 1.3 degrees above the average of the same month’s figures from 1991 to 2020.
“Mainly due to the weaker-than-normal northeast monsoon over southern China, September 2024 was much hotter than usual in Hong Kong,” it said.
The mean daily maximum temperature stood at 32 degrees Celsius, 1.5 degrees higher than average, while the daily minimum temperature was 26.8 degrees Celsius, 0.7 degrees higher than usual.
Twelve very hot weather warnings were issued across the month, with the longest one lasting nearly 64 hours, from 6.45am on September 1 to 10.25pm on September 3.
“Under the influence of an anticyclone aloft, the weather of Hong Kong was very hot with sunny periods during the day on the first four days of the month,” the Observatory said.
The forecaster recorded a maximum daily air temperature of 35.7 degrees Celsius on September 17, the highest of the month and the hottest Mid-Autumn Festival since records began in 1884.
The Mid-Autumn Festival is a traditional Chinese holiday held on the 15th day of the eighth month in the lunar calendar.
Hong Kong also saw more rains in September, as the total rainfall of the month reached 520.9mm (20.5 inches), almost 200 millimetres more than usual.
“With stronger than normal troughing flow in the lower atmosphere over the coast of southern China and the northern part of the South China Sea, the month was also cloudier and wetter than usual,” the forecaster explained.
The city experienced strong winds and heavy rain on September 5 to 7 as super typhoon Yagi approached Hong Kong.
“More than 100mm of rainfall was recorded over most parts of Hong Kong from September 5 to 7, and rainfall even exceeded 200mm over the northeastern part of the New Territories,” the Observatory said.
Upper-air disturbances also brought heavy rains to the city on September 8 and 9, as well as on September 28, when the first waterspout was recorded within Victoria Harbour since 1959.


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Forecaster says mean air temperature was 29.2 degrees Celsius, the third hottest September in recorded history


Forecaster says mean air temperature was 29.2 degrees Celsius, the third hottest September in recorded history.


Hong Kong experienced ‘wet and unseasonably hot’ September: Observatory

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}Forecaster says mean air temperature was 29.2 degrees Celsius, the third hottest September in recorded history

Forecaster says mean air temperature was 29.2 degrees Celsius, the third hottest September in recorded history