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HK records hottest September ever

05 October 2021

By The SUN

Record temperatures on Sept 22, a statutory holiday, failed to stop
 these Filipinas from having fun (Facebook photo)

September 2021 will go down Hong Kong’s history books as the hottest September on record.

The average maximum temperature recorded for the month was 32.8 degrees, monthly mean average was 29.7 degrees, and the minimum average was 27.8 degrees.

These are 2.3 degrees, 1.8 degrees and 1.7 degrees above the corresponding normal figures between 1981 to 2010, making all of them the highest on record for September.

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A statement released by the government today, Oct 5, said the historic spike in temperatures last month was due to “stronger than usual subtropical ridge over South China.”

More records were set last month, when 15 very hot days and 11 hot nights were recorded.

From January to September this year, a total of 53 hot days and 57 hot nights were recorded – which both exceeded the figures recorded in 2020.


September 2021 was also much drier than usual with a total rainfall of just 129.6 millimetres, or about 40 percent less than the normal figure of 321.4mm (or about 40 per cent of the 1981-2010 normal of 327.6mm).

As such, the accumulated rainfall recorded in the first nine months of the year was 1 650.7mm, about 26 per cent below the normal figure of 2 242.8mm for the same period (or about 26 per cent below the 1981-2010 normal of 2 233.1mm).


For most of the time from Sept 1 to 12, the weather in the city was sunny and very hot, apart from a few showers and isolated thunderstorms.

But temperatures peaked at 34.5 degrees on Sept 12, which the Observatory attributed to the extreme heat brought about the departure of Typhoon Chanthu from Hong Kong.

The daily mean temperature of 31.2 degrees on that day was the joint highest on record for September.   

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The high temperatures triggered thunders with some showers in some parts of the city from Sept 13 to 17.

The daily minimum temperature of 29.5 degrees on Sept 13 was the joint highest on record for September.

The extreme temperatures caused hail to fall over TKO on Sept 16

On Sept 16 hail was reported at around 1pm in Tseung Kwan O, along with more than 100 millimeters of rainfall. On the same day, a man was reported to have died after being struck by lightning in Clear Water Bay that afternoon.  

There were a few showers and isolated thunderstorms with sunny periods from Sept 18 to 19, then more sunny periods over the Mid-Autumn Festival from Sept 20 to 22, with the heat triggering showers and thunder.

With plenty of sunshine, the temperature recorded at the Observatory soared to a high of 34 degrees in the afternoon of Sept. 22, making it the hottest day following the Mid-Autumn Festival on record.      

Occasional showers and squally thunderstorms cooled temperatures to a minimum of 26 degrees, the lowest for the month. However, this was still the highest monthly minimum temperature recorded for September.

The weather remained sunny on Sept 24 to 26, then gradually turned mainly fine towards the end of the month due to some isolated showers and thunderstorms.

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