Mainly attributed to weaker than normal northeast monsoon over southern China, September 2024 was much hotter than usual in Hong Kong, according to Hong Kong Observatory (HKO).
The mean temperature of 29.2 degrees, mean maximum temperature of 32.0 degrees and mean minimum temperature of 26.8 degrees were 1.3 degrees, 1.5 degrees and 0.7 degrees above the respective normals and were respectively the third, one of the fourth and one of the seventh highest for September on record.
With plenty of sunshine, it was extremely hot on September 17, with temperatures at the Observatory rising to a maximum of 35.7 degrees, the highest of the month and also the hottest Mid-Autumn Festival on record.
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 mean amount of cloud in the month was 74 percent, 8 percent above the normal of 66 percent and one of the ninth highest on record for September. The monthly total rainfall was 520.9 millimeters, about 62 percent above the normal figure of 321.4 millimeters. The accumulated rainfall this year up to September was 2104.3 millimeters, about 6 percent lower than the normal figure of 2242.8 millimeters for the same period.
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