[REVISION HISTORY]

Hong Kong extreme heatwave and warning system debate

Updated 4 times since CLSTR started tracking revisions of this situation.

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2026-08-13 01:56 UTC → 2026-08-25 02:29 UTC · added ~~removed~~

Hong Kong has experienced record-breaking extreme heat, recording its highest temperature since meteorological observations began in 1884. The Hong Kong Observatory measured 36.9°C in Tsim Sha Tsui, while Sheung Shui reached 39.8°C, the highest recorded since automatic weather stations were introduced in the 1980s. The heatwave is attributed to sinking air and the peripheral air mass of Severe Typhoon Dolphin. The extreme conditions have intensified debates regarding the city’s heat stress warning system. Discrepancies have emerged between the Hong Kong Heat Index (HKHI) used by the Labour Department and the Wet-Bulb Globe Temperature (WBGT) data released by the Hong Kong Observatory. On August 9, all 10 monitoring stations recorded WBGT indices above 31, which constitutes a ‘maximum red danger level’ under Japanese standards. However, the Labour Department maintained a ‘yellow’ warning—the lowest level—arguing that low humidity and wind speeds mitigated the risk. Critics, including meteorologists and labor unions, argue the HKHI is ineffective for outdoor workers because it places significantly less weight on solar radiation (5%) compared to the international WBGT standard (20%). While the Labour Department has acknowledged the need to review ~~and optimize~~ the ~~mechanism to increase sensitivity,~~ mechanism, concerns ~~remain~~ persist for vulnerable ~~groups such as the~~ groups. A Greenpeace survey highlighted this vulnerability, finding that 78.7% of low-income elderly ~~and pregnant women. To assist,~~ residents surveyed experienced physical or mental distress due to extreme heat. Data from the ~~Home Affairs~~ Department ~~has provided temporary heat shelters across all 18 districts during Very Hot Weather Warnings. Additionally, reports indicate some bus companies have implemented~~ of Health shows that between 2015 and 2024, annual hospital discharges and deaths related to heatstroke among residents aged 65 and older rose 16-fold. Factors such as inadequate housing and financial constraints preventing air conditioning ~~temperature limits to manage costs, resulting in warmer cabin temperatures for passengers.~~ use exacerbate these risks.

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