Hong Kong Records All-Time High Temperature as Typhoon Dolphin Makes Landfall in Zhejiang

Hong Kong sweltered through its hottest day in recorded history on Sunday, August 9, 2026, as Typhoon Dolphin pushed a mass of warm air across the territory before making landfall hundreds of kilometers to the northeast along China's Zhejiang coast.

The Hong Kong Observatory logged 36.9°C at 17:50 local time, surpassing the previous record of 36.6°C set on August 22, 2017, just ahead of Typhoon Hato (The Guardian). The Observatory's temperature series extends back to 1884, making this the highest reading in 142 years of continuous measurement. Its Regional Weather webpage confirmed the 36.9°C figure at the corresponding timestamp (HKO).

The mechanism is a familiar one in tropical cyclone dynamics. As Dolphin tracked northward through the East China Sea, its outer circulation drew warm, subsiding air across southern China and the Pearl River Delta. Subsidence compresses and heats the air mass, pushing surface temperatures to extreme values in the periphery of the storm system. The Asharq Al-Awsat report identified this warm-air advection as the direct contributor to Hong Kong's record high (Asharq Al-Awsat).

The Observatory issued a "very hot weather warning" on Sunday, advising residents to drink water and avoid vigorous outdoor physical activities. The warning is part of the Observatory's tiered alert system for extreme heat, activated when conditions pose a risk of heatstroke or heat exhaustion.

At Sheung Shui in northern Hong Kong, near the border with Shenzhen, an automatic weather station recorded 39.8°C. That reading is the highest logged anywhere in Hong Kong since the automatic weather station network was introduced in the 1980s (The Guardian). It underscores the spatial variability of the event: the Observatory's headline figure comes from its headquarters station near the urban core, where maritime influence and urban canyon effects produce a different thermal profile than inland locations in the northern New Territories.

Meanwhile, Dolphin itself made landfall near Yuhuan, Zhejiang, at approximately 5:30 p.m. local time (09:30 GMT) on Sunday. Maximum sustained winds near the center were recorded at 94 mph (151 km/h), placing the system at the equivalent of a Category 1 hurricane on the Saffir-Simpson scale (The Guardian).

The juxtaposition of a record-setting heat event in Hong Kong with a typhoon landfall in Zhejiang is consistent with the subsidence-warming pattern that frequently accompanies western Pacific tropical cyclones. When a storm tracks north of Hong Kong, the territory sits in the system's southwestern quadrant, where descending air suppresses convection and drives temperatures upward. The 2017 record followed the same archetype: Hato, a much stronger storm at landfall, had its approach preceded by a spike in Hong Kong temperatures as its outer subsidence zone settled over the region.

What stands out in this event is the margin of the record. The 36.9°C reading exceeds the 2017 benchmark by 0.3°C, a notable jump for a 142-year series in which the top readings are clustered within a narrow band. The Sheung Shui figure of 39.8°C, approaching 40°C, further signals that the thermal conditions in the storm's periphery were exceptional even by the standards of past typhoon-associated heat events in the region.

The broader context here is the trajectory of Hong Kong's high-temperature records. The territory's top readings have historically been tied to tropical cyclone dynamics rather than standalone heatwaves, which means the record is as much a statement about Dolphin's track and structure as it is about the background climate state. The fact that the two highest temperatures in 142 years of observation both occurred in the context of approaching typhoons nine years apart raises questions about whether the subsidence-warming mechanism is intensifying as baseline oceanic and atmospheric temperatures rise. The available data from this single event cannot answer that question, but it adds a data point to a pattern that climatologists and regional meteorological agencies will be examining closely.

For Zhejiang, the immediate concern shifts to the hazards of landfall: damaging winds, storm surge along the coast near Yuhuan, and heavy rainfall across the province's interior. At Category 1 equivalent intensity, Dolphin is capable of producing localized destruction, particularly in coastal communities, though it is considerably less powerful than the storms that have driven the most catastrophic landfalls in the region's recent history.