Hong Kong Breaks 142-Year Heat Record as Typhoon Dolphin Passes By

Hong Kong recorded its hottest day in 142 years of continuous temperature measurements on Sunday, August 9, 2026, as Typhoon Dolphin pushed a blanket of warm air across the territory before striking China's Zhejiang coast hundreds of kilometers to the northeast.

The Hong Kong Observatory logged 36.9°C at 5:50 p.m. local time, edging past the previous record of 36.6°C set on August 22, 2017, just ahead of Typhoon Hato (The Guardian). The Observatory's temperature series dates back to 1884. Its Regional Weather webpage confirmed the 36.9°C figure at the corresponding timestamp (HKO).

The science behind this is a well-known pattern in tropical cyclone behavior. Think of a typhoon as a giant engine: air rises rapidly at its center, but on the outer edges of the storm, air sinks back down. When air sinks, it gets compressed and heats up — the same way a bicycle pump feels warm where the air is compressed inside. As Dolphin tracked northward through the East China Sea, this sinking, compressing air spread across southern China and the Pearl River Delta, driving temperatures to extremes on the storm's periphery. Asharq Al-Awsat 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 strenuous outdoor activity. The warning is part of a tiered alert system activated when conditions risk heatstroke or heat exhaustion.

At Sheung Shui in northern Hong Kong, near the border with Shenzhen, an automatic weather station recorded 39.8°C — the highest reading anywhere in Hong Kong since the automatic station network was introduced in the 1980s (The Guardian). The gap between that figure and the Observatory's headline 36.9°C reflects how much temperatures can vary across a small territory: the Observatory's headquarters sits near the urban core, where sea breezes and the density of buildings create a different thermal profile than inland areas in the northern New Territories.

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 reached 94 mph (151 km/h), placing the storm at the equivalent of a Category 1 hurricane on the Saffir-Simpson scale (The Guardian).

The pairing of a record heat event in Hong Kong with a typhoon landfall in Zhejiang follows a familiar pattern in western Pacific storms. When a typhoon tracks north of Hong Kong, the territory sits in the storm's southwestern quadrant, where descending air suppresses cloud formation and drives temperatures up. The 2017 record followed the same template: Hato, a far stronger storm at landfall, was preceded by a temperature spike as its outer sinking-air 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 highest readings cluster within a narrow band. The Sheung Shui figure of 39.8°C, approaching 40°C, further signals that conditions on the storm's periphery were exceptional even by the standards of past typhoon-driven heat events.

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 this record tells us as much about Dolphin's track and structure as it does about the background climate. The fact that the two highest temperatures in 142 years both occurred alongside approaching typhoons, nine years apart, raises questions about whether the sinking-air warming mechanism is intensifying as baseline ocean and atmospheric temperatures rise. A 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 localized destruction, particularly in coastal communities, though it is considerably less powerful than the storms responsible for the region's most catastrophic landfalls in recent history.