Asep Darmawan
Hong Kong experienced a searing heatwave on Saturday, with temperatures in some districts climbing above 38 degrees Celsius, a phenomenon attributed to the outer subsiding air of Tropical Cyclone Dolphin. The Hong Kong Observatory (HKO) issued warnings of persistently extremely hot weather expected to grip the territory for the next couple of days, with some areas potentially reaching or exceeding 37 degrees Celsius. This intense heat is forecast to continue into the midweek of the following week, before a shift to rainy conditions by Wednesday, as a southwesterly airstream is anticipated to influence the Guangdong coast.
Understanding the Meteorological Drivers
Tropical Cyclone Dolphin, though tracking towards the vicinity of Zhejiang and northern Fujian provinces, has exerted a significant meteorological influence on Hong Kong. The cyclone’s outward-spreading subsiding air, a common characteristic of such systems, creates a high-pressure dome that suppresses cloud formation and allows solar radiation to heat the surface intensely. This atmospheric setup is particularly potent in generating heatwaves, especially when coupled with other contributing factors.
The HKO’s forecast indicates that this period of extreme heat is not an isolated incident. The observatory had previously warned that Hong Kong might be on track for record-breaking high temperatures in both the current and following year. This projection is underscored by the escalating impacts of climate change and the predicted intensification of El Niño events. El Niño, a naturally occurring climate phenomenon characterized by the warming of sea surface temperatures in the central and eastern equatorial Pacific, can have far-reaching effects on global weather patterns, often leading to hotter and drier conditions in some regions, including parts of Asia.
A Stark Contrast to Recent Weather Patterns
The current heatwave presents a striking contrast to Hong Kong’s recent weather history. Just last month, July 2026, was recorded as the second-rainiest July on record for the city. This period saw a substantial amount of rainfall, accompanied by a high frequency of severe weather warnings, including 20 amber rainstorm warnings and five red rainstorm warnings. This dramatic shift from record-breaking rainfall to an oppressive heatwave highlights the increasing volatility and unpredictability of weather patterns, a hallmark of a changing climate.
The Growing Threat of Extreme Heat
The scientific consensus on the increasing intensity and frequency of heatwaves is unequivocal. The Intergovernmental Panel on Climate Change (IPCC) has extensively documented how human-caused climate change has been driving these trends since the mid-20th century. The continued accumulation of greenhouse gases, such as carbon dioxide, in the atmosphere traps heat, leading to a rise in the planet’s surface temperature. This warming directly translates into hotter and longer-lasting heatwaves, posing significant risks to human health and ecosystems.
Research and studies paint a concerning picture for the future. A 2023 study highlighted the potential for heat and humidity to reach lethal levels for extended periods by the end of the century in various parts of the world, rendering outdoor activities impossible in some regions. Hong Kong itself has already experienced a significant warming trend, with temperatures rising by approximately 1.7 degrees Celsius since the Industrial Revolution, according to research by NGO Berkeley Earth. This baseline warming exacerbates the impact of heatwaves, making them more dangerous and prolonged.
Implications for Public Health and Infrastructure
The sustained period of extreme temperatures carries significant implications for public health. Vulnerable populations, including the elderly, young children, and individuals with pre-existing health conditions, are at increased risk of heat-related illnesses such as heatstroke, heat exhaustion, and dehydration. Public health authorities typically issue advisories urging residents to stay hydrated, seek cool environments, and limit outdoor activities during such periods. Hospitals and emergency services often see an increase in heat-related admissions.
Beyond public health, extreme heat can also strain urban infrastructure. Power grids can be put under immense pressure as demand for air conditioning surges. Water resources can be depleted more rapidly, and the risk of wildfires can increase in surrounding natural areas. The economic impact can also be substantial, affecting productivity in outdoor industries and potentially disrupting supply chains.
A Look at Past Heat Events and Climate Projections
Hong Kong has a history of experiencing intense heatwaves, but the current trend suggests an intensification of these events. In recent years, the city has witnessed multiple instances where temperatures have soared to uncomfortable and even dangerous levels. For example, in May 2025, residents were seen seeking respite in parks amidst oppressive hot weather, as documented by HKFP’s photojournalism. These recurring events serve as stark reminders of the warming climate.
The linkage between El Niño and heightened temperatures in Hong Kong is a crucial factor in understanding current and future heat risks. During an El Niño event, atmospheric circulation patterns can shift, leading to increased solar radiation and reduced rainfall in certain regions. This can amplify the impact of existing warming trends, pushing temperatures to new extremes. The forecast for a "super-strong" El Niño event raises concerns about the potential for unprecedented heat conditions in the coming years.
Broader Context of Climate Change and Extreme Weather
The intensifying heatwaves in Hong Kong are part of a global pattern of escalating extreme weather events, driven by anthropogenic climate change. The scientific community has consistently warned about the need for urgent action to mitigate greenhouse gas emissions and adapt to the inevitable impacts of a warming planet. Reports from organizations like the IPCC provide detailed assessments of observed changes and future projections, emphasizing the critical role of human activities in driving these shifts.
The increase in the intensity and frequency of heatwaves, alongside other extreme weather phenomena such as heavy rainfall, droughts, and more powerful storms, underscores the interconnectedness of the Earth’s climate system. The consequences of unchecked climate change extend beyond immediate weather events, affecting biodiversity, agricultural productivity, water security, and geopolitical stability.
Official Responses and Public Awareness
The Hong Kong Observatory plays a vital role in monitoring weather conditions and issuing timely warnings to the public. Its accurate forecasting and clear communication are essential for enabling individuals and authorities to prepare for and respond to extreme weather events. The observatory’s continuous efforts to inform the public about climate trends and their implications are crucial for fostering greater awareness and preparedness.
In addition to official warnings, non-governmental organizations and research institutions contribute significantly to public understanding of climate change and its impacts. Reports and analyses from bodies like Berkeley Earth and the IPCC provide the scientific foundation for understanding the long-term trends and risks. The ongoing efforts to highlight the dangers of extreme heat, as seen in articles discussing how it has become a "deadliest silent killer," are vital for galvanizing public attention and driving action.
The Path Forward: Adaptation and Mitigation
Addressing the challenges posed by escalating heatwaves requires a multi-pronged approach, encompassing both mitigation and adaptation strategies. Mitigation efforts focus on reducing greenhouse gas emissions to slow down the rate of global warming. This involves transitioning to renewable energy sources, improving energy efficiency, and promoting sustainable land-use practices.
Adaptation strategies, on the other hand, aim to reduce the vulnerability of communities and ecosystems to the impacts of climate change that are already occurring or are unavoidable. For Hong Kong, this could include developing more resilient urban infrastructure, enhancing public health preparedness for heatwaves, promoting water conservation, and protecting green spaces that can help mitigate urban heat island effects.
The recurring and intensifying heatwaves, driven by the complex interplay of tropical cyclones, El Niño, and long-term climate change, serve as a stark reminder of the urgent need for global and local action. As Hong Kong continues to grapple with these extreme weather events, fostering greater public awareness, strengthening preparedness measures, and committing to sustainable practices will be paramount in safeguarding the well-being of its residents and the resilience of its environment. The current heatwave, a direct consequence of these evolving climate patterns, underscores the imperative to act decisively and collectively.
Jia Lissa
Dwi Wanna
