Hotter days and warmer nights for Malaysia as climate change intensifies

 

MALAYSIA is facing a future of hotter days, warmer nights and increasingly frequent heatwaves as climate change accelerates across Southeast Asia, with experts warning that the country must prepare for more severe environmental and economic consequences.

What was once dismissed as seasonal heat is now emerging as a long-term climate trend.

Climatology and Climate Change expert at the National University of Malaysia, Professor Emeritus Dr Fredolin Tangang, said rising temperatures in Southeast Asia mirror the broader pattern of global warming, with the region approaching the critical 1.5°C warming threshold above pre-industrial levels.

According to him, over the past five to ten years, Southeast Asia has experienced temperature increases of around 0.3 to 0.4°C. This shows a consistent warming trend rather than a temporary fluctuation.

While countries such as Thailand, Vietnam and Myanmar face more frequent heatwaves, Malaysia is not insulated from the effects.

Local weather patterns are influenced by climate systems such as El Niño, the Madden-Julian Oscillation (MJO) and the Indian Ocean Dipole (IOD), but global warming remains a dominant factor.

The world is already experiencing unprecedented heat.  Fredolin said 2024 was the hottest year on record, with global temperatures reaching approximately 1.55°C above pre-industrial levels, while 2023 and 2025 ranked among the hottest years ever documented.

Although Malaysia naturally experiences a hot and humid tropical climate, current warming trends have moved beyond normal climatic variation.

“The increasingly prolonged and intense heatwaves indicate that the global climate system is becoming more unstable,” he said.

The primary driver remains greenhouse gas emissions, particularly carbon dioxide produced through fossil fuel combustion, deforestation and large-scale land-use changes.

Carbon dioxide concentrations have now reached around 420 parts per mil (ppm), far exceeding the natural range of 180 to 300 ppm over the past million years.

“The burning of fossil fuels and deforestation trap more heat in the Earth’s atmosphere. Around 91% of this excess heat is absorbed by the oceans, influencing regional temperatures and climate systems, including Southeast Asia,” Fredolin explained.

Malaysia is already witnessing these impacts. Data from the Malaysian Meteorological Department (METMalaysia) show that the nation’s average daily temperature is rising by approximately 0.19°C every decade.

More concerning is that minimum temperatures are rising faster than daytime highs, meaning nights are becoming warmer at a quicker pace.

METMalaysia director-general Mohd Hisham Mohd Anip said long-term average maximum temperatures have increased by 0.14°C per decade, while minimum temperatures have risen by 0.26°C.

“This proves that the warming taking place is no longer temporary,” he said.

Urbanisation is worsening the problem. Rapid development, deforestation and land-use changes have intensified the urban heat island effect, where concrete and asphalt trap heat while green spaces diminish.

The phenomenon is especially evident in Malaysia’s urban centres and west coast regions.

Station data show Subang recording temperature increases of about 0.37°C per decade, followed by Bayan Lepas at 0.35°C and Senai at 0.31°C.

The Klang Valley, Penang and Johor Bahru are among the areas most affected. Rising temperatures also bring consequences beyond discomfort.

Public health risks include heatstroke, dehydration and respiratory illnesses, while hotter and drier conditions heighten the risk of forest fires and haze.

The economic implications are equally significant. Hot weather and declining water supplies threaten agriculture, food security and labour productivity, particularly in construction, farming and logistics.

“Hot weather and reduced water supplies will affect agricultural output and the economy as a whole,” Fredolin warned.

Looking ahead, Malaysia is expected to experience longer and more frequent heatwaves.

METMalaysia defines a heatwave as temperatures exceeding 37°C for at least three consecutive days, while extreme heatwaves involve temperatures above 40°C.

So far, the country has crossed the 40°C mark only once — in Chuping, Perlis, on April 9, 1998.

By 2035, Malaysia’s average daily temperature is projected to reach around 27.7°C, about 0.53°C above the 1991–2020 average. Experts say adaptation can no longer wait.

Proposed measures include planting more trees, expanding green and water spaces in urban areas, and establishing cooling centres for vulnerable groups such as the elderly and children during extreme heat events.

The warning is clear: climate change is no longer a distant threat for Malaysia but an unfolding reality demanding urgent preparation and action. — Focus Malaysia