The Southwest Monsoon season, which began last Thursday, is expected to continue until mid-September, bringing hotter and drier weather conditions compared to normal, with an increased risk of haze and potential impacts on public health.
Malaysia Meteorological Department (MetMalaysia) Director-General Dr Mohd Hisham Mohd Anip said the country is expected to experience lower rainfall during this period, with more rain-free days than rainy days.
He said that although the season is generally dry, heavy rain, thunderstorms and strong winds may still occur in certain areas, particularly in the western part of Peninsular Malaysia, northern Sarawak and western Sabah, especially during the early morning due to squall line activity.
He added that Sarawak, as well as central to southern parts of the west coast of Peninsular Malaysia, are expected to experience more significant effects, with rainfall projected to be below average from June to September.
The hot and dry conditions are attributed to rising temperatures and reduced humidity, which may also pose health risks to the public.
Dr Mohd Hisham warned that the situation could increase the risk of dehydration and heat-related illnesses such as heatstroke, especially among vulnerable groups including children, the elderly, and those with existing health conditions.
He also noted that haze risks are expected to rise during the peak of the Southwest Monsoon due to the hotter and drier conditions, which may increase the likelihood of forest, bush, and peatland fires both locally and in neighbouring countries.
If such fires are not controlled promptly, the resulting smoke could lead to localised and transboundary haze episodes.
He further explained that a weak El Niño phenomenon is expected to influence the drier weather pattern this year.
Based on global climate models, the weak El Niño is projected to develop in June 2026, strengthen gradually, and persist into early 2027, contributing to hotter and drier-than-usual conditions.
The public is advised to avoid open burning, reduce outdoor activities during extreme heat, stay hydrated, wear appropriate clothing, and prioritise health and safety, especially for high-risk groups.
