Malaysia Enters Monsoon Phase to Ease Haze
The transition brings increased rainfall expected to reduce atmospheric pollutants by the end of October.
Updated on Oct. 20, 2026 in Forecasts
Live Poll
Do you believe environmental air quality issues are primarily resolved by natural weather cycles?
Malaysia is entering a monsoon transition phase that is forecast to alter wind patterns and increase rainfall across the country. This shift in weather is expected to ease regional haze conditions by the end of October 2026.
Why it matters
Increased rainfall is crucial for reducing fire activity and smoke emissions in pollution-source areas. These conditions help lower atmospheric pollutant concentrations and limit the movement of smoke.
Official outlooks forecast October rainfall between 220mm and 330mm for Selangor and 240mm to 360mm for Kuala Lumpur. Some 10-day periods in parts of Indonesia are expected to see low rainfall below 50mm.
The players
Malaysian Meteorological Department
This national agency is responsible for monitoring weather patterns and providing long-range climate outlooks for Malaysia.
Indonesian Meteorology, Climatology and Geophysics Agency
Known as BMKG, this agency tracks meteorological data in Indonesia and analyzes regional rainfall trends.
The details
The Malaysian Meteorological Department reports that the transition phase will shift wind speeds and directions significantly. Data from the Indonesian Meteorology, Climatology and Geophysics Agency suggests that increased precipitation will help suppress fires in Sumatra and Kalimantan.
Timeline
October 13, 2026: BMKG released analysis on regional rainfall expectations.
October 2026: Monsoon transition phase begins.
End of October 2026: Expected gradual improvement in haze conditions.
October to December 2026: Forecast period for increased rainfall in Indonesia.
March 2027: End of long-range weather outlook period.
Seasonal Patterns
Regional cooperation on atmospheric data is mandated by the ASEAN Agreement on Transboundary Haze Pollution to mitigate smoke impacts. This meteorological coordination reflects historical patterns of data-sharing required to manage seasonal transboundary air quality issues.
Residents in affected areas should monitor local air quality alerts as conditions fluctuate during the transition. Follow official guidance from regional meteorological agencies regarding outdoor activities until haze levels fully dissipate.
The takeaway
Transition phases between monsoons often dictate air quality and rainfall patterns across Southeast Asia for the remainder of the year. Keeping track of regional meteorological reports can help anticipate fluctuations in local haze levels.
Further reading
Learn more about regional weather trends on our Forecasts page.
Live Poll
Do you believe environmental air quality issues are primarily resolved by natural weather cycles?
