Monsoon Precipitation Variability in Southeast Asia
Summary
Monsoon precipitation in Southeast Asia is characterised by a pronounced seasonal cycle, with the southwest monsoon delivering the bulk of annual rainfall from May to September and the northeast monsoon providing a secondary wet season from November to March. Variability arises across intraseasonal, interannual and decadal timescales. Intraseasonal fluctuations are largely driven by the Madden–Julian Oscillation, which modulates convection on 30–60-day timescales. Interannual changes reflect teleconnections to the El Niño–Southern Oscillation and the Indian Ocean Dipole, while decadal shifts are linked to basin-scale sea surface temperature patterns and long-term warming trends. Tropical cyclones and shear lines further intensify local extreme events, particularly over archipelagic regions. Spatial heterogeneity is evident: the Greater Mekong Subregion has exhibited seesaw patterns of summer rainfall, and the Philippines has experienced increasing frequency of heavy-rainfall days in recent decades. Understanding these patterns is critical for water-resource management, agricultural planning and flood-risk mitigation across a densely populated and economically diverse region.
Research from Nature Portfolio
A foundational study introduced region-specific monsoon indices for Indochina based on wind anomaly patterns. Four separate indices, tailored to seasonal variations over southern Myanmar and Thailand, outperform conventional monsoon metrics by capturing local precipitation anomalies with greater correlation and consistency. These indices offer a standardised framework for monitoring monsoon strength, improving climate-model evaluation and informing regional forecast systems.
Monsoon Precipitation Variability in Southeast Asia publication trend
The graph below shows the total number of articles in monsoon precipitation variability in southeast asia across all publications each year (not limited to Nature Index journals).
Technical terms
Monsoon: Seasonal reversal of prevailing winds and associated shifts between wet and dry periods over South and Southeast Asia.
El Niño–Southern Oscillation (ENSO): Coupled ocean–atmosphere phenomenon in the tropical Pacific that drives interannual climate variability worldwide.
Teleconnection: Climatic linkage by which anomalies in one region influence weather and climate in a distant area.
Monsoon Index: Quantitative metric derived from atmospheric variables, such as wind anomalies, used to characterise monsoon strength and variability.
Shear line: Boundary in the lower atmosphere marked by a sharp gradient in wind speed or direction that can initiate organised convection and heavy rainfall.
References
- Shear lines trigger heavy rainfalls in the Philippines during the winter monsoon. npj Climate and Atmospheric Science (2024).
- Past and Future Modulation of the ENSO Teleconnection to Southeast Asian Rainfall by Interbasin Interactions. Geophysical Research Letters (2025).
- Interdecadal variation of summer rainfall in the Greater Mekong Subregion and its possible causes. Environmental Research Letters (2021).
- Indo-China Monsoon Indices. Scientific Reports (2015).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.