Indonesia is bracing for a challenging climate cycle as the Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) warns that the 2026 dry season will likely be drier and more prolonged than average. While the transition is currently in its early stages, the agency is signaling a high probability of El Niño developing in the latter half of the year, a phenomenon that historically triggers severe water shortages and agricultural stress across the archipelago.
As of late March 2026, the BMKG reports that 7% of Indonesia’s Seasonal Zones (Z0M) have already officially entered the dry season. This initial shift is expected to accelerate rapidly, with the majority of the country predicted to transition into the dry season throughout April, May, and June 2026.
The early onset of dryness is already visible in several fragmented regions. According to Teuku Faisal Fathani, Head of the BMKG, dry conditions have already taken hold in small portions of Aceh, North Sumatra, and Riau, as well as parts of Central, South, and Southeast Sulawesi. The trend extends eastward to small areas of the West Nusa Tenggara (NTB) and East Nusa Tenggara (NTT) provinces, Maluku, and parts of West Papua.
The Looming Threat of El Niño in 2026
While the current state of the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) remains in a neutral phase, climate modeling points toward a shift. The BMKG predicts a significant likelihood that ENSO will evolve into an El Niño phase during the second half of 2026.
Ardhasena Sopaheluwakan, the BMKG’s Deputy for Climatology, indicated that the probability of El Niño developing is currently between 50% and 80%. Most models suggest the intensity will fall within the weak to moderate categories, though there remains a small possibility—less than 20%—that the phenomenon could escalate into a strong El Niño.
For Indonesia, an El Niño event typically means suppressed rainfall and higher surface temperatures. When combined with natural climate variability, the result is often a “longer and drier” season that can jeopardize food security and increase the risk of forest and land fires.
Navigating the ‘Spring Predictability Barrier’
Meteorologists are urging the public and policymakers to interpret current data with caution due to a scientific phenomenon known as the spring predictability barrier. This occurs during the Northern Hemisphere’s spring (March, April, and May), during which the accuracy of ENSO prediction models typically drops significantly.
As of this barrier, forecasts generated in March and April are generally only reliable for a three-month window. Determining the exact trajectory of El Niño requires a complex understanding of multi-factor interactions and their teleconnections to the Indonesian region. The BMKG is maintaining a rigorous monitoring schedule to refine these projections.
Confidence in these predictions is expected to rise sharply by May 2026. Statistically, forecasts issued in May offer much higher reliability for predicting climate conditions up to six months into the future, providing a clearer picture of how severe the late-year drought may become.
Anticipating the Impact: Risks and Readiness
The convergence of a naturally dry cycle and a potential El Niño event creates a high-risk environment for several key sectors. Agriculture is the most vulnerable, as prolonged dry spells can lead to crop failures and water scarcity for irrigation. The increased dryness elevates the risk of peatland fires in Sumatra and Kalimantan.
In response, the BMKG is calling for “precision steps” from all stakeholders. This includes water management strategies for farmers, increased vigilance from disaster management agencies, and the adoption of drought-resistant crop varieties where possible.
To ensure public safety and economic stability, the agency emphasizes the importance of relying on official, credible data. Detailed guidance and anticipation steps for policymakers and the general public have been made available through the official BMKG climate portal.
The next critical checkpoint for climate reliability will occur in May 2026, when the BMKG is expected to release updated predictions with higher confidence levels regarding the intensity and duration of the El Niño phase.
Do you have questions about how the 2026 dry season might affect your region? Share your thoughts in the comments or share this report with your community to help increase awareness.
