Indonesia has recorded one of its driest Junes in more than three decades, with average rainfall across the archipelago falling to 153 mm—the eighth-lowest figure since 1991 and a level that meteorologists in Jakarta link directly to the strengthening El Niño. The only drier June occurred in 1997, when a powerful El Niño pushed the national average down to 66 mm. By mid-July, the country’s weather agency estimated that 91.45% of its territory was experiencing low rainfall, with the dry conditions spanning most of Sumatra, Java, Bali, Nusa Tenggara, Kalimantan, Sulawesi, and parts of Papua.

The immediate driver is a sustained warming of the equatorial Pacific, with the Nino3.4 index reaching +1.47 and the 30-day Southern Oscillation Index at -27.4—values that have persisted since mid-May and are forecast to culminate in a strong El Niño later this year. Yet the global atmospheric response is far from uniform. In Indonesia, the Madden-Julian Oscillation and equatorial Kelvin and Rossby waves are injecting enough moisture to trigger moderate rains in pockets of Sumatra, Kalimantan, Sulawesi, and northern Papua, even as the broader pattern remains dry. Across the Pacific in Colombia, climate officials note that the Intertropical Convergence Zone, an active tropical wave train, and the Atlantic cyclone season are sustaining above-normal rainfall over the Orinoquía, Amazonía, and parts of the Andean region, with a 60% probability of continued wet conditions through August despite El Niño’s onset.

These divergent signals are shaping distinct risk landscapes. In Brazil, agribusiness lenders and insurers are urging producers to lock in credit lines, review contingency plans, and secure crop insurance before the phenomenon intensifies, with historical patterns pointing to excessive rain in the South and irregular precipitation in the Centre-West and Southeast. Mexico City observers warn of asymmetric threats: northern states face a heightened risk of intense rainfall, flash floods, and winter storms, while the centre and south could see deepening drought and heatwaves, yet federal preparedness remains largely confined to inter-agency statements. In Colombia, the education ministry has instructed schools to update risk-management plans, ensure drinking-water access, and consider adjusting timetables to limit heat exposure, while health authorities have issued early directives to territorial entities.

The next factual milestone is the projected peak of the event. Colombia’s Ideam puts the probability of a “very strong” El Niño at 81% for the October–November window, a timeline that aligns with historical intensification cycles. As the boreal autumn approaches, the interplay between the maturing El Niño and regional atmospheric drivers will determine whether the patchy rainfall observed in July persists or gives way to more widespread drought—making the coming quarterly climate outlooks a critical checkpoint for governments and markets alike.