The developing El Niño in the equatorial Pacific, which some climate models suggest could intensify into a rare "Super El Niño" by 2027, is already reshaping seasonal outlooks across the Southern Hemisphere. Sea surface temperatures are running well above average, and the phenomenon, which alters global atmospheric circulation, typically brings excessive rainfall to parts of South America while causing drought elsewhere.

In Argentina, the national meteorological service (SMN) has revised its winter trimester forecast (June-August 2026) to reflect an unusually warm and wet season for much of the country, including Buenos Aires and the key agricultural province of Buenos Aires. Temperatures are expected to exceed historical norms, while precipitation is likely to surpass average levels, a pattern meteorologists in Buenos Aires link directly to the nascent El Niño.

The contrast with Brazil is stark. Analysts tracking the 2026/27 soybean crop warn that strong El Niño events historically reduce Brazilian yields by around 9% while boosting US production by over 120% in the short term. With planting underway in the American Midwest, the immediate outlook favours US farmers, but Brazil's soybean belt faces heightened climate risk, potentially tightening global supplies later in the season.

For global commodity markets, the emerging El Niño injects fresh uncertainty. Soybean prices could come under upward pressure if Brazilian output falters, a scenario that traders in Chicago and Shanghai are beginning to price in. Beyond agriculture, scientists caution that exceptionally strong El Niño events can disrupt rainfall patterns as far afield as India and Australia, affecting everything from rice harvests to hydropower generation. As the Southern Hemisphere winter deepens, governments and agribusinesses are watching the Pacific with unease, recalling the devastating impacts of the 2015-16 Super El Niño.