China Declares El Niño State as Korea Braces for a Hot Summer With Ample Rain

East Asia's two major forecast agencies have converged on the same reading of the Pacific: the 2026 El Niño is real, growing, and set to shape the region's weather into next year. China's National Climate Center says the tropical Pacific entered what it terms an El Niño state in May, while the Korea Meteorological Administration has built its summer outlook around the strengthening event.

The National Climate Center, the climate arm of the China Meteorological Administration, confirmed in statements carried by state media that the tropical Pacific crossed into an El Niño state — 厄尔尼诺状态 — in May 2026. Its forecast calls for an event of moderate or stronger intensity forming through the summer and autumn and lasting at least through the end of 2026.

China's grading scale

CMA works from its own formal definitions, which are worth distinguishing from those of other agencies. An El Niño event, in CMA's book, requires the three-month running mean of the Niño 3.4 anomaly to hold at +0.5°C or above for at least five months. Intensity is then graded by the peak: 1.3–2.0°C is moderate, 2.0°C or above is strong, and 2.5°C or above earns the label super-strong (超强).

Against that scale, the NCC's outlook is pointed. Sea surface temperature anomalies of 2°C or more are considered possible in September–October 2026, with a strong event possible around year-end. The centre noted that "multiple major forecast models showed 100% support for strong El Niño conditions," and assessed that the event may rank among the strongest on record — language broadly consistent with what NOAA and European centres have published, as covered in NOAA's July diagnostic discussion.

Notably, CMA has also played referee against hype. In April, as claims of "the strongest El Niño in 140 years" went viral on Chinese social media, the agency publicly urged caution about such framing — a reminder that even forecasters expecting a top-tier event resist superlatives ahead of the data.

Korea: a warm, wet summer signal

South of the Yellow Sea, the Korea Meteorological Administration folded the event into its summer outlook for June–August 2026. KMA expects positive SST anomalies in the tropical central and eastern Pacific to exceed 2 standard deviations during May–July — a statistical way of saying the warming is far outside the normal range.

Closer to home, the agency forecasts above-normal sea surface temperatures in the seas surrounding the peninsula — the East Sea, the Yellow Sea and the East China Sea. For the summer itself, the outlook points to above-normal temperatures nationwide and generally abundant rainfall.

That combination — heat plus ample rain — reflects El Niño's more ambiguous fingerprint at Korea's latitude. Unlike Southeast Asia, where the event's drying influence is robust, the mid-latitude response over the Korean peninsula runs through shifts in the western Pacific subtropical high and the summer monsoon front, which can enhance moisture transport even in a warm-Pacific year. The varied regional responses are part of what makes mapping global impacts an exercise in probabilities rather than certainties.

One event, many yardsticks

The China–Korea picture underlines a theme running through this El Niño: agencies agree on the event while measuring it differently. CMA grades by peak Niño 3.4 on its three-tier scale; Japan's JMA tracks the NINO.3 region; Australia's BOM uses a warming-adjusted relative index; Peru's ENFEN watches the coastal Niño 1+2 region. The indices differ, but through May and into the summer, every one of them moved in the same direction.

For East Asia, the operative horizon is now autumn and winter. If CMA's scenario of anomalies at or above 2°C in September–October verifies, the event would enter the agency's strong category just as the region's cold season begins — historically a setup associated with a warmer winter over much of China and altered storm tracks across the northwest Pacific.