Oct 9·Science
Follow-up 3h ago4
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Record-strong El Niño peaks at +4.0°C above baseline, winter storms expected
Japan's Meteorological Agency confirmed October 9 that El Niño has reached record strength, with sea surface temperatures +4.0°C above baseline—the highest since 1949—and will persist through Northern Hemisphere winter. The phenomenon is expected to peak around December and may trigger winter storms, particularly from low-pressure systems affecting Japan's Pacific side.
Quick Facts
- El Niño phenomenon reached record intensity
- Sea surface temperatures in equatorial Pacific monitoring region exceeded previous record
- Forecast predicts persistence through Northern Hemisphere winter
- Expected to peak this season
- Linked to global weather anomalies including typhoons and extreme events
Japan's Meteorological Agency announced on October 9, 2026, that the El Niño phenomenon has reached record intensity, with sea surface temperatures in the equatorial Pacific monitoring region off Peru 4.0 degrees Celsius above the 30-year baseline—exceeding the previous record of +3.6°C set in December 1997. The agency forecasts this state will "almost certainly" persist through the Northern Hemisphere winter, with the phenomenon expected to peak this season.
El Niño occurs when sea surface temperatures remain at least 0.5°C above baseline for six months or longer. When temperatures exceed 2°C above baseline—as current forecasts suggest may exceed 3°C this winter—experts term it a "super El Niño." The World Meteorological Organization predicted on October 8 that this event ranks among the strongest since 1950, potentially peaking in December and continuing into February 2027.
The phenomenon has already contributed to global weather anomalies. Japan experienced increased typhoon activity during summer 2026, attributed partly to El Niño. The United Nations agency notes that shifts in tropical Pacific sea temperatures and trade winds trigger worldwide changes in wind patterns, air pressure, and precipitation thousands of miles away, potentially causing droughts, floods, and extreme weather events.
Historical precedent offers mixed guidance. During the previous super El Niño winter (December 2023–February 2024), Japan recorded a warm winter with an average temperature anomaly of +1.27°C—the second-highest on record—but experienced variable conditions. The Japan Sea side saw reduced snowfall overall, yet experienced localized heavy snow during temporary cold air intrusions in mid-to-late December and late January. The Pacific side faced frequent low-pressure systems, including a February 5–6 event that brought 8 centimeters of snow to Tokyo and disrupted transport across the region.
Forecasters expect this coming winter will follow a similar pattern: overall reduced snowfall on the Japan Sea side, but punctuated by temporary southward cold air surges causing localized heavy snow. The Pacific side faces increased risk from south-coast low-pressure systems bringing snow to typically snow-scarce areas. Agricultural sectors are preparing for potential crop disruption from the warm winter conditions.
Why This Matters
Record-strength El Niño with sea surface temperatures 4.0°C above baseline—the highest since 1949—is confirmed to persist through Northern Hemisphere winter and peak around December. This affects global precipitation and wind patterns thousands of miles away, with Japan facing increased low-pressure systems on the Pacific side, localized heavy snow despite overall warmer conditions, disruption to agriculture and transport, and heightened risk of extreme weather events. The previous comparable event in 2023–2024 brought Tokyo 8 cm of snow in February and regional transport disruption.
Timeline & Sources
Jan 1, 1949
WireJapan Meteorological Agency begins official El Niño temperature records
Jan 1, 1950
WireWorld Meteorological Organization begins official El Niño records
Oct 8, 2026
WireWMO predicts El Niño will rank among strongest since 1950
Oct 9, 2026
WireJapan Meteorological Agency announces El Niño has reached record intensity