Japan’s Summer Outlook: 60% Chance of El Niño

By Tax assistant

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Japan weather bureau says 60% chance of El Nino in summer

The Japan Meteorological Agency (JMA) has officially shifted its forecast, signaling a 60% probability that the El Niño phenomenon will emerge this summer. After a winter dominated by La Niña, the Pacific is warming up, and the transition could significantly alter Japan’s seasonal patterns.

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The Forecast at a Glance

  • Spring (March–May): A transition phase. There is a 50% chance of moving into “Neutral” conditions as the cold La Niña waters dissipate.
  • Summer (June–August): The odds tip in favor of El Niño, with a 60% likelihood of it becoming the dominant weather driver.

What to Expect This Summer

While El Niño usually means “cooler” summers for Japan, the 2026 climate landscape is a bit more complex. Here is the breakdown:

  • Lingering Rain: The Tsuyu (rainy season) often lasts longer. Expect more overcast days and a potential delay in the “official” start of summer.
  • The Temperature Paradox: Historically, El Niño brings cooler northern temperatures. However, due to ongoing global warming trends, experts warn we may still see intense humidity and heat spikes, rather than a consistently mild summer.
  • Agricultural Watch: Reduced sunlight hours can be a concern for rice farmers in the Tohoku and Hokkaido regions.

Bottom Line: Prepare for a “mercurial” summer—damp, humid, and less predictable than the scorching heatwaves of previous years.

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