Mongabay · Climate & nature

Tokyo's Record Rainfall Streak Linked to El Niño and Weather Patterns

Central Tokyo has recorded its longest-ever continuous rainfall streak, lasting 35 days from August 27 to September 30, surpassing the previous record set in 2019.

The prolonged rain is attributed to a stationary autumn rain front, intensified by approaching typhoons and low-pressure troughs. September rainfall in central Tokyo reached 629 millimeters, nearly triple the monthly average and close to the 1958 record.

Meteorological officials suggest that global climate drivers, including the El Niño phenomenon, are contributing to this abnormal weather pattern. An official from the Japan Meteorological Agency (JMA) stated that El Niño is partly responsible for the distinctive weather map observed.

The autumn rain fronts are persisting longer than usual due to a prolonged Pacific high-pressure system over the region. While direct attribution to climate change is difficult, a JMA report indicates that global warming is increasing precipitation in Japan long-term.

Farmers are advised to take extra precautions as rainfall has significantly exceeded average levels in parts of the Kanto region. The continuous rain has also led to unstable hillsides and damaged river levees in neighboring prefectures, increasing the risk of disasters from even minor rainfall.

Officials are urging residents to remain on high alert for potential high waves, strong winds, and landslides.

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