Lack of sunlight, like what the Kanto region experienced during its record string of rainy days, can cause seasonal affective disorder.
Tokyo has at long last emerged from a record string of 37 consecutive days of rain, bringing warm and sunny days to a population that endured a scorching summer followed by a deluge of gloom. The run of rain was much more than a nuisance for commuters and a downer for cooped up kids. The Kanto region experienced historically low levels of sunlight in September as the rain continued.
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Tokyo’s record streak of rain comes to an end
japantimes.co.jp
05.10.2026