Residents across Japan are reporting increased dizziness and fatigue following a rapid temperature swing during a rare rainy-season sunny spell [1].
These sudden fluctuations in weather can strain the human body's ability to regulate internal temperature, leading to a spike in clinical visits for those unable to adapt to the volatility.
On June 7, 2026, temperatures jumped significantly from a previous day's high of 21.6 °C [1]. In Morioka, the maximum temperature reached 29.8 °C [1], while central Tokyo hit 27.6 °C [1] and Toyama City recorded 26.1 °C [1]. This created a temperature difference of six °C between the two days [1].
Dr. Kute Kenji, director of Setagaya Internal Medicine & Neurology Clinic, said more people have been complaining of sluggishness, fatigue, and cold-related symptoms over the past week [2]. The combination of high heat followed by sudden cooling can disrupt the autonomic nervous system, a common cause of the reported dizziness.
Medical professionals are urging the public to remain vigilant as the weather remains unstable. The current sunny spell is considered rare for the rainy season, making the physical impact of the heat more pronounced for residents who had adjusted to cooler, wetter conditions.
Meteorologists warn that the stability will be short-lived. Another sharp temperature drop is expected next week, starting around June 14, 2026 [1, 2]. This upcoming shift may further exacerbate symptoms for those already struggling with the recent volatility.
“"More people have been complaining of sluggishness, fatigue, and cold-related symptoms over the past week"”
The reported surge in fatigue and dizziness highlights the physiological stress caused by 'temperature shock,' where the body cannot adapt quickly enough to rapid swings. With another sharp drop forecasted, public health officials are signaling a period of increased vulnerability for elderly populations and those with pre-existing autonomic disorders.
