The Kanto region of Japan will experience a rainy and cool Monday before temperatures rise sharply later this week [1].
This sudden shift in weather patterns requires residents to prepare for two extremes within a few days, moving from late-spring coolness to intense summer heat.
Forecasts indicate that July 6 will remain under rainy-season clouds with widespread cloud cover and likely rainfall, particularly during the morning hours [1, 2]. In Tokyo, the maximum temperature is expected to reach 25°C [1]. An ANNnewsCH weather presenter said this temperature is typical of late May.
The cool weather is attributed to a lingering rainy front that is keeping moisture over the Kanto region on Monday [1]. However, meteorologists expect this front to shift northward later in the week, allowing hot air masses to dominate the region.
Starting July 8, the region is expected to see a sequence of "true summer days" with temperatures exceeding 30°C [1]. The presenter said these high temperatures are expected to continue for several consecutive days.
Inland areas are expected to feel the heat more intensely. Maebashi, located in Gunma Prefecture, is forecast to reach 34°C on July 10 and 11 [1]. The presenter said this heat in Maebashi will approach the threshold of an "extremely hot day."
While some weekly forecasts have suggested a milder period, the primary forecast warns of a rapid transition to severe heat [1]. Residents in Tokyo and surrounding cities are advised to monitor updates as the weather front moves.
“Tokyo will reach 25°C, a temperature typical of late May.”
The rapid transition from a cool, moist rainy season to high-temperature summer days can increase the risk of heat-related illness, as the body has less time to acclimate to the heat. The disparity between coastal Tokyo and inland Maebashi highlights the region's varied geography, where inland basins often experience more extreme temperature spikes.
