The Kanto region of Japan expects a rapid rise in temperatures and tropical-night conditions starting July 13 [1].

This shift marks a critical transition for residents as the rainy season ends, bringing a combination of sudden rain and extreme heat that increases the risk of heatstroke.

According to forecasts from the Japan Meteorological Agency, the region will experience hot and humid weather with a chance of limited rain on the morning of July 13 [1]. While morning showers are possible, temperatures in Tokyo are expected to reach 29°C that day [1]. Meteorologists said possible sudden rain showers could occur in the evening [1].

Conditions are expected to intensify on July 14, with Tokyo's temperature forecast to hit 35°C [1]. The heat will be more severe in Kumagaya, Saitama, where the maximum temperature is forecast to reach 38°C on July 14 and 15 [1].

Temperatures will remain high on July 15, with Tokyo reaching 34°C [1]. The heat will persist into the night, creating what are known as tropical nights, where nighttime temperatures do not drop significantly, with forecasts around 26°C for July 15 and 16 [1].

Weather experts said the pattern is driven by an approaching high-pressure ridge that brings strong sunshine [1, 2]. Meanwhile, low-pressure systems continue to cause occasional sudden showers [1, 2]. This volatility creates a challenging environment for urban centers like Tokyo, where the urban heat island effect often exacerbates high temperatures during the summer months.

“Tokyo's temperature forecast to hit 35°C”

The transition from the rainy season to a high-pressure regime often triggers a sharp increase in humidity and temperature in Japan. The forecast of 'tropical nights' is particularly significant because it prevents the human body from recovering from daytime heat, which can lead to cumulative heat exhaustion over several days.