Rain is expected in the Kanto region and southern Tohoku on Friday, May 22, with precipitation likely to stop by the evening [1].
These shifting weather patterns will bring a temporary cooling effect to the capital before a significant temperature spike early next week. This fluctuation requires residents to prepare for both wet conditions and a rapid transition to summer heat.
The precipitation is being driven by northeast winds and a low-pressure system, along with rain clouds that developed over the Hokuriku, Tokai, and Kinki areas [1]. While the Kanto region will see rain on Friday, forecasts for western Japan vary. Some reports indicate rain will arrive on Saturday and Sunday [1], while other sources suggest precipitation could begin as early as Friday [6].
Temperature readings for Friday show a wide variance across the country. Tokyo is expected to reach a maximum of 18°C [1], while Sapporo is forecasted at 21°C [1]. In contrast, Osaka is expected to be warmer with a maximum of 25°C [1].
Tokyo residents should expect temperatures to remain low through Sunday. However, the weather will shift abruptly on Monday, when the city is forecasted to experience heat levels typical of July [1].
Weather teams from TBS NEWS DIG said the current system is responsible for the immediate rain in the east and north [1]. The transition to high heat on Monday marks a sharp end to the cool spell currently affecting the Kanto region.
“Rain is expected in the Kanto region and southern Tohoku on Friday, May 22”
The rapid transition from spring-like temperatures to July-level heat within a single week suggests a volatile atmospheric shift. For urban centers like Tokyo, this volatility can strain energy grids as cooling demands spike suddenly after a period of low temperature.
