The Kanto region of Japan expects a break in sunny weather starting May 11, 2026, bringing higher humidity and thunderstorm risks [1, 2].
This shift in weather patterns signals an early transition to summer-type conditions, potentially impacting outdoor activities and public health across Tokyo and neighboring prefectures.
Meteorologists said the change is driven by seasonal high-pressure patterns combined with increasing moisture [1]. This combination is expected to raise both humidity and temperatures while creating localized instability. Consequently, residents face an increased risk of lightning, gusty winds, and hail [1, 2].
Inland Kanto is expected to see maximum temperatures close to 30°C on May 11 [2]. Humidity on that day will be higher than on May 10, which is expected to make the air feel muggy [1]. Tokyo is forecasted to reach a maximum temperature of 27°C around the weekend [1].
The risk of severe weather will persist through the following week. On May 13, lightning risk maps show a red-colored area covering more than 50% of the region [1].
Higher temperatures are expected to peak further inland during the middle of the week. In Isesaki, Gunma, temperatures are forecasted to exceed 30°C on May 16 and 17 [1]. Similarly, Maebashi and Kumagaya are expected to see temperatures near 30°C during those same two days [1].
“The Kanto region of Japan expects a break in sunny weather starting May 11, 2026”
The rapid onset of high humidity and temperatures exceeding 30°C in the Kanto region suggests a volatile transition into the summer season. The combination of high moisture and heat increases the probability of sudden, severe thunderstorms, which can disrupt transportation and infrastructure in densely populated areas like Tokyo.
