Japan Weather Forecast: Severe Heatwave Continues and Typhoon Approaches Okinawa

Extreme heat is expected to persist across much of Japan through the first half of the Obon holiday period, while Okinawa remains under alert for severe weather as Typhoon 13 approaches. According to reports from Weathernews and the Japan Meteorological Agency (JMA) on August 4, 2026, the heatwave will expand across the Tokai region and western Japan, with some areas experiencing temperatures exceeding body temperature and minimums staying above 30 degrees Celsius.

Typhoon 13 Path and Okinawa Weather Alerts

Typhoon 13 is currently moving near the main island of Okinawa toward the East China Sea. Weathernews has issued warnings for stormy weather in Okinawa due to the storm’s proximity. The Japan Meteorological Agency released a simulation on August 4 tracking the potential rain and wind impact of the system through August 14.

While the storm’s primary impact is centered on the southwest, meteorologists are monitoring its influence on the mainland. Weather forecaster Nozomi Takeshita reported via tenki.jp on August 4 that there is a specific need for caution regarding high waves in the Tokai region as a result of the typhoon’s movement.

Extreme Heat Forecast for Tokai and Western Japan

A significant expansion of the extreme heat zone is forecast for August 5. Weathernews reports that while the Kanto region will see a day with significant cloud cover, the areas west of Tokai will face intensifying heat. Specifically, Nagoya and Gifu are expected to experience intense heat starting August 5.

Yahoo! News reports that some regions in Kyushu are facing “tropical nights” where the minimum temperature does not drop below 30 degrees Celsius, coupled with daytime highs that exceed human body temperature. This pattern of extreme heat is projected to continue through the beginning of the Obon holiday break.

Weekly Outlook and Obon Holiday Impact

The JMA weekly forecast covering August 5 to August 11 indicates that the prevailing high-pressure system will keep temperatures elevated across most of the archipelago. The intersection of this heatwave and the trajectory of Typhoon 13 will be the primary drivers of weather volatility during the upcoming holiday period.

Residents in the Tokai and Kyushu regions are advised to monitor the latest updates from the JMA and Weathernews, particularly regarding the risk of heatstroke and coastal hazards associated with the typhoon’s swell.