Key Facts
• August 31, 2025 (Sunday), Nagoya and Gifu forecasted to hit 39°C.
• High-pressure system to expand from western Japan to Tohoku region.
• Tokyo expected to reach 36°C, Sendai 35°C on August 30 (Saturday).
• Warm air masses of +18°C to +21°C moving north to Tohoku.
• Dangerous heat of 39°C predicted in Gunma, Saitama, and Yamanashi.
• Heatwave persists across western and eastern Japan, with brief relief in Kanto and Tohoku.
• Residents advised to take maximum precautions against heatstroke during outdoor activities.
Summary
The final weekend of August 2025 will bring extreme heat across Japan, with temperatures nearing 40°C in some areas. A strengthening high-pressure system will dominate from western Japan to Tohoku, causing widespread sunny conditions. Nagoya and Gifu are forecasted to reach 39°C on Sunday, August 31, while Tokyo and Sendai will experience highs of 36°C and 35°C, respectively, on Saturday, August 30. Warm air masses of +18°C to +21°C will contribute to the intense heat, particularly in regions like Gunma, Saitama, and Yamanashi, where dangerous 39°C temperatures are expected. Residents are urged to implement robust heatstroke prevention measures, especially during outdoor activities.
