Key Facts
• July 9, 2025: Dangerous heat expected across many areas, with highs above 35°C.
• Heatstroke alerts issued for 32 prefectures from Kyushu to Tohoku.
• Sudden weather changes likely due to moist air, causing localized thunderstorms.
• Okinawa and Amami to experience persistent heavy rain and thunderstorms.
• Hokkaido to see dry heat with temperatures nearing 30°C inland.
Summary
On July 9, 2025, much of Japan will face extreme heat, with 32 prefectures under heatstroke alerts. Temperatures are expected to exceed 35°C in many areas, particularly in western and eastern Japan. Sudden weather changes, including localized thunderstorms, are anticipated due to unstable atmospheric conditions. Okinawa and Amami will experience continuous heavy rain and thunderstorms, potentially causing road flooding. Meanwhile, Hokkaido will enjoy dry heat with clear skies, though inland areas may see temperatures near 30°C. Residents are advised to stay hydrated, avoid prolonged outdoor activities, and monitor weather updates for safety.
