Key Facts
• Japan Meteorological Agency issued a ‘Significant High Temperature’ alert on July 28.
• Extreme heat expected nationwide (excluding Amami and Okinawa) from August 3 onward.
• Temperatures may exceed 35°C in northern, eastern, and western Japan before August 3.
• Regions like Hokkaido and Tohoku forecast 5-day average temperatures 3.2°C and 2.8°C above normal.
• Heatwave thresholds vary by region, with increases ranging from +1.2°C to +3.2°C.
• High-pressure systems and warm air masses are driving the prolonged heat.
• Japan Meteorological Agency urges heatstroke prevention: hydration and shade during outdoor activities.
Summary
Japan is bracing for a once-in-a-decade heatwave, with extreme temperatures forecast across the country starting August 3, excluding Amami and Okinawa. The Japan Meteorological Agency warns of significant high temperatures, with some regions experiencing 5-day average temperatures up to 3.2°C above normal. Before August 3, northern, eastern, and western Japan may see temperatures exceeding 35°C. The agency attributes the heatwave to high-pressure systems and warm air masses, urging the public to take precautions against heatstroke, such as staying hydrated and seeking shade. This period coincides with the hottest time of the year, amplifying health risks.
