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Japan Faces Scorching Heatwave and Potential for Intense Rainfall

Tokyo, Japan – August 24, 2025 – A widespread heatwave continues to grip Japan, with the nation bracing for another day of dangerously high temperatures. Alongside the heat,authorities are also warning of localized heavy rainfall and potential for severe weather events in several regions.

The Japan Meteorological Agency reports a strong high-pressure system covering the country is driving the heat. Temperatures are forecast to reach 38 degrees Celsius in Gifu City and cities north of Tokyo, including Maebashi and Kumagaya.Central Tokyo, Kyoto, Nagoya, and Fukushima are expected to see highs of 37 degrees Celsius. Osaka, Fukui, Yokohama, Yamaguchi, and Yonezawa may reach 36 degrees Celsius, while Hiroshima, Takamatsu, Nagano, and Sendai are expected to reach 35 degrees Celsius.

Amid these conditions, heatstroke alerts have been issued for 37 of Japan’s 47 prefectures, spanning from Fukushima to Okinawa. Officials urgently advise residents to utilize air conditioning, stay hydrated with fluids and electrolytes, and take precautions to prevent heatstroke.

Moreover, warm, moist air associated with the high- pressure system is creating atmospheric instability. This means the Kanto-Koshin region, shikoku, and northern Kyushu coudl experience sudden downpours accompanied by thunder. Authorities are urging residents in these areas to remain vigilant for potential landslides, flooding in low-lying areas, and potential swelling of rivers. In addition, potential hazards include lightning strikes and gusty winds.

Region	Forecast temperature (°C)	Alert Status
Gifu City	38	Heatstroke alert
Tokyo (Central)	37	Heatstroke Alert
Kyoto	37	Heatstroke Alert
Osaka	36	Heatstroke Alert

Pro Tip: When spending time outdoors, wear light-colored, loose-fitting clothing and a hat. Seek shade whenever possible.

Did You Know? heatstroke occurs when the body temperature rises rapidly, and the sweating mechanism fails, possibly leading to serious health complications.

Is there a thorough heat action plan in place in your region? What steps can individuals take proactively to mitigate the risks associated with extreme heat?

What specific preparedness measures should residents of Tokyo take, given the forecast of 38°C and high humidity?

Scorching Heat Continues Across Japan on Sunday: expect Rising Temperatures and Extreme Conditions

Current heatwave Conditions in Japan (August 24, 2025)

Japan is bracing for another day of intense heat on Sunday, August 24th, 2025, with temperatures expected to soar across much of the country. this ongoing heatwave, already lasting several weeks, poses significant risks to public health and infrastructure. The Japan Meteorological Agency (JMA) has issued heatstroke alerts for numerous prefectures, urging residents to take extreme precautions. This isn’t just a summer discomfort; itS a serious weather event demanding attention.

Regional Temperature Forecasts – Sunday, August 24th

Here’s a breakdown of expected high temperatures across key regions:

Tokyo: 38°C (100°F) – Expect high humidity, exacerbating the heat index.

Osaka: 37°C (99°F) – Similar conditions to Tokyo, with potential for record-breaking temperatures.

Kyoto: 36°C (97°F) – High temperatures are expected to impact tourism and outdoor activities.

Nagoya: 35°C (95°F) – Continued heat stress warnings are in effect.

Fukuoka: 34°C (93°F) – While slightly cooler than other major cities,the humidity will remain high.

Sapporo: 30°C (86°F) – Even Hokkaido is experiencing unusually high temperatures for this time of year.

These forecasts are subject to change, so staying updated with the latest JMA reports is crucial.Check japan-guide.com for complete weather updates and travel advisories.

Health Risks & Heatstroke Prevention

Prolonged exposure to extreme heat can lead to heat exhaustion and, more seriously, heatstroke. Understanding the symptoms and taking preventative measures is vital.

Symptoms of Heatstroke:

High body temperature (above 40°C / 104°F)

Confusion, disorientation, or altered mental state

Hot, dry skin (or profuse sweating)

Rapid heartbeat

Headache

Nausea and vomiting

Loss of consciousness

Prevention Tips:

1. Stay Hydrated: Drink plenty of water, even if you don’t feel thirsty. Avoid sugary drinks and alcohol.
2. Seek Shade: Limit outdoor activities during peak heat hours (typically 10 AM to 4 PM).
3. Wear Light Clothing: Opt for lose-fitting, light-colored clothing made of breathable fabrics.
4. Use Cooling Devices: Utilize air conditioning, fans, and cooling towels.
5. Take Cool Showers/Baths: regularly cool down your body temperature.
6. Check on Vulnerable Individuals: Elderly peopel, young children, and those with chronic illnesses are particularly susceptible to heatstroke.

Impact on Infrastructure and Daily Life

The intense heat is placing a strain on Japan’s infrastructure. Power grids are facing increased demand due to widespread air conditioning use, raising concerns about potential blackouts.

Power Supply: The Ministry of Economy, Trade and Industry (METI) is urging residents to conserve energy to avoid overloading the power grid.

Transportation: Railway operators are implementing speed restrictions on bullet trains to prevent track buckling. Delays and cancellations are possible.

Agriculture: Farmers are battling crop damage due to the scorching temperatures and lack of rainfall in some areas.

Tourism: Outdoor tourist attractions are experiencing lower visitor numbers as people avoid prolonged exposure to the heat.

Historical Context: Japan’s Heatwaves

Japan has a history of intense summer heat, but recent years have seen a marked increase in the frequency and severity of heatwaves.

2022 Heatwave: In 2022, Japan experienced one of its worst heatwaves on record, with numerous deaths attributed to heatstroke. This event prompted the government to strengthen its heatwave preparedness measures.

Long-Term Trends: Climate change is widely believed to be a contributing factor to the increasing frequency of extreme weather events, including heatwaves, in Japan. Rising global temperatures are exacerbating the problem.

Resources and Further Information

Japan Meteorological Agency (JMA): https://www.jma.go.jp/jma/indexe.html – Official weather forecasts and warnings.

Japan-Guide.com: https://www.japan-guide.com/ – Comprehensive travel and living information,including weather updates.

Ministry of Health,Labor and Welfare: Information on heatstroke prevention and treatment (Japanese language).