Hokkaido Heatwave: Health Alerts Issued as Temperatures Soar

Hokkaido, Japan’s northernmost island, experienced sweltering heat on Wednesday, with several towns reaching record-breaking temperatures. The Japan Meteorological Agency (JMA) reported that eight towns and one city on the island recorded their highest temperatures since official data collection began in 1977.

Bihoro town registered the highest temperature on Hokkaido, reaching a scorching 38.2 degrees Celsius on Wednesday afternoon. This intense heat prompted authorities to issue widespread heat stroke alerts across Japan.

“We are urging residents to remain vigilant against heat stroke through our official website and social media messaging app,” Ryo Nakachi, a government official in the neighboring city of Kitami, told Agence France-Presse.

Kitami has opened a “cooling shelter” for its residents. Many of these individuals lack air conditioning in their homes and sought respite from the extreme heat.

According to a JMA meteorologist stationed in Hokkaido, the high temperatures were attributed to clear skies, the influence of warm air flowing from china, and warm, dry downslope winds.

the Japanese Ministry of the Environment issued a heat stroke alert for a important portion of the archipelago, including half of Hokkaido, highlighting the widespread nature of the heatwave.

The current extreme temperatures follow Japan’s hottest June on record. Climate change is increasingly being linked to severe heatwaves that are affecting regions globally.

The JMA noted earlier this month that strong high-pressure systems persisted in the region during June,leading to an average monthly temperature that was 2.34 degrees Celsius above the standard value. Last year’s summer in Japan was the joint hottest on record, matching the intensity of 2023, and was followed by the warmest autumn in 126 years of record-keeping.

Understanding Heat Stroke

Heat stroke is a severe medical condition caused by prolonged exposure to or physical exertion in high temperatures. Symptoms include a high body temperature, altered mental state or behavior, and hot, dry skin or profuse sweating.If you suspect heat stroke, seek immediate medical attention.

To prevent heat-related illnesses, it’s advised to stay hydrated, avoid strenuous activity during the hottest parts of the day, and seek cool environments. Wearing lightweight and light-colored clothing can also help.

Frequently Asked Questions

• What was the highest temperature recorded in Hokkaido on Wednesday?

  The highest temperature recorded in Hokkaido on Wednesday was 38.2 degrees Celsius in Bihoro town.

• When did Hokkaido last experience such high temperatures?

  Eight towns and one city on Hokkaido recorded their highest temperatures since official data became available in 1977.

• What caused the high temperatures in Hokkaido?

  The high temperatures were caused by clear skies, warm air flows from China, and warm, dry down-slope winds.

• What measures are being taken due to the heat?

  Authorities have issued heat stroke alerts, and cities like Kitami have opened cooling shelters for residents.

• Has Japan experienced extreme heat recently?

  Yes, Japan experienced its hottest June on record, and last year’s summer was the joint hottest on record.

• What is the record high temperature for Hokkaido?

  The highest temperature ever recorded in Hokkaido is 39.5 degrees Celsius, which occurred in Saroma in May 2019.

• What is the connection between climate change and heatwaves?

  Climate change is increasingly linked to sweltering heatwaves that are occurring across the globe.

What are your thoughts on the record-breaking heatwaves gripping Japan? Share your experiences and prevention tips in the comments below!

What are the specific symptoms that differentiate heat exhaustion from heatstroke, and why is immediate medical attention crucial for the latter?

Understanding the Current Heatwave in Hokkaido

Hokkaido, typically known for its cool summers, is currently experiencing an unprecedented heatwave. As of July 23, 2025, numerous cities across the prefecture have issued health alerts, urging residents and visitors to take precautions against heatstroke and exhaustion. This surge in temperatures is significantly impacting daily life and raising concerns about public health. the Japan Meteorological Agency (JMA) reports temperatures exceeding 35°C (95°F) in several locations, breaking ancient records. this is notably unusual given Hokkaido’s climate, traditionally a respite from the intense heat seen in other parts of Japan.

Health Risks Associated wiht Extreme Heat

Prolonged exposure to high temperatures can lead to a range of heat-related illnesses. Understanding these risks is crucial for prevention:

Heat Exhaustion: symptoms include heavy sweating, weakness, dizziness, headache, nausea, and muscle cramps.

Heatstroke: A life-threatening condition characterized by a body temperature of 40°C (104°F) or higher, confusion, seizures, and loss of consciousness. Immediate medical attention is vital.

Dehydration: Reduced fluid levels can exacerbate heat exhaustion and increase the risk of heatstroke.

Increased Cardiovascular Strain: The heart works harder to regulate body temperature, potentially leading to complications for individuals with pre-existing heart conditions.

Exacerbation of Chronic Conditions: Existing respiratory and kidney problems can worsen in extreme heat.

Who is Most Vulnerable?

Certain populations are more susceptible to the dangers of a heatwave:

Elderly Individuals: Reduced ability to regulate body temperature.

Young Children: Their bodies overheat more quickly.

People with Chronic Illnesses: Heart disease, respiratory problems, and kidney issues increase vulnerability.

Outdoor Workers: Construction workers, farmers, and delivery personnel are at higher risk due to prolonged sun exposure.

Tourists & Visitors: Unacclimatized to the warmer temperatures. Hokkaido’s appeal as a cool summer destination can lead to underestimation of the heat risk.

Current health Alert Levels & Affected Areas

As of today, July 23, 2025, the following areas are under varying levels of heatwave alerts:

Sapporo: Orange Alert – High risk of heatstroke. Residents are advised to avoid strenuous outdoor activities during peak hours (10:00 AM – 3:00 PM).

Asahikawa: Yellow Alert – Increased caution advised. Stay hydrated and seek shade.

Hakodate: Yellow Alert – Monitor conditions and take preventative measures.

Kushiro: Orange Alert – Similar to Sapporo, with a focus on protecting vulnerable populations.

Furano & Biei: Yellow Alert – While known for their cooler climates, even these areas are experiencing unusually high temperatures.

These alerts are updated regularly by the JMA and local authorities. Stay informed via local news channels and the JMA website (https://www.jma.go.jp/jma/indexe.html).

Practical Tips for Staying Safe During the Hokkaido Heatwave

Protecting yourself and others requires proactive measures. Here’s a breakdown of essential precautions:

1. Hydration is Key: Drink plenty of water throughout the day, even if you don’t feel thirsty. Avoid sugary drinks and alcohol, as they can contribute to dehydration.
2. Seek Shade & Air Conditioning: Spend time in air-conditioned environments whenever possible. If air conditioning isn’t available, seek shade and use fans.
3. Dress Appropriately: Wear light-colored, loose-fitting clothing. A wide-brimmed hat and sunglasses can provide additional protection.
4. Limit Strenuous Activity: Avoid intense physical exertion during the hottest part of the day. If you must be active, take frequent breaks in the shade.
5. Check on Vulnerable individuals: Regularly check on elderly neighbors, family members with chronic illnesses, and young children.
6. Never Leave Children or Pets in Vehicles: Car temperatures can rise to risky levels within minutes,even on moderately warm days.
7. Cooling Measures: Take cool showers or baths, or apply cool, wet cloths to your skin.

Impact on tourism & Outdoor Activities in Hokkaido

The heatwave is impacting Hokkaido’s popular summer tourism season.

Daisetsuzan National Park: Hiking trails are experiencing increased caution advisories. Hikers are urged to carry ample water, check weather forecasts, and inform someone of their plans.(referencing https://www.japan-guide.com/e/e6775.html for park data).

* Lavender Fields of Furano: