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Hokkaido Nearing 40°C? A Complete Guide to Heatstroke Prevention and First Aid
The effects of a record-breaking heatwave are spreading to Hokkaido, a region that is supposed to be relatively cool. In late July 2025, some areas in eastern Hokkaido saw temperatures approaching 40°C (104°F), making the old saying "Hokkaido is cool" a thing of the past. This article provides essential heatstroke prevention tips and first aid measures, especially for those in Hokkaido who may not be accustomed to such intense heat.
On July 23, 2025, our staff also experienced temperatures near 40°C in Bihoro Town.
Wear a hat or use a parasol and dress in cool clothing when outdoors
Direct sunlight in scorching heat is a direct cause of heatstroke. According to data from the Ministry of the Environment, there can be a 3 to 7°C difference in perceived temperature between the shade and the sun. Radiant heat from asphalt also gradually heats the body. Using a hat or a parasol can make a significant difference, so be mindful of avoiding direct sunlight when you're out. It's also important to choose light, breathable clothing.
※References: Ministry of the Environment, Fire and Disaster Management Agency, Ministry of Internal Affairs and Communications
Hydrate frequently, even if you don't feel thirsty
Sweating helps cool the body down, but it also depletes water and salt. What's more dangerous is that you may not feel thirsty during mild dehydration. Make it a habit to drink fluids consciously before heading into a hot environment. Especially when you sweat a lot, don't forget to replenish your salt intake. Sports drinks and salt candies are also effective.
※Reference: Ministry of the Environment
Stay vigilant indoors and use air conditioners or fans
Heatstroke doesn't only happen outdoors; there's a risk indoors as well. Infants, the elderly, and those with pre-existing health conditions should be especially cautious. While air conditioner installation has become more common in Hokkaido recently, if you don't have one, try to manage room temperature by using fans and opening windows for ventilation.
※Reference: Fire and Disaster Management Agency, Ministry of Internal Affairs and Communications
Refrain from going outside when a "Heatstroke Alert" is issued
The "Heatstroke Alert" issued by the Ministry of the Environment is announced when there is a risk of serious harm to human health. On Wednesday, July 23, 2025, alerts were issued for wide areas of Hokkaido, including Ishikari, Sorachi, Shiribeshi, Abashiri, Kitami, Monbetsu, Kushiro, Nemuro, and Tokachi. On days when an alert is issued, it is recommended to avoid unnecessary outings and stay indoors as much as possible.
※Reference: Ministry of the Environment
Just in case: First aid for heatstroke
If you suspect someone has heatstroke, take the following steps immediately.
・Move to a cool place or into the shade
・Loosen clothing and have the person rest
・Cool the body with an air conditioner, fan, or by fanning (cool major blood vessels at the neck, armpits, and groin)
・If the person is conscious and able to drink, give them small sips of water
However, if you observe the following symptoms, call for an ambulance immediately.
・The person is disoriented or unconscious
・The person is having convulsions
・The person cannot walk in a straight line
・The person's response to questions is strange
※References: Ministry of the Environment, Fire and Disaster Management Agency, Ministry of Internal Affairs and Communications
Practice proper heatstroke prevention, even in Hokkaido
Whether you're outdoors for a short time or staying indoors, there is always a risk of heatstroke if you're not careful. The first step to prevention is for everyone to have the correct knowledge and take daily precautions. Let's prepare now to ensure a safe and secure summer this year.
※Images are for illustrative purposes only.
