The effects of the record-breaking heatwave are now spreading to Hokkaido, which is supposed to be relatively cool. In late July 2025, some areas in eastern Hokkaido will experience highs of nearly 40°C, meaning that it is no longer possible to say that "Hokkaido is cool." In this article, we have compiled four ways to prevent heatstroke that even people in Hokkaido who are not used to the heat should know, as well as first aid methods in the event of heatstroke.

Direct sunlight under the blazing sun is a direct cause of heatstroke. According to documents from the Ministry of the Environment, there is a 3-7°C difference in perceived temperature between the shade and the sun. Radiant heat from asphalt (reflected light from the ground) also gradually heats the body. Even just using a hat or parasol can make a big difference, so be sure to avoid the sun when going outside. It is also important to choose thin, breathable clothing.

*Reference: Ministry of the Environment , Ministry of Internal Affairs and Communications, Fire and Disaster Management Agency

Sweating helps lower body temperature, but it also takes away fluids and salt from the body. What's even more frightening is that you don't feel thirsty when you're only slightly dehydrated. Make it a habit to consciously drink fluids before going to a hot place. Don't forget to replenish salt, especially if you've sweated a lot. Sports drinks and salt candy are also effective.

*Reference: Ministry of the Environment

Heatstroke doesn't only happen outdoors; there is a risk of getting heatstroke indoors as well. Infants, the elderly, and people who are in poor health should be especially careful. Recently, air conditioners have been installed in Hokkaido, but if you don't have one, you should try to control the room temperature by using a fan or opening a window for ventilation.

*Reference: Ministry of Internal Affairs and Communications, Fire and Disaster Management Agency

The Ministry of the Environment issues a "heatstroke warning alert" when there is a risk of serious damage to human health. On Wednesday, July 23, 2025, a warning was issued in a wide area 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 to stay indoors as much as possible.

*Reference: Ministry of the Environment

If you suspect that you have heatstroke, take the following steps immediately:

However, if you experience any of the following symptoms, call an ambulance immediately:

*Reference: Ministry of the Environment , Ministry of Internal Affairs and Communications, Fire and Disaster Management Agency

Proper prevention of heat stroke in Hokkaido

Whether you are outdoors for a short time or indoors, there is a good chance of suffering from heatstroke if you are not careful. The first step in preventing heatstroke is for each individual to have the correct knowledge and take precautions on a daily basis. Let's start preparing now so that we can spend this summer safely and securely.

*Image is for illustrative purposes only.