Japan's "Towards Zero Heatstroke" Project shares some timely summer reminders

If you've spent a summer in Japan before, you'll know that the rainy season is the calm before the heat really kicks in. Now, the Japan Meteorological Association's "Towards Zero Heatstroke" Project is reminding people that this transition can be one of the most dangerous times of the year when it comes to heatstroke.

According to the project, the number of people taken to hospital for heatstroke in 2025 jumped by around 2.1 times after the end of the rainy season. Ambulance transports rose from 4,772 cases in the week before the season ended to 10,187 in the following week.

One reason is that the cooler temperatures and rainy weather can reduce the body's ability to cope with sudden heat. This process, known as heat acclimatization, is essentially getting your body used to warmer conditions. It usually takes anywhere from a few days to two weeks and can be encouraged through light exercise, regular walks, or even taking a warm bath, alongside eating well and getting enough sleep.

With another hotter-than-average summer forecast, experts are encouraging people to prepare before the intense heat arrives. Staying hydrated throughout the day, taking breaks, and gradually exposing yourself to warmer conditions could all help lower the risk of heatstroke when summer is in full swing.