Temperatures in central Tokyo have soared to nearly 9C (16F) above the seasonal average, as the extreme heat blanketing the world continues to smash historical norms.

Over the weekend, Japan’s government issued a fresh round of heatstroke warnings, encouraging people to avoid going outside and to check on at-risk neighbors. Japan is particularly vulnerable to extreme heat because it has one of the oldest populations in the world, with almost 30% of its citizens over the age of 65. Along with the very young, or ill, the elderly are typically at higher risk of suffering from heatstroke.