This is a sign that things are not normal. Yes these people were older and some sickly but this never used to happen before and as the mercury climbed and the humidity only made things worse people didn't know where to hide.
France and Japan are two examples of countries being exposed to record heat to the point where the latter has declared a state of emergency. This is no longer an anomaly and it has been getting steadily worse since the 1970's. Over 80% of climate scientists now understand that we caused this through our dependance on fossil fuels which increases the level of CO2 in our atmosphere.
There are few places in the world with temperate climates: Iceland comes to mind as well as normally the Mediterranean region where it rarely gets too cold or too hot.
But here, if you are an active person you had better save your outings for early in the morning or for late in the day because you would be foolhardy to do otherwise.
Give me winter over this. At least one can layer.