It's part of the culture where I live, but the heat keeps increasing. 45 in dry heat (unless you work outside) is fine if you get cooler nights to recover, but when you don't get a break, it's lethal. Also aircon helps you but adds significantly to the heat outside in urban areas, causing what feels like a vicious circle. Anyway, where I live aircon is not common and electricity costs are high.
As a child traveling around northern Spain and rural southern France we got caught out and had to stop and wait for a service station to reopen so we could buy petrol. All part of the experience.
I've lived in a few places that would get consecutive 40C+ days. Perfectly fine unless the wind is a strong northerly blowing from the interior. The 37C in Brisbane this year was much less bearable due to the higher humidity: 75% rather than 45%.