In fact, mean temp of Karachi is 32 C in June - which is not Low at all.
https://www.timeanddate.com/weather/pakistan/karachi/climate
and 68% percentile high temp is 35 C.
The highest temp on record for Karachi was nearly 48 C - in 1938.
For sure 44 C is not Cool - but also not worth a Guardian article for a place that has a mean temperature of 32 and many days a year above 40 C.
From a personal note - I am writing this as I sit @ 42C and I am not dying. Heck - my laptop probably does though...