In my cycling days I never shied away from
any weather, because when you're on tour you need to be able to cope with whatever weather you're given.
Not everyone works in an air conditioned office.
The lab where I worked was 40C one summer's day, not surprising really when all the instruments amount to a 1-2kW fan heater running all day long.
There are many things people can do to mitigate the effects of heat for sure.
Like not wearing black clothing in summer.
Some chemotherapy drugs can make the skin more sensitive to sunlight, increasing the risk of sunburn
Amiodarone's like that. Fortunately when I was on it temporarily it was over winter.
It links to an article saying that the writer remembers 1976 and it was magnificent.
In 1976 I went from Kings Cross to York on an Inter City train with broken aircon, and double glazed sealed windows, not the sort of thing you can plan for, or anticipate in advance.
Some years ago mid-summer in Luxor, Egypt I decided I was going to visit Valley of Kings but was not going to take a "tour". And less crowded I decided Valley of Queens first. So I took ferry across the Nile and walked ... past air conditioned tour busses parked beside road with people lying on stretchers .. and it was good (only a few miles from where boat dropped me off). But walking back suddenly realised I'd completely stopped sweating (not a good sign), so slowed my pace a bit and after a bit local motorcyclist stopped to chat and gave me a lift back to a busier road where I thought best take a taxi on to Valley of Kings.
When Levison Wood walked the length of the Nile for his Channel 4 series, his walking companion died of heatstroke.