I don’t want to be rude, and I completely am all for combating climate change, but 39C is not baking your insides…
I have been deployed to multiple places that were 52C (~125F) in the day/night with high humidity levels, in full long sleeve/pants for 8 hours at a time. 39C (~102F) is hot, but not bake you from the inside type of hot.
Elderly and sick are people not included in what I said above for obvious reasons.