
yeah, this is just physics. To overly simplify, swamp coolers alone cannot move the indoor climate to a comfortable state if the baseline temperature is above 40 deg C, even if there is 0 water in the air to start with. They can still help in certain climates, but require air conditioning or significant air movement to compensate.
This hugo theme works well: https://jamstackthemes.dev/theme/hugo-lynx/
for a non-self-hosted, but neat alternative: https://weird.one/