We had a week of temperatures between 26 and 30 last week. That sounds modest, but there was no breeze and the humidity was in the 70s or 80s, and the nights were warm. Mrs Steve and I found it a bit tough to be honest. Three or four years ago we spent time in Granada and Cordoba when the temperature by day reached or exceeded 40C and the night-time low was at least 25C. But the daytime humidity was generally in single numbers. We found it hot but comfortable, as long as we sought shade in the middle part of the day.