Shendm, regarding the heat, it’s subject to the prevailing coastal wind so if it’s a easterly (Levante) it’s hotter than normal, if it’s a westerly (Poniente) it’s cooler than normal (it’s the opposite on the Malaga coast), so there’s no way of knowing much in advance. The game against Las Palmas was early and a bigger risk but by luck it was OK, while the game against Malaga was during a Levante and hence the unbearable heat.
Here there’s no rain from May to Sept and usually none in Autumn, it just gradually gets cooler as the days get shorter. So it can be unbearable until first week of November.
Brian, what’s the worse thing about living in or near to Sevilla?