Not sure what is happening with Catania airport though.
As I understand it:
Fire in one of the terminal buildings last week which caused problems for a few days.
There were some brush fires adjacent to the perimeter yesterday or day before I think ( not great but not unheard occasionally at a few airports around the world at times).
AFAIK it was open for business as normal today.....the likes of TUI, Wizzair and Ryanair etc operating in and out.
As far as temperatures goes, yep it was definitely hot at the airport yesterday, with the max reported being 45 Celsius but today the maximum reported was 34 Celsius.
HTH.