Hi Cirillo,
Just my 2 cents worth, but.......
Looking at the pattern you have there I'm just wondering if the cement and brick wall heat reflection has something to do with it. I'm not sure what way your sun orientation is, but that's how it appears to me.
As far as the heat goes here in Adelaide we've really gotten off lightly this year as last year it was far hotter and for longer periods of time, also remembering we already had 40 degree days in early October last year.
Santa Ana just loves the heat and to me it's a no brainer for the Adelaide climate.
Cheers,
BB.