Do certain places get hotter than others in the summer?

So I recently learned that Glasgow gets quite a bit more rain than Edinburgh but is less cold in the winter. I didn't think there'd be such a big difference and am wondering if there's a big difference between how hot it is in the summer between different places? I'm based in Edinburgh but am relocating so would like to take this into consideration because last summer was horrible. (I think my thermoregulation is just out of whack, but at least when it's cold we have heaters, there's not enough for the summer)