I feel that there is more of the unnatural thing considering the seasonal changes, than the natural. I don't really remember the summer being so hot and obnoxious before.
I know that the people who live in the places where an average temperature can fry an egg if it is left out of a fridge will probably laugh on our summer temperature, but everybody agrees that we are slowly but surely turning into a frying pan.
By the predictions an every next summer is going to be hotter than the previous, and that is a pretty realistic estimation.