First sign of the coming autumn

We were walking home from town earlier on this afternoon and I saw this on a tree. I cannot identify the tree, you tell me if you know, but it had three leaves that had indubitably changed colours, and not in a small way. It cannot be the drought, as we had our fair share of rain these last few weeks. The weather, apart from a few hot days, has been warm or cool overall. So I think these red leaves are the first sign of the autumn to come. Not so long to wait now.