Well, in terms of unpredictable weather, yes it's definitely October. We have had some really beautiful sunny days and some seriously grim rainy ones. Sunday when I was at a show we had a bit of both - clear skies and sunshine one minute, dark clouds and heavy rain showers the next, one of which happened while I was doing my showjumping round! But in terms of temperatures it's not that Octoberish yet, it's been mild on the nice days and humid on the wet ones, although I did FEEL cold when I got back after my week in Portugal!
I was in a T-shirt when I took Mouse for a walk this afternoon. Now darkness has fallen the temperature has dropped very fast.