What Clothes To Pack!?

Hey everyone, I'm off to Barcelona in the morning and I'll be flying back on Tuesday, so I'll be there for three nights. What shall I pack? I can only take 10kg of cabin baggage, so it's a bit tight, I was just wondering what I need to pack, I have no idea what the weather will be like.

Any help would be much appreciated.

Thanks,
Xagan

According to Google there's a 0% chance of rain and temperatures between 7-14°C So some regular fall-clothes being:shirt, pullover, jacket.