The winter in Barcelona was milder than in the UK, and no extra scarf or heavy sweaters were necessary. We were only affected by rain briefly. However, Barcelona gets a lot more active during the Summer months particularly around the beaches.
On our final night, we wandered around Barceloneta and Port Vell to see what was going on. It felt a bit more like a holiday resort down there, less Catalonia and more beach and drinks. So we weren't bothered that we'd missed out on anything. A vaguely interesting mall, an aquarium, a cinema complex. Standard holiday filler.
Anyway, that's it, that's Barcelona! All in all, a good trip, but it left our legs a tad exhausted. They've recovered now, thanks for asking.