Numerous people had stated that the weather in PdL that day was pleasant (in contrast to a few of the earlier days).
Let's have the benefit of four witnesses who were actually in Praia da Luz that day (Thursday), which give a rather different account of the weather that day from your summary above:
Matthew Oldfield"Erm, it wasn't, erm, not specifically, it was
a better day on the Thursday than it was on the Wednesday, because we had rain, and I think it was sort of warmer and
bit more clear, I don't remember the, it may have been a bit cloudy, but I don't remember specifically".
Rachael Oldfield“…probably that the weather had been
a bit better that day and (inaudible) remember when the rest of us were there, we talked about Matt falling off the boat and Russell rescuing him and you know..."
Fiona Payne “And I remember the Thursday was
a bit of a transition day, as I say, you know, with the weather, it just seemed to warm up, it was sunnier, erm, and it was a very pleasant
evening, you know, it was a nice sunny
evening Jane Tanner 4078 “What was the weather like when you were there?”
[SNIPPED]
"I remember I was wearing, because it was cold, I’d got Russell’s big, I’d borrowed one of his, erm, fleeces, so I’d got a big sort of fleece, it probably came down to about here, but then I’d got flip-flops on and cropped trousers, because I’d only got, I didn’t take jeans..."