In reply to John Noakes:
I'd definitely suggest climbing in the sun and low down. Suidhe Biorach would be my suggestion too. It's single figure temperatures at sea level tomorrow, much like the last couple of days, and a light breeze (20mph or so) so a little bit of shelter would be nice and Suidhe Biorach faces W, so you could get a proper little suntrap effect at the base, even if it's pretty cold at the top.
I was doing moderate physical work outdoors the last couple of days and even when the sun showed its face, I still never took my sweatshirt off and was actually even in a jacket some of the time. I would expect belaying to feel really cold in those kind of conditions. I was exposed to the wind though.
A week or two ago there was already light dustings of snow on top of the Cuillin.