In reply to Milesy:
Its tommorw I have been looking at and comparing, not today (what's the point, I am at work and typing at a keyboard).
'Little if any rain' implies a good chance of no rain and, if any does fall, for it to be a minimum.
The Met Office summit forecast (not the regional one), for a range of peaks in the West Highland tomorrow, all indicated rain from heavy to light but predicted for most of the day (at least when I looked at them this morning.
Given that rain usually accompanies poor vis and clag, that changes my expectations dramatically. I'm not out to bag hills regardless of the weather. I've walked enough in the rain to know that it is largely crap, despite brave faces and manning up.