Cloud-free timing: Around 67% early, improving to around 100% later.
A wild day on Brandreth: summit wind broadly 15-40 mph, with gusts 40-50 mph during the evening (gale-force winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Any cloud sits well above the tops (base 800-1500 m) - clear summits. Little or no rain expected. Confidence moderate (forecast models agree on the walking impact of the wind) - the summit peak could reasonably be 31-37 mph, so treat the headline as mid-range.