Cloud-free timing: Cloudy early, clearing later.
A mixed day on Beinn an Eoin: summit wind broadly 15-30 mph, with gusts 30-40 mph during the morning (strong winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Any cloud sits well above the tops (base 800-1600 m) - clear summits. Little or no rain expected.