In reply to NellWatson:
I've just got back home from doing a few routes at Subluminal. Although there was very little wind there was a very big long swell running today, the only part of Subluminal that was dry was the section around High Street. Most of the Ruckle would have been unclimbable, as would most of the other sea cliffs. The wind strength tomorrow won't be a big problem in itself, but if it drives the swells the cliffs will be very wet.
The sport climbing in the quarries is unaffected by the wind and sea state. Winspit sport offers good shelter from the wind.
There is of course the option of trad climbing at St Aldhems Head, this is way above the sea; sheltered climbing can be found even in fierce South Westerly winds.