In reply to practicallypixie: The BBC forecast for Froggat looks perfectly climable between 10 am and 7 pm. The forecast for Gogarth (well, Holyhead) suggests a mid-afternoon shower, but otherwise OK; St David's, and hence north Pembroke, likewise.
The will be climbing somewhere, it's just that you might have to dodge a shower. Were it me that was desperate to get out I'd head somewhere quick-drying, which suggests sea cliff limestone. Well, it does to me at least.
Have fun...
T.