Ysgo Ysgo Ysgo Ysgo.... check the tides... dries super fast - it can be raining a couple of miles inland but be dry on the coast.
You could try Moel y Gest near Porthmadog, should only be about 20 minutes drive from Pwllheli. Caveat is i have never been and have no idea if it will be seeping after all this rain.See below for the free topo from NWB:http://www.northwalesbouldering.com/upload/members/Moel%20y%20Gest%20topo2.pdf