We have found www.theyr.net
to be a superb forecast service. It does take a few minutes to get it set up to your home port and another few minutes to learn obout the features.
It's still free.
We have ours set up with Galway as our main port and the default view set to wind conditions.
We have found that it give very accurate wind stenghts and directions and sea states down to even discrete parts of Galway Bay and the Aran Islands.
We have been using it now for 2 years and find it more accurate than any other site.