The answer was in the churchyard

Here we passed a quiet and comfortable night, and took horse about six in the morning. Supposing, after we had ridden nearly an hour, that a little house on the other side was the ferry-house, we went down to the water and called amain; but we could not procure any answer. In the meantime it began to rain hard, though the wind was extremely high. Finding none would come over, we went to a little church which stood near, for shelter.

We had waited about an hour when a woman and girl came into the churchyard, whom I did not mind, supposing they could speak no English. They were following a sheep, which ran close to us. I then asked, “Is not this Baldon Ferry?” The girl answered, “Baldon Ferry! No. The ferry is two miles further.” So we might have called long enough. When we came to Baldon the wind fell, the sky cleared up, the boat came over without delay and soon landed us in Anglesey. On our way to Holyhead, one met and informed us that the packet had sailed the night before. I said, “Perhaps it may carry me for all that.” So we pushed on and came thither in the afternoon. The packet did sail the night before and got more than half sea over. But the wind turning against them and blowing hard, they were glad to get back this afternoon.

I scarcely ever remember so violent a storm as blew all the night long. The wind continued contrary the next day. 

The Journal of John Wesley