There are really two Weymouths. Seaside Weymouth spread along the splendid sandy bay and the cosy intimate Weymouth harbour to the south of it. But I have never found the harbour to live up to expectations as a port of call for cruising yachts.

I had always been hoping for a halfway harbour in crossing Lyme Bay - 45nm from Portland Bill to Dart - too often a tedious plug against a westerly , or a motoring marathon in a calm. Lyme Regis harbour is of limited use only to bilge keelers or other shallow drafters. Local boats do not always make you welcome drying out against the mole.
The two or three offshore moorings are exposed and most unlikely to allow a peaceful night.