Mid July should be decent fishing out of westport, but you really never know. It can be great fishing one day out of westport and dead the next, those fishing are all just moving through, mostly down the coast until later in August when the grays harbor fish show up.
I stick to Neah bay until August, then move down to westport so if you can swing a trip up there, I would put money on you being in fish every day. Mid July should be prime time up there, westport can be totally hit or miss. If you can't make the long trip up to Neah Bay, I wouldn't say it would be a waste of time at all to book a trip or two in westport.
The fishing out of Ilwaco (pacific salmon charters) can be even worse as far as being spotty IMO.