For Newport Harbor winds can be tricky. It can be blowing hard in the harbor and literally be dead outside the jetties. So for outside the harbor look at sites posted by others (wind finders, surf line etc.). For inside the harbor check out:
Balboa Weather Eye - Real Balboa Readings Updated Every 5 Minutes
That's a link to the weather page but go back out to the main page and there are cameras on the bay. And you can check it out visually too.