This past July was the best I have seen since 2009 when I first moved here. There are almost always days with wind, but you have read between the lines. Sometimes, it turns on before dusk and you have to catch it very early, sometimes it turns on just before sunset, sometimes it kicks on for lunch break. It can be too windy, or not windy at all, be 0 mph or kts at Cape Hattie and 20 mph at Jockey's Ridge, and can be 0 mph Avon and 15mph Rodanthe/salvo/waves.
As an instructor here, there were many no-wind days some because of lack of wind, but a lot were because a good oceanside day meant the soundside riding was off shore winds, totally flukey from wind shadows of the dunes or massive rental houses, and just was not condusive for teaching and making learning fun. There were some absolutely no wind days but for the most part, if you are a competent kiter, and are able to kite either flat water or gnarly surf, and will have a vehicle to get you to any of the spots to kite along the ~60+ miles of coast, then you should be set as long as you plan on being around for at least a few days. If you cant handle the waves or drive distances, then you will get skunked for some days. If it is NE, it usually holds for few days no matter the season. Certain SW trends in the summer hold solid for a few days. Most tend to start off in the low teens and build nice through the morning and sometimes crank into the 25-35 range each afternoon. Sometimes you can keep an eye on windalerts human forecasts, kite in the morning down south on hatteras, and if the wind switches to SE, drive on up to Jockey's Ridge and ride there lit even though the meter says it's only 15mph.
Hatteras is a gem, full of great people who want to kite. Some places are being monitored more though these days, Jockey's Ridge was mayhem this summer and parking got way out of control due to tourists and kiters from up North. Also there is some issue with using state roads to access certain waters (illegal unless you are fishing). If you come here for two whole weeks, you will find wind, if you stop by some of the schools, you will find local kiters who have in depth knowledge and possibly a sixth sense about what the weather will have in store.
Wouldn't be a bad idea to bring a big kite too, I've spent many summer days on a 15 or 17 and gone right down to a 9 the next or even the same day.