*Last year the weather was great you never know. Great time to go IMHO.*
Were you there at the time the OP refers to, or were you there for Jersey Week? Last year, the weather was absolutely appalling during the time the OP refers to. It was unbearably hot and sticky with daily downpours -- exactly the same weather as August.
After we left and Jersey Week began, the weather turned dry and considerably cooler. We noted with disappointment that had we gone later, the weather would have been closer to what we had expected -- low humidity, cooler temperatures and little, if any, rain.
We are worried about going back the same time this year for the F&W Festival because it was so miserable last year. However, we refuse to go during Jersey Week due to the crowds. So, I guess we'll take our chances with the weather.