I think somewhere between 50-55% when it peaked. It was much more humid in the morning hours when the temperature was still reasonable. 80-100% humidity is pretty common around here, but usually the temps stay low enough so it's not too unbearable. People always say "but, it's a dry heat" when talking about out west, but I always suspected that it was still sucky either way. We talk about moving to a warmer climate, and I tell myself I'll get used to it, or that it's just worse here because of sudden swings. I've always been a warm blooded snow shoveler though, so I tell myself lots of things.