I'm a Northern California transplant to Kentucky for about 16 years now. I had never felt any humidity until I moved here. It is a shock at first, but you learn to do the same thing you do on hot days in California (or Oregon, or Arizona or Texas), we use our air conditioners and try and do any physical labor in the mornings during the summer months.
If the humidity is all you're worried about, you'll get a little sticky, but I bet you'll be happier than a pig in mud once you move here. You can't beat this state's friendliness, hospitality, or beauty, IMHO.
Hope you absolutely love it here, and good luck with your trip!