We live about 45 minutes from Chapel Hill. Have to agree with Lena that it is much hotter than 89 most days in the summer. Not to say that it doesn't happen, but we have been having heat indexes of about 110 for the past two weeks. Normal is quite hot and VERY humid. Some days I honestly think I could go swimming in it! ;)
Chapel Hill is a very nice area. Good schools, well-maintained, but it is pretty pricey to live there. It is also a college town in every sense of the word, so if you like that, Chapel Hill will be for you, otherwise, you may want to look at other areas of the Triangle.
I'm glad you asked this now in the middle of summer (my least favorite time of year down here), otherwise I may have said "ahh the heat isn't that bad"...it really is overwhelming though! Hope this helped!