I second the recommendation for protein. You also may want to "seal" your hair. You can search for information, there are a lot of threads about it. Essentially, you use a few drops of oil (my hair doesn't care for straight oil/butter, so I use a really rich product that contains them) and put it in either prior to, or directly after, leave in to seal in the moisture and keep your hair from absorbing moisture from the air.
I leave in Philly, in the summer my glasses fog up when I leave air conditioning, so I know about what you speak, LOL!
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me