I always think its best to plan your styles around the weather....here in NY the weather runs the gamut so I just plan my styles around that. If its gonna be humid then I'll do a look that I know does great with humidity ie. not straighten. If its gonna be dry and low humidity....if I'm in the mood....I'll wear a sleek straight look....etc.
If I lived in a constantly humid environment I wouldn't bother constantly trying to fight it, that can lead to damage especially if you re-straighten....I'd just wear looks that arent affected by it like twists, braids, twist outs, braid outs, flexi rod sets, straw sets bantu knot outs etc.