Indicas can perform fine in humid conditions
there are Afghan heirlooms run in Hawaii
Green has a report of a pure Chitrali landrace go with zero mold in the Hawaiian
recent reports of a Syrian that did fine on an island in the New England coast
there are lines like Friesland etc. etc.
also, all Himalayan landraces handle damp fine, though they're more 'Sativa' in morphology
bottom line, if you're working from scratch, just start with a sufficiently biodiverse population, with plenty of adaptive variation