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If it's a hard-shell, make sure you get one with pit zips! The humidity won't allow "breathable" rainwear like Gore-Tex. Hard shells work best, but if it's humid, you'll "wet-out", even if cooler. I've found pit-zips are the best feature for rainwear here in the Southeast.
ROCK6
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Absolutely concur! Having some additional, shielded venting/mesh, such as covered vents in the chest and upper back areas might also be useful, in
addition to the pit-zips. Being able to fasten the storm flap
intermittently and NOT to have the usual front zipper fastened also helps venting. The ability to have "open" (venting) sleeve cuffs also useful--tighten/close the cuffs as required. Suggest lightest color compatible with your purposes due to heat and so forth. Conformable hoods also highly useful, and a neck/collar that closes-up tight, independent of the hood, if possible, also highly useful. That's where the upper torso vents and pit-zips really pay off.
If possible, get appropriate rain pants at the same time. Buy some with a waistband that can be cinched tight, or left loose, and always try to use them with a loose waist and suspenders. The loose waist and loose (but cinchable) leg cuffs will let your legs breathe into the jacket, where the vents in the jacket will take care of things. Lengthy side zippers on legs make donning/doffing with footgear worn much easier.