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A good blow-dry with cool air at the end is key. After washing, dry your hair normally with the blow dryer, but in the last 30 seconds switch to cool air: it seals the cuticles and reduces frizz. First though, use a hydrating shampoo and conditioner - don't dry your hair out from the start because moisture enters dehydrated hair more easily.
Then apply a serum or light oil to the ends while your hair is still damp, not wet. A flat iron is fine if your hair is already pretty wavy, but if it's already straight you'll just risk damaging it. If you go out in high humidity, an anti-humidity hairspray (or a specific anti-frizz product) helps keep everything in place for a few hours, though nothing's miraculous when the air is very humid.
One last tip: don't touch your hair all day. Every time you handle it you accumulate moisture and make it wavier. I know it's hard, but it really does make a difference.
The real secret is using an anti-humidity product *before* blow-drying, not after. A lightweight spray or serum creates a barrier that keeps moisture out when it's hot, and then when you blow-dry everything seals perfectly. Cold air at the end helps, but if you don't apply protection first it doesn't make much difference.
What nobody mentions is that the type of comb actually makes a real difference: use a wide-tooth one while your hair is still damp, because combing it when it's dry in heat and humidity stresses it out and creates frizz. Plus, if you really have to be out in the heat, a flat iron at medium temperatures (not super high) applied after blow-drying keeps everything in place way better than you'd think, just make sure you use it quickly without lingering too much on the same spots.
Perfectly straight hair in heat and humidity is basically impossible unless you're flat-ironing it every single time - and then you're just wrecking it anyway. Better to aim for hair that stays decent and manageable. The key thing is understanding that moisture gets into the fiber when it's porous, so you need to seal it before you even touch the blow dryer.
Use a shampoo and conditioner that hydrate well (dry, stressed hair absorbs more moisture), then apply a barrier product - could be a serum, spray, or even a light cream - while your hair is still wet. This creates a kind of shield that keeps water out. Blow dry normally, and yeah, that whole cold air thing at the end actually works to lock it all down.
Then during the day, keep a mini anti-frizz spray in your bag for quick touch-ups and you're golden. No need to douse everything, just a couple of spritzes on the spots that curl up the most. Oh, and wear a hat or bandana when you go out if you can - it's not just style, it protects your hair from direct contact with humid air.
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