I too live in a warm and humid place. My dew points have been over 70ļF for a month. I get humidity induced frizz. This is my first spring and summer CG, so I'm experimenting with solutions (putting some results on Porous and Dew Point over 70ļ?
Some home-made items really help with the frizz and have become my hair holy grails. The ingredients are simple and easy to find.
| 1 Tbs vinegar to 1 cup water. I often use this as my final rinse. It could be working for me because it gets rid of the product build-up I think I'm getting since the dew points have gone up. Whatever makes it work - it works great.
| Extra-virgin olive oil, the kind you eat. Olive and coconut oil can penetrate the hair shaft. I have been smoothing one to 7 centimeter sized puddles into my hair an hour or more before washing. I also have been rubbing olive oil along my more coarse, kinky, and less cooperative hairs that stick up at my crown.
Cooking or massage oil
such as safflower, sunflower, almond / any are worth a try | These oils do not penetrate the cuticle. They do help seal in moisture and add shine. I spread several drops of sunflower or almond oil on my palms when I scrunch out the crunch, smooth down my hair, etc. I have over-applied and ended up with producty frizz. Have not had luck adding any kind of oil to my conditioner, but many do this.
Flax Seed Gel
| I use the recipe from the first page of "No Fail Flax Seed Gel, Finally did it ..." plus 1/2 tsp agave nectar per finished cup. This is the magic serum for me.
It defines my curls, smooths down frizzies, and provides a tiny bit of hold.
Humectants can cause humidity inducted frizz in some people. Humidity, Humectants and Hair | NaturallyCurly.com
is one article. Cutting down on most humectants has helped me, though I still like sweets like agave nectar.
Kathymack (a member here) sells product samples. Maybe you can order a package from her, and try them out before shipping full-sized products.
Some gals signatures say that they just use VO5 (various products) or other common products with great success. Maybe once you know your hair's properties and factor in the humidity, you can easily try what works for others with similar hair.