I recommend a kids' shampoo for the rainy season.

I purchased Johnson's Kids Shampoo after searching for a shampoo for my active child's thick, curly hair that gets frizzy in the humid rainy season. It contains argan oil and silk protein, so the hair feels incredibly soft after washing and doesn't get frizzy at all. It lathers well and smells nice, making it the perfect shampoo for the humid, sweaty rainy season. It is milder than adult products, so I use it occasionally, and it makes my hair so soft.