Why is my hair so frizzy?

While I had reminded myself that I would be returning to the land of humidity, that was clearly not enough. Leaving the airport was the first shock, wow, it is hot, but more than hot. Why did I leave Greifswald? At nights, one could wear jeans and light jacket (sometimes more was needed) and be extremely comfortable.

Then today, I took a shower, styled my hair per norm, and then a few hours later, realized that what is usually cute curls had turned into a big mess, more frizz than curls! So now my hair is pulled back, which also gets it off my neck. I wonder how long I will keep it long for.