How is it possible for my hair to be curly on some days and almost completely straight on others?

Humidity will do that.

@filmfann maybe that’s it.

There have just been times that I’ve had my hair done and the stylist will comment on my natural curl, and I can think of a specific time when I was talking about my curl and a stylist looked at me like I was crazy. “Your hair is poker straight, girl.”
I just wonder if many other people have this inconsistency with their own hair. I really thought it was a uniform thing.

When I was younger, my hair was hobbit long. It would curl on some days, and just be wavey on others. It was always connected to humidity or the kind of shampoo I used.

Humidity,baby! Humidity! ;)

Humidity makes your hair get all curly and wavy. I used to hate it, because I wanted straight hair. Now I’m just glad I have any hair at all.

Mine too – it’s the humidity. In winter, it’s often much straighter because of dry indoor heat.

I shave my head so I don’t have that problem but I think its humidity. Only thing that comes to mind really. What else could it be?

Must be. :)