What can I do to prevent my hair from getting ruined on my way to work?

I’m relearning how to girl after having had my hair very short for several years. I grew it back out and I like how it looks, but I’m disheartened to find that I look bad throughout the workday because it gets ruined during my commute. It looks very nice after I straighten it at home in the morning, but I take public transportation to work, which includes 20 minutes of walking outdoors. If it’s humid or raining my hair gets frizzy and stringy and I look like a mess by the time I get to work.

Short of bringing my flat iron to work and redoing it when I get in, is there anything I can do about this? Surely this is a problem that womankind has solved, lol.