I've lived in every major city in TX and visited most of the other ones.
In terms of weather - The Hill Country floods, and there are major roads in Austin that can get flooded out. The road by the original Whole Foods (started in Austin) will and does majorly flood.
And it's HOT most of the year. AC is everywhere, so you only have to deal with the heat for a few moments between your AC house, your AC car, and your AC work/shopping. But most of the time, you don't want to be outside.
White Cali/NYC People
think they're gonna like Austin, but miss CA/NYC quickly. The lower income taxes get eaten up by higher property and sales taxes and lesser social services/infrastructure. That said, transplants can make a grip, but do they put down roots? Not if they can help it.
Austin (Texas, in general) food is usually pretty good and cheap, compared to most other cities - but it's not LA/NYC level levls of good and/or cheap.
It was always funny to hear the transplants yap about how "uncultured"/dumb most Texans are, when you realize they're mostly in White/Asian/Indian tech bubbles, and the only Texans they typically deal with are in a service capacity. They don't even really mix with people that have lived there all of their lives.
That out of the way...
Black People from any place with a lot of Black People - Houston, Dallas, ATL, DC, etc - find Austin to be very WHITE. Painfully white. There was a time when I knew where every Black barbershop was, there were so few options.
But it's like "Liberal" White Racism + 10-25% Redneck racism when they drive out to Georgetown (hell even in Town in Austin can be some BS with Travis County/Austin Police Dept)
Assuming that's racism is not the main issue, there just has never been a large Black population in Austin, as compared to Houston/Dallas, etc. Black women in particular realize that they're gonna have a tough time dating.
Brehs? If you want to taste the rainbow AND you're in shape AND you have your own car and place - like everywhere else on the planet - it's shooting fish in a barrel.
Like most Texas cities - Local Black People and Transplant Black People (even Black people from other TX cities) - don't really cross over too much. You gotta make the effort, and even then there's some latent suspicion. I was never from the 21 or the 23 - not that I cared, but you might run into folks that do care.
In terms of crime and safety - Austin was really safe. Might get your car broken into if you live where the students live, but it's certainly not gun shots every night, tuck your chain, don't drive through certain areas. If you looking for trouble you'll find though.
Even then, whatever you like socially about Austin, you can find in more #'s and more diversity in Dallas or Houston.
You gotta live in Austin during the summer before you move there imo. When it's hot, when the students aren't there, when the night life is kinda dead, when the city is kinda at its "worst" from a tourist perspective.
All that said, I'd move back to any big TX city in a heartbeat, if they'd pay me as much as I get paid in DC.