I have a GSD and am in SoCal. The heat really isn't an issue. But, GSD's don't have a shedding season. They shed ALL year long. So, you're going to need a good animal vacuum and be prepared to enjoy vacuuming.

In terms of GSD's and kids ... GSD's are wonderful dogs. They're great family dogs. But, here's the thing: if you get a puppy, you're going to have to survive that period before you get the wonderful family dog. GSD's are the mouthiest breeds around. I have scars on my hands and forearms from my dog's puppyhood years. I have a working GSD, though ... so a companion GSD may be slightly less trouble.
It's a dog that will require A LOT of time, work, money, and energy. The puppy period will be worse than having a newborn in terms of amount of work. It's also a high energy breed that is intelligent and requires mental challenges.
I'm not saying any of this to deter you - just prepare you.

I LOVE GSD's, am incredibly biased when it comes to them. For me, they're the best dogs ever - no competition. My dog is wonderful with kids (he's 3). I'm not even the least bit worried about having a baby.
However, I can't stress this enough: the puppyhood period is difficult! Many owners, in the GSD rescue where I volunteer, surrender their dogs because they say the dog "bit" their child. Of course, they didn't. It's a mouthy breed in the puppy period ... so if they can nibble on your child, they will. This DOES stop, and is NOT aggression. But not everyone can handle the type of training and re-directing this involves.
Also, a GSD can't be an outdoor dog. They need to be with their pack. They will bond intensely with your family, and they can't be kept outdoors. It's an animal that has to be with you, actively involved with the family.
I'm probably not giving you any incentive to get one, lol. But ... truly, they are wonderful, gentle dogs. Just not in the puppy stage.

They are VERY intelligent, though. They learn quickly, and will be your best friend forever and ever. I honestly don't know what I'd do without Roark ... he's seriously the best dog I've ever had.