I used to live very near to Minami Urawa. It's not a bad area.
As far as stuff to do locally, apart from going to watch the (pretty successful) Urawa Red Diamonds soccer team, there isn't a lot to talk about. Of course you have all the usual stuff - izakayas, karaoke, golf etc. But don't worry if it sounds boring. You're on the doorstep of Tokyo, which is just a few minutes away on the train, so this is probably where you'll go for most of your fun/sightseeing. Personally I appreciated being able to visit Tokyo easily and conveniently, but then being able to go back to my home in Saitama where the pace of life is a little slower.
The weather is what you'd expect for the area - the year is dominated by a long hot, muggy summer and if you're anything like me, you'll spend a lot of your time sweating like a horse. Personally, I'm not a fan of Japanese summers, which is one of the reasons I now live in Hokkaido. Fall is nice, as the warm weather often lasts for a long time. Winter isn't that cold, but you might notice the chill a little more because most apartments don't have much in the way of heating - not like you're probably used to back home anyway.
If you get posted to a decent school and make friends quickly, I think you'll have a good time.