Hi,
I don't have too much useful information, but as nobody else has answered...
I was there for a week for work in 2003. It was December, the temperatures were around 20C - that's the coldest time of year there, though it was quite pleasant for me. In August, there could be a lot of rain (monsoon season), temperatures in the high 20s, so not too bad. As you're staying with a family, you'll be able to ask them what to see, etc. We had a driver who drove us from hotel to office and waited outside all day for us. He took us on a few excursions the weekend we were there - Mysore was an interesting city - huge palace open to public - it was a 2-3 hour drive and I wouldn't drive anywhere myself there, the roads are busy and chaotic. In Bangalore, we went to a modern shopping centre where shop assistants immediately pounced on us and slapped "Privileged Guest" stickers on us - this encouraged other sales assistants to "assist" very eagerly - I emerged with gifts for all nieces/nephew, all I can remember was an Indian Princess Barbie and a model auto rickshaw. Also, there's a whole street full of "cottage industry" shops, with things like rugs from Kashmir, jewellery and other handicrafts from different parts of India. I ate lunch in the company canteen each day and it was delicious - a lot (most?) Indians are vegetarians, the sauces are great. We went to one good restaurant on M.G. Road, but I've no idea the name of it; apart from that, we ate in the hotel most evenings. I like Indian food here and liked what I had there too - I remember I went for the lamb rogan josh in the restaurant and it was very good. In Mysore, the driver suggested we try the chicken biryani, which was good too. I heeded the dire warnings about eating things from roadside kiosks, so stuck to restaurants which were expensive by Indian standards but cheaper than here. In Bangalore, the only tourist attraction I remember was a large park, which seemed a bit threadbare and tired (that was my impression of a lot of India - the tech boom has only benefited a tiny minority). The Karnataka parliament building was there too, with the slogan across the facade - "Government Work is God's Work". There was an interesting temple - Bull Temple - with a large statue of a bull outside.
That's all I can remember.
ATB.