New Delhi Summer Trip -- weather & vaccination

This summer I'll be in New Delhi from June to July.

I've done a bit of research and I believe I have the general guidelines for my trip. However, would be great if i could have some information on what to expect in terms of lifestyle, weather in the summer time, etc from people who visited New Delhi and/or are living in New Delhi at the moment.

I'd also appreciate if you could give me some advice on what vaccination I should get done before the trip.

Thanks ever so much!

Anca