June/July is a good time. The extreme heat in India is in April/May

Depends where you plan to go..North India is hot during those months..especially New Delhi, Agra, Rajasthan (Jaipur, Udaipur) etc.. The max temp rises to 110 F or like 47 deg celcius. Be prepared to travel with cotton, water and sun screens and travel in AC coaches (train and buses) and stay at nice hotels…Monsoon hits southern India during that time, so traveling to Bangalore, Kerala, Mumbai is bad too!!
I say the best places to visit that time is HImalayas (Kashmir, Nepal) or foot hills of Himalayas like Kullu Manali, Shimla, etc..I am sorry that I wasn’t of much help here..if you can travel in April or May then would be nice..

october to march is the best time to visit india….and if u want to come to india in june july that should be fine but then be ready monsoon can begin from july 1st week.
all the best for ur trip and welcome to india, u ll love her

Well June July isn’t the peak Hot season but you are right to worry about temperatures that easily pass 110 F.
The Monsoon is a problem if you are travelling mid to south so to avoid those the further north you go the better.
I would have suggested Rajastan but that might be bad cause of the heat, so Kashmir is a good option (there are political and military issues but that’s more at the border shared by India and Pakistan) still worth seeing I’m told.
hope this helps

If you go early enough before the monsoons are really bad, you might be able to take a house boat cruise in the backwaters in the south. I wish I would have done that, but the monsoons made it too dangerous when I was there
:( Even with the monsoons, it was still ‘refreshing’ to see the heavy rains and lightning/thunder storms, as well as getting the Ayurvedic massage (the best time to get this massage is during monsoon)

I think that’s a bad idea, especially seeing that you’re from Ireland, I don’t think you’d find it very enjoyable.

Like some other people have said, if you do go in summer, then you’d want to stick around Himalayas area.

I’ve gone a couple times in January, and I have a horrible time with the heat, lol.

Thanks for the answers everyone, they were really useful. The places you’ve all advised me against are the very ones I really want to visit so I don’t think I’ll be heading to India this summer, I want to enjoy it properly when I do go. Thanks again!