There are many places in South India where the temperature crosses 40 and above during months of Apr-May. For example see temperatures at these places in Karnat

There are many places in South India where the temperature crosses 40 and above during months of Apr-May. For example see temperatures at these places in Karnataka, and AP. https://en.wikipedia.org/wiki/Raichur https://en.wikipedia.org/wiki/Raichur (avg. temperature of 45.0 C in May) https://en.wikipedia.org/wiki/Kurnool https://en.wikipedia.org/wiki/Kurnool (avg. temperature of 46.5 C in May)