Question

why does india get most of its rain from June to September

Answer 1

I hope you are aware why summer and winter happens. In short, starting from March, the northern hemisphere is inclined towards the sun. This causes summer season.

We have a desert region called Thar to the northwest of India. Temperatures here exceed 45 degrees in summer. This heat builds up and eventually creates a low pressure area over here. This low pressure area isn't localised, its a very broad one.

At the same time, a high pressure system forms over the southern Indian Ocean.

Its standard physics that air moves from high pressure area to low pressure area to fill the gap. The air moves from the high pressure system over south Indian Ocean to the low pressure area over That desert.



Sorry for such a rough sketch! :P

While these winds move over the Indian Ocean, they pick up large amount of moisture. This precipitates as rainfall over India and adjoining countries.

The situation reverses in September, as the northern hemisphere is inclined away from the sun. Thr winds rush back towards the southern Indian Ocean.

Answer 2

India get most of the rain in june and september because of the indian summer monsoon