In talking about the weather in India consider the mountains, large area, rivers, being surrounded by the sea and the fact that India is located in the tropics. The climate in India varies from tropical monsoon in south to temperate in the north of India.
Some areas can be dry and dusty all year round. But monsoon rains occur in most regions between June and early October. Therefore clothing needs change from region to region due to the weather differences across India.
As the weather changes greatly across the Indian continent, to get more information on weather in India click this link –Indian Weather.