LaNina and Indian Monsoon

Context:

The possible emergence of a weak La Nina phenomenon in the equatorial Pacific Ocean in the coming months may be a possible reason behind the late September rainfall and the delayed withdrawal of the monsoon.
La Nina is the cooling phase of the El Nino Southern Oscillation phenomenon in the equatorial Pacific Ocean and generally causes an increase in rainfall over the Indian subcontinent.

To know more about La-nina, please click here.