Monsoons last 90 days. Monsoons pour a lot of heavy rain. Did you know there is such thing as a dry monsoon which is like a drought. It is estimated that there are approximately 500,000 lighting strikes during a monsoon! India experiences the most dramatic monsoons in the world! A monsoon storm can range from a violent thunderstorm to only small dust storms. Monsoon season officially ends on September 30th each year!