September 2013 was when Raghuram Rajan became the RBI governor and that gave markets a high. However, on the last day of the month, markets retreated 1.7%, taking the 10% gains down to 6.1%, and the 6,000 mark away from the month’s achievements.
The big bad month of October is coming by that’s seen some crazy moves in the past - +17% in 2007, +26% in 2008 etc. The standard deviation is 9.2% from an average -1.5%, so it would be crazy to predict which way this goes purely on historical month-end data.
And for completeness, the Sensex: