Between 9–10 November 2015, Neyveli received 483 mm (19.0 in) of rainfall; rains continued to lash Cuddalore, Chidambaram andChennai. Continuing rains led to low-lying parts of Chennai becoming inundated by 13 November, resulting in the evacuation of over 1000 people from their homes. The flooding in Chennai city was worsened by years of illegal development and inadequate levels of flood preparedness. Much of the city remained flooded on 17 November, though rainfall had largely ceased. Chennai received 1,049 mm (41.3 in) of rainfall in November, the highest recorded since November 1918 when 1,088 mm (42.8 in) in of rainfall was recorded. The flooding in Chennai city was described as the worst in a century. The continued rains led to schools and colleges remaining closed across Puducherry and Chennai, Kancheepuram and Tiruvallur districts in Tamil Nadu and fishermen were warned against sailing because of high waters and rough seas.
during the month of November, Chennai recorded a whopping 1218.6 mm of rain – three times its monthly rainfall. The normal rainfall figures for November stand at 407.4 mm. On the first day of December itself, Chennai recorded 374 mm and the forecast for the week says heavy rainfall will continue.