The meteorological office has forecast heavy rain in Chennai and "very heavy rainfall" in coastal Tamil Nadu. Schools and colleges in Kancheepuram, Tiruvallur and Puducherry are also closed today.
"Chennai is ready to face heavy rain. Storm water drains have been cleaned and some 300 chronic water stagnation points have been identified. We have readied 400 suction pumps to remove water during heavy rain," Dr D Karthikeyan, Chennai Municipal Corporation Commissioner, said.
Rainwater has accumulated at several areas on the outskirts of Chennai, say residents who had to wade through knee-deep water outside their homes. The areas where water has not receded include Velacherry, Perambur and Kolathur.
Residents have pointed out that many locations in the city don't have storm water drains to quickly flush out water during a long downpour. The Chennai municipal agency has said storm water drains are being built in extension areas.
Many of these extension areas came under the Chennai Corporation only a few years ago. Most of these were once illegal constructions built upon encroached lakes and water bodies, but regularised by the state government over the years.
In the northern parts of Chennai, water had accumulated on the road and some ground-floor homes in several areas including Kilpauk and Koyambedu. A tree that fell in Mambalam area blocked traffic, close to the commercial hub of T Nagar.
In December 2015, Chennai was flooded after the heaviest rainfall in over a century, paralysing the airport and flooding factories in the state that is home to nearly 70 million people. At least 150 people died that year because of heavy rain.
Puducherry and its suburbs were also lashed by heavy rain yesterday. Traffic in the Union Territory also came to a crawl as in Chennai.