The picture looks no better for tomorrow with the weather office forecasting heavy to very heavy rainfall for Tamil Nadu, especially over the northern districts of Chennai, Tiruvallur and Kancheepuram.
It also forecast heavy rains for Puducherry.
"The trough of low pressure now lies over Southwest Bay adjoining Sri Lanka off Tamil Nadu," officials at the Regional Meteorological Center (RMC) told PTI.
Under its influence, widespread rains are expected across the state on Wednesday, with the possibility of "scattered heavy to isolated very heavy rainfall over coastal districts," they said.
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A holiday has been declared today for educational institutions in these districts, which have been experiencing heavy downpour, officials said.
In Chennai, office-goers found it tough to make it to their workplaces on time with the incessant rains resulting in water-logging in several areas. Many of them opted to travel by state government buses, suburban train services and Metro Rail.
Most roads were left in a damaged state, with motorists finding it hard to negotiate potholes.
Flight operations also took a hit due to the inclement weather. Airport officials said one flight, which left Colombo this morning, returned.
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Meanwhile, Chennai Collector E Sundaravalli said there
was a possibility of increasing discharge of excess water from Chembarambakkam lake, a key reservoir which addresses city's drinking water requirement, into Adyar river.
With the discharge likely to go up to 7200 cusecs from the present 5000 cusecs, she asked residents living along the banks of Adyar river to move to safer areas.
The combined storage capacity of the four reservoirs addressing Chennai's water needs stood at 9271 mcft as against the full capacity of 11057 mcft. The storage on December 1 last year was 2859 mc ft, Chennai Metro Water Supply and Sewerage Board said.
Parangipettai (Cuddalore) and Marakkanam (Villupuram) received 16 and 15 cm rainfall in the 24 hours ending 0830 hrs today.
Normal life was thrown out of gear in Puducherry which was pounded by rains last night, officials said.
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Meanwhile, the quantum of discharge from Chembarambakkam has been stepped up, with authorities releasing 20,000 cusecs,officials said.
Rail services on the Beach-Tambaram sector also suffered due to severe water-logging.