Indian authorities say the lives of more than 20 million people have been disrupted by the heavy monsoon rains in Mumbai (Bombay) and surrounding areas.
Meteorologists warn of heavy rain and strong winds in the next 24 hours.
Repairing the damage could cost the city up to $10bn (£5.7bn), a senior Indian official told the BBC.
A third of the city is said to be completely paralysed. Its centre is under water and the local transport system has been badly hit.
Indian officials have also warned that the number of people who have died could soon rise to 1,000, as rescue workers are still trying to recover bodies from flooded areas.
Authorities have urged Mumbai's residents to stay indoors.
Schools have been shut again. The Stock Exchange and some offices are open, but many employees are struggling to get to work.
Despite earlier disruptions, flights are currently taking off from the airport.
There may be a respite from Tuesday, with rain forecast to ease.
Indian Prime Minister Manmohan Singh has offered federal assistance to Maharashtra state, and ordered the army to help communities hit by the floods.
Rescuers elsewhere in Maharashtra state are still finding bodies in landslides.
Thousands have protested on the streets at what they say is slow government response.
The BBC's Zubair Ahmed says there is widespread anger, particularly as animal carcasses and human bodies are floating in the streets, causing fears of epidemics.
Residents complain of power blackouts and a lack of drinking water. In central Mumbai, some citizens say they have been without electricity for five days.
Police are touring affected areas calling through loudspeakers for calm and for residents not to believe rumours. On Thursday, 22 people died in a shantytown in a stampede caused by a false report of a tsunami.
The word 'monsoon' comes from the Arabic for 'season'
Describes seasonal reversals of wind direction
From April heat builds over South Asia, creating low pressure areas
Brings moisture-rich south-west winds in from the ocean
The downpours began last weekend and last Tuesday Mumbai received more than 65cm (26 inches) of rain - the heaviest recorded in India's history, causing havoc in a city known for its inadequate infrastructure.
About half of those killed in Maharashtra have died in Mumbai - drowned, electrocuted or buried in landslides.
The spread of waterborne epidemics remains a major concern. City workers sprayed insecticide to combat malaria.
About 200 medical teams have left Mumbai for affected towns and villages elsewhere in the state, while 30,000 health workers have been deployed in the city.
Meanwhile in the central state of Madhya Pradesh, police say seven people have died and another four are missing presumed dead after floods in the city of Indore.
About 12,000 people were moved to safety as mud-walled houses and old buildings began to collapse.
The city has been hit by 15cm of rain in the past 24 hours.