Southwest monsoon hit Kerala on Friday marking the start of the rainy season, four days after its normal onset date.
The India Meteorological Department said Delhi recorded 139 mm of rainfall, the highest one-day rain for August in at least 13 years.
Moderate to heavy showers will continue over Mumbai for next 48 hours.
Schools and colleges in the city and adjoining districts have been closed as a precautionary measure.
After a making a slow progress, the southwest monsoon is expected to gain momentum and advance further into several parts of drought-hit Maharashtra and central India.
There are no plans of creating artificial rain.
The total market valuation of all listed firms at the BSE had first hit Rs 100 trillion level on November 28, 2014.
Telangana Chief Minister K Chandrasekhar Rao announced Rs 10,000 as immediate relief to each flood-hit household in Hyderabad, lashed by incessant rains since last week, besides an assistance of Rs 1 lakh each to those whose houses were completely destroyed and Rs 50,000 for the partially damaged.
The India Meteorological Department (IMD) has forecast 'extremely heavy rains' at a few places in Marathwada, Mumbai and other parts of the coastal Konkan region of Maharashtra in the next 24 hours.
This may rescue pulses, cotton and oilseed sowing; rain revival in the south to take longer
The metropolis also saw two other incidents of wall collapse amid heavy rains since Friday, injuring five persons.
Rain for the central and northwestern parts a concern.
Weather watchers said it can't be known till May whether El Nio will impact the monsoon or not.
A minister said the country had 7% less rain than normal.
After missing its deadline, the monsoon is likely to hit the national capital and parts of north India by the end of the week, a private forecasting agency said on Monday.
Subdued exports remain an area of concern.
The system moved north-northeastwards at 20 kmph in the last six hours and is over west-central Bay of Bengal, 90 km from Gopalpur, 120 km from Puri and 210 km from Paradip, the weather office said in its 11.30 am bulletin.
A red alert has been sounded in three districts of Idukki, Thrissur and Palakkad in Kerala.
What stocks will gain from a normal monsoon?
Flood victims have been fighting for survival and living in temporary shelters nearby railway tracks with lack of food items. They are yet to get any help from the government, reports M I Khan.
Waterlogging was reported from areas like Dadar, Wadala, Worli, Kurla, Chembur, Bandra, Andheri, Kandivili, Vikhroli, Kanjurmarg and Bhandup, among others.
The Army, the National Disaster Response Force, police and the fire force along with the locals began rescue operations on Sunday morning at Koottickal and Kokkayar panchayats where over a dozen people are listed to be missing due to numerous landslides accompanied by heavy downpour since Saturday.
Though the summer is expected to be hotter, global and domestic forecasts point to good rains.
Incessant rains since the wee hours of Friday threw normal life out of gear in Mumbai
India's outdoor practice session had to be cancelled for the second successive day before rain made way for bright sunshine over the Eden Gardens, raising hopes of a full game in the second ODI against Australia, in Kolkata, on Thursday.
Close to half the country is experiencing deficient rains and the shortage for the figure has gone up to 16 per cent.
Flight operations at the Mumbai airport were suspended for nearly half an hour as visibility dropped well below the required 550 meter-mark
In many parts of central and north India, monsoon reaches only in July.
The city's overall air quality index stood at 306 on Friday.
The disaster management department said that the state government has urged the Indian Air Force to send a helicopter for air-dropping of food packets and other relief material in marooned areas.
Heavy rains, coupled with thunderstorm, lashed Mumbai on Tuesday evening, bringing the soaring temperatures down and giving respite to the citizens from the sweltering heat.
The sky turned cloudy around 4:30pm and gusty winds swept the national capital.
This is the fourth year of drought in Marathwada in the past five years. Each of its 8,522 villages have been affected for two consecutive years.
Assocham-Skymet report says untimely rain may reappear in north India.
According to Skymet Weather, the initial surge in the Monsoon rains can be attributed to the transition of El Nino into the neutral phase.
The IMD has predicted heavy rainfall over Karnataka and Kerala for the next few days.
The city's air quality index will fluctuate between the higher end of the "poor" category and the lower end of the "very poor" category, it predicted.
