The death toll from floods in the four Indian states rose to 158, news agencies quoted state authorities as saying on Sunday.
The death toll in three states - Kerala, Karnataka, and Maharashtra - reached 147, Reuters reported on Sunday.
Heavy rain and landslides forced hundreds of thousands of people to take shelter in relief camps, while train services were cancelled in several flood-hit areas.
In the southern state of Kerala, at least 57 people were killed in rain-related incidents while over 165,000 people were in relief camps in the state, Reuters quoted the state authorities as saying on Sunday.
"Several houses are still covered under 10-12 feet deep mud. This is hampering rescue work," state chief minister Pinarayi Vijayan said.
Authorities worried that rescue operations would be hit by thunderstorms and rainfall predicted in some parts of Kerala.
Last year, more than 200 people were killed in Kerala and over five million affected in one of the worst floods in 100 years in the state.
In another southern state of Karnataka, several structures at world heritage site Hampi, an ancient town, were flooded. So far 60 people have died in rain-related incidents, said state chief minister B S Yediyurappa, adding nearly 227,000 people were staying in relief camps.
In the western state of Maharashtra, where the death toll stood at 30, the flood situation was improving, according to state-run All India Radio. However authorities said it would be difficult to restore rail services in some flood-hit areas within the next two weeks.
While Karnataka, Kerala and Maharashtra have been the worst hit this year, several other states including Gujarat, Assam and Bihar have also seen heavy damage due to floods, said the Reuters report.
Meanwhile, an Asian News International, ANI, report on Sunday said at least 11 people have lost their lives in the western state of Gujarat in the last 48 hour as incessant rains wreaked havoc in the state.
Rescue operation to evacuate people to a safer place is underway. So far, around 6,000 people have been moved to safety.
A policeman from the state received praise for his bravery and kindness. He carried two children on his shoulders for over 1.5 kilometres to rescue them from the floodwaters in Kalyanpur village of Morbi district in Gujarat.
Pruthviraj Jadeja, the policeman, braved fierce current floodwaters and strong winds to save the children, and received praise from the State Chief Minister Vijay Rupani who shared the video and lauded the officer on Twitter.
In the northern Indian state of Uttarakhand, due to unrelenting rains, Thal-Munsiyari Road near Banik has been shut on Sunday after boulders and debris blocked the road.
Earlier on Sunday, in another incident, a huge boulder fell on the road and blocked the portion of the national highway-125 between Dharchula and Tawaghat in the state.
Indian authorities on Sunday mounted major rescue and relief efforts as the death toll from monsoon floods which cut off roads in the country's south and west rose to at least 144.
The southern state of Kerala - a popular tourist haven known for its pristine beaches, hill resorts and backwaters - is among the worst hit, with the toll jumping to at least 67 deaths.
"At least 165,000 people have been moved to over 1,318 relief camps spread across 14 districts in the state," a senior Kerala police officer told AFP.
Bad weather and damaged infrastructure were affecting rescue and relief work, he added.
- Anjana Kumar, Web Reporter
A high-level meeting was convened on Sunday morning in the conference hall of the Chief Minister's office to assess the rain calamity and rescue efforts.
Chief Minister of Kerala, Pinarayi Vijayan tweeted a video of the meeting in session.
At 3pm Indian Standard Time (IST), local media reported that the death toll in Kerala had risen to 60 on Sunday, a jump from 23 announced on Friday.
Over 227,000 people were sheltered in relief camps across the state. Flight operations from the Kochi airport resumed on Sunday at noon, two days after it was shut due to inundation of the runway area.
The death toll from floods and landslides in India rose to over 120 on Sunday, as heavy rains hammered several Indian states, leaving a trail of death and destruction. The monsoon fury affected almost all of Kerala's 14 districts.
Reports from the Indian states of Karnataka, Kerala and Maharashtra, show heavy rain and landslides forcing hundreds of thousands to evacuate their homes.
Kerala Chief Minister Pinarayi Vijayan, stated in a tweet on Sunday that the heavy downpour also triggered up to 80 landslides in the state. Rescue operations involving the Indian Navy and disaster response personnel are in full swing, officials said.
Nine bodies have been recovered in the landslide in Malappuram, local media reported. On Saturday, a landslide hit the Nilambur region of Malappuram district, in which reportedly over 40 people are stranded. Transportation has also been seriously affected across the state.
On Sunday early morning, Vijayan said 165,519 were displaced as of August 11 and placed in 1,318 camps set up across Kerala. In Kozhikode alone, 218 camps have been set up and another 186 camps in Wayanad.
Over 5,000 National Disaster Response Force (NDRF) personnel have been deployed the last few days to help in the rescue and relief operations.
The India Meteorological Department (IMD) issued a red alert for eight districts and orange alert for six districts in Kerala on Saturday.
A red alert has been issued for three districts and orange alert for six districts in Kerala for Sunday (August 11).
On Friday (August 9) IMD issued red alert in nine districts of Kerala, predicting heavy downpour. The districts included Dukki, Thrissur, Palakkad, Malappuram, Kozhikode, Wayanad among others.
Train and flight operations
As of August 10 the following trains were cancelled or partially cancelled:
Train no. 12617 ERS-NZM JCO 10/08/2019 is partially cancelled between ERS-MAQ.
Train no. 22476 CBE-HSR JCO 10/08/2019 is partially cancelled between CBE-MAQ.
Train no.16312 KCVL-SGNR JCO 10/08/2019 is cancelled.
The Kochi airport has resumed operations.
Kerala flood in numbers (as of August 10)
Death toll: 57
1,111 camps set up across the state
124,446 rescued and placed in camps
In Kozhikode alone, 218 camps were set up
186 camps set up in Wayanad
194 houses damaged, 2,349 houses partially damaged
- With inputs from agencies