The south-west monsoon arrived in Mumbai on Wednesday, the IMD announced as heavy rains lashed the country's financial capital and suburbs since early morning.
Water-logging was reported in some low-lying areas, but the local train services remained unaffected, while routes of some BEST buses run the city civic body's transport wing were diverted.
A high tide of over four metres is expected around noon in the Arabian Sea, the Brihanmumbai Municipal Corporation (BMC) said.
"It's monsoon arrival in Mumbai today," said Dr Jayanta Sarkar, head of the India Meteorological Department's (IMD) Mumbai office.
Several parts of the city and suburbs witnessed heavy rainfall along with thunder in the morning.
According to the IMD, the Colaba observatory (representative of south Mumbai) received 77.4 mm rainfall, while the Santacruz observatory (representative of the suburbs) recorded 59.6 mm downpour in the last 24 hours.
As per the BMC, the island city, eastern suburbs and western suburbs recorded 48.49 mm, 66.99 mm and 48.99 mm rain, respectively, in the 24-hour period ending at 8 am on Wednesday.
A high tide of 4.16 metres is expected at 11.43 am, a BMC official said.
The IMD has predicted cloudy sky with moderate rain/ thundershowers in the city and suburbs. There is also a possibility of heavy to very heavy rainfall at isolated places.
"It's raining in Mumbai, but trains are running," the Central Railway's chief spokesperson, Shivaji Sutar, said.
The IMD on Saturday confirmed the arrival of the southwest monsoon in Maharashtra as it reached Harnai in coastal Ratnagiri district. But, despite favourable conditions, the monsoon's further progress seemed to be slow.
Monsoon arrives in Mumbai, IMD issues alert
A woman wades through a waterlogged street at Parel area in Mumbai after heavy rain on Wednesday PTI
A car is damaged after a society compound wall fell on it at Savarkar Nagar in Thane on Wednesday. PTi
BMC workers install a signboard near a manhole to guide people on a waterlogged road at Parel on Wednesday PTI