The downpour led to water-logging in parts of south and central Mumbai as well as eastern and western suburbs, leading to major traffic jams in the morning peak hour.
Traffic crawled at a snail's pace on major thoroughfares like Eastern Express and Western Express highways and major north-south roads, delaying tens of thousands.
Suburban train services on western railway, central railway and harbour line ran 15-30 minutes late. The central railway was hit due to flooded tracks near Sion-Kurla. The cascading effect affected the other two lines.
Though there were no diversions or cancellations, there were three go-arounds and consequent delays, airport officials said.
Besides Mumbai, the adjoining districts of Thane, Palghar and Raigad were also lashed by heavy rains, slowing traffic on all major routes linking Mumbai with Ahmedabad, Pune, Nashik and Goa.
Residents of Mumbai took to social media to describe scenes around them.
I Miss The Times We Could Bunk School Due To #mumbairains. Now They Just Cut Your Pay :/— Rohan (@ApteStyle) August 5, 2016
The IMD has forecast very heavy rains in Mumbai and coastal Konkan region over the next 48 hours.
As a precaution, all major services like the police, fire brigade, National Disaster Response Force or NDRF and others are in a state of high alert.