The Brihan Mumbai Municipal Corporation (BMC) has alerted a high tide of 4.70 metres at 1521 hours on Wednesday.
"Any tide above 4.5 metres is coupled with heavy rains and is a matter of concern," Joint Municipal Commissioner S S Shinde said.
Another tide of 4.07 metres is expected at 1421 hours, the civic body said.
"We appeal to Mumbaikars not to venture into the sea and stay away from the coastline area as a high tide has been predicted today," Shinde added.
The civic body had earlier said that the city would witness high tides measuring about 4.70 metres till June 17.
In the month of June, there will be tides from June 13 to 17 measuring between 4.58 m to 4.73 m, the BMC had said.
Heavy rains coupled with strong winds lashed the city and its suburbs on Wednesday, disrupting air and rail traffic and leading to water logging in many areas.
The city received 60.77 mm rainfall since Tuesday. Colaba in south Mumbai received 78.6 mm and suburban Santacruz received 95.0 mm, the MET department said.
On July 26, 2005, the metropolis saw unprecedented floods as 944 mm of rainfall coincided with a 4.48 m tide.