the suburbs recorded 97.87 per cent of annual normal rainfall, with Colaba observatory recording 2,135 mm rainfall and Santacruz receiving 2,300 mm.
Its speed is now limited to 100-110 kmph, said M Mahapatra, scientist at the Cyclone Warning Division of IMD.
For the second successive day, Katra received more than 20 cm rainfall in 24 hours.
Last year, up to August 31, Colaba had received 2,220 mm rainfall and Santacruz 2,598 mm.
The rain, however, brought with it the perennial problem of water logging in many areas.
Heavy rain also led to five instances of minor ceiling, wall and slab collapses in various parts of Mumbai.
In April last year as well, the radar had been hit with a technical snag for over a month.
The national capital and several parts of North India received widespread rain since Wednesday,
The minimum temperature on Tuesday was recorded at 28.5 degrees, one notch above normal.
The study being carried out is based on rainfall data between 1971 and 2000.
IMD officials say deficient rainfall in June alone does not necessary indicate a bad season.
This year will be only the 12th time in last 113 years when there has been over 30% rainfall deficiency in June.
The minimum temperatures too were high on Tuesday, with Santacruz recording 29.8 degrees Celsius, almost 3.2 degrees above normal, and Colaba recording 28.4 degrees, 1.9 degrees above normal.
In April, the IMD had predicted a below normal monsoon at 95 per cent.
Monsoon normally hits Kerala on June 1 but this year, Met department had predicted that it will hit on June 5.