Key Highlights (1950–1975)

• Earliest Arrivals: The earliest monsoon arrivals for this entire 25-year window happened on May 29, recorded in three specific years: 1956, 1962, and 1971. [1]
• The Unique June 21, 1961 Onset: In 1961, the monsoon had a notably delayed arrival on June 21. This date is highly famous in Indian weather history because the monsoon hit both Delhi and Mumbai on the exact same day. 
• 1975 Onset: As the period closed out, the monsoon arrived in Mumbai on June 13, 1975. 
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  #2009 was 24th June
  
  
  
  
  
  
  
  
  
  
  
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Mumbai Record Rains July 2005. See Details here: 

26 July 2005 ..
>1 hour highest rainfall at Mumbai Scz : 190.3 mms (3.30 to 4.30 pm)
>3 hour highest rainfall at Mumbai Scz : 381 mms (2.30 pm to 5.30 pm)
>6 hour highest rainfall at Mumbai Scz : 648.4 mms (2.30 pm to 8.30 pm)