Highest Rainfall Over Mumbai & Monsoon Onset Dates

Mumbai recorded very heavy rain of 234.8 till 29th July morning. First heavy spell after the delay of monsoon by 15 days. Southwest monsoon was set over Mumbai on 25th June 2019. Last year in 2018 it was set on 9th June.

The highest rainfall recorded over Mumbai in month of June is 478 mm. The 944 mm is the highest ever recorded in July.

Here are some facts about rainfall during the period of June to September.

The normal date of monsoon over Mumbai is 10th June, but the dates had been fluctuating. In some years the monsoon was delayed considerably while in some years it had been very early.

The extreme rainfall events in Mumbai:


10 June 1991

478 mm

5 July 1974

576 mm

3 Aug 1881

287 mm

10 Sept 1930

548 mm

Santacruz 10 June 1991

399 mm

27 July 2005

944 mm

23 Aug 1997

346 mm

23 Set 1981

318 mm

The average seasonal rain that is rainfall from June to September is:

1) Santacruz is 2265 mm.

2) Colaba is 2025 mm.


Mumbai Monsoon Onset Dates

Here are some statistics for onset dates over Mumbai:

1) Early onset – 29th May in the year 1952, 1956, 1872
2) Late onset  – 25th June in 1962

Below is the chart of monsoon dates over Mumbai for last 67 years till 2018. (Data source: IMD)

(Click the image to see enlarge image)

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