The Southwest Monsoon officially advanced over Mumbai, 23rd June 2026, bringing widespread rainfall, gusty winds, cloudy skies, and much-needed relief from the prolonged heat and humidity. The onset comes nearly two weeks later than the normal arrival date which is around 10 June, marking one of the delayed monsoon onsets over Mumbai in recent years.
This year, the monsoon made an early onset over Kerala but thereafter witnessed a prolonged pause in its northward advance, especially along the Arabian Sea branch. After crossing Kerala, the progress slowed considerably due to the absence of strong synoptic support over the Arabian Sea and western coast.
In 2025 Monsoon recorded earliest onset over Mumbai on 26th May.
In 2024 Monsoon set over Mumbai on 06th June 2024. In 2023 it was set late on 25th June 2023.
Being the coastal city and due to Sahyadri mountains, Mumbai receives good amount of rainfall over 2000 mm durng monsoon as compared to 500mm over other places in interior Maharashtra.
Here are some facts about rainfall during the period of June to September.
The normal date of monsoon over Mumbai was 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.
Here are some statistics for onset dates over Mumbai:
1) Early onset – 25th May 2025 and then 29th May in the year 1952, 1956, 1872
2) Late onset – 25th June in 1959, 2019, 2023
Monsoon onset dates since 2010:
Year | Onset Date |
2010 | 14th June |
2011 | 5th June |
2012 | 17th June |
2013 | 7th June |
2014 | 15th June |
2015 | 12th June |
2016 | 20th June |
2017 | 12th June |
2018 | 9th June |
2019 | 25th June |
2020 | 14th June |
2021 | 9th June |
2022 | 11th June |
2023 | 25th June |
The average seasonal rain that is rainfall from June to September is:
1) Santacruz is 2265 mm.
2) Colaba is 2025 mm.
The extreme rainfall events in Mumbai:
|
Colaba |
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 |
For detailed rainfall statistics over Mumbai visit: IMD Mumbai website
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