31st May:

Weather wise, an event full May for Maharashtra...specially for Mumbai and Pune.

1. 26th May, An earliest ever Monsoon setting date for Mumbai. The previous earliest was May to 29th in 1956, , . 

However, this year, we announced a " temporary advance". Now, this has never been termed before anytime. Looking at the initial surge , due to the meandering Low pressure system ( AS 1) over Maharashtra, we coined this term " temporary " as we saw very heavy rainfalls in Mumbai and Interior Maharashtra (Pune Region). 

(all records and figures in previous posts).

Showing a image of our 26th blog post :👇

Rainfall Total of May 2025 (with normal in Brackets)👇

Mumbai:

Mumbai Colaba: 503 mms ( 16mms). ...Record for May beating 218 mms in 1918.

Heaviest 27th 24 hrs fall of 162 mms on 27th May broke the previous May Record of 128 mms in 2000.

Mumbai Scruz: 378 mms ( 18 mms)....Scruz record of 388 mms in 2000 hold good ! 

Mumbai Avg. May month Average Max in 2025 is 33.5c...Day/Night Average 30.0c...Normal Average is 30.5c

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2. Pune:

One of the coolest May on record for Mumbai & Pune....With coldest May Day ever for Pune at 24.8c on 27th...

2025 May Month Max Avg  is 33.2c Normal is 37.3c

Overall day/Night Avg: 25.9c...

May Rains Total:👇

Pune: 240.2 mms ( 30 mms) Record for May beating 182 mm in 1933

Mahabaleshwar: 445 mms ( 67 mms)

Matheran : 551 mms

Guhagarh: 707 mms

Mormugao : 700 mms

Panjim: 637 mms ( 65 mms)

Dabolim : 680 mms

Mapusa: 693 mms

----Cherrapunji : 1437 mms---------------------------------------------------------------------------------------------------------------------

And sure enough, the rains have drastically reduced after 29th.

The days got warmer..as the Monsoon current weakened..

 30th May

Depression BB 2 Location

Well Done IITM..and Prof Mukhopadhyay and his team !

How India’s cutting-edge weather forecast system was built from a lab in Pune

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29th May:

The Depression, BB-2, has crossed into the West Bengal Coast. Will track N/NE.

 

Very heavy rains now will occur in Bangladesh and NE States.

The Axis will move Northwards, As a result>

 30th May - 4th June: 

Mumbai, Pune , Marathwada and Gujarat will see little rainfall. Few Passing showers for Mumbai. 

Hotter days and nights.

Opportunity for completing any pending civil work and water proofing👇

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Current Winds as on 27th with Monsoon Axis:

..From 29th to 7th June.Rains almost to negligible in Mumbai, Pune, Interior Maharashtra, Sambhajinagar and Bharuch.

Axis and winds expected to shift Northwards ..creating a somewhat hiatus in rains 

 The southwest monsoon made its earliest entry into India this year, hitting Kerala on 24th May and rapidly advancing (temporarily) to Mumbai by 26th May, its earliest arrival.

Fueled by a depression over the Arabian Sea, the monsoon brought record-breaking rainfall to Mumbai.

Colaba recorded 472 mm, surpassing the previous May record from 1918 (280 mms), while Santacruz reported 347 mm.

While rainfall will now reduce, intermittent showers and overcast skies are expected.

A trough off the Konkan coast may keep rains active, but the worst seems to be over for now.

Cool Summer Days in Maharashtra ...27th May..Coldest May Day ever in Pune at 24.8°c 

**Mumbai (CLB) 27th Morning 24 hrs rain: 161.9 mms

May total: 456.5 mms. (Departure from Normal: +446.7 mms)...Previous May Month record 280 mms in 1918.

**Mumbai (SCZ) 27th Morning 24 hrs Rain:  144.2 mms

May Total: 342.0 mms (Departure from Normal +329.6 mms)... Previous May Month record 388 mms in 2000.

**Pune may total as yet on 27th:218 mms... Previous  may record 182 mms in 1933

26TH MAY

MONSOON ENTERS INTO MUMBAI AND PUNE AS A "TEMPORARY" CURRENT.

WE TERM "TEMPORARY" AS EVEN AS RAINFALL IS HEAVY, IT IS NOT STABILISED AS PER CRITERIAS. HENCE THERE MAY BE A BRIEF SCALING DOWN IN RAIN INTENESITY FROM 29TH MAY, FOR A WEEK/10 DAYS.

This could well be the earliest Monsoon Date arrival In Mumbai and Pune. 

Previous dearly dates , as per Vagaries' extreme Blog

May 2025 total till date 5.30 pm :  Colaba 435 mms, Santacruz 272 mms
Wettest May ever: Colaba 280 mms ( 1918) , Sanatcruz: 388 mms (2000)

Heaviest 24 hrs fall in May: Colaba 128 mms (2006), This year new record of 144 mms till 5.30 in 9 hrs.

 Santacruz: 191 mms (2000)

26th May ...2025...

Heavy rains lash Central and South Mumbai on 25th Night into 26th Morning....

Rainfall ended 8.30 am Colaba IMD 135 mms, and 105 mms from 8.30 to 11.30 am Monday.

 SantaCruz 33 mm and 55 mms from 8.30 to 11.30 am 

Rainfall in last 12 hrs ended 12 noon 26th>.

Vagaries 97 mms

Monsoon Advancing as a Temporary current into Konkan and Mumbai>>.Temporary as we expect a sort of "Lull" or weak rains from 29th over Mumbai>Currently the AS 1 system is playing around Coastal Maharashtra..pulling up a temporary current.

Mumbai: Slowing down and decrease in rains from Tuesday 27th evening...