While the India Meteorological Department (IMD) has issued an orange alert for Monday, indicating heavy to very heavy rainfall at isolated places across the city, heavy showers lashed parts of Mumbai, especially the southern parts, on Saturday night and Sunday. The IMD issued a red alert for Mumbai and other districts of coastal Maharashtra — Thane, Raigad, Palghar, Ratnagiri, and Sindhudurg — on Sunday afternoon, indicating extremely heavy rainfall at isolated places along with thunderstorms, lightning, and gusty winds over 40-59 kmph.
Within 33 hours between 8 am on Saturday and 5.30 pm on Sunday, IMD`s Colaba observatory recorded 214 mm of rainfall. Of this, 120.8 mm was recorded between 8 am on Saturday and 8 am on Sunday, while 93.2 mm was recorded between 8.30 am and 5.30 pm on Sunday.
September rain
The rainfall received by the Colaba observatory in these 33 hours accounts for 45.42 per cent of the annual average rainfall received by the observatory in the past decade. Between 2014 and 2024, the observatory recorded an average rainfall of 469 mm in September while its Santacruz counterpart recorded 557 mm in the same period. The total annual average rainfall for Colaba and Santacruz is 2361 mm and 2916 mm, respectively, according to the BMC`s study for flood preparedness guidelines.
This September, the Colaba and Santacruz observatories have recorded about 488 mm and 531 mm of rainfall, respectively.
On an average, September sees about 19 per cent of the annual rainfall reported in Mumbai.
Monsoon numbers
According to the IMD, so far this year, the Colaba observatory has recorded 102.34 per cent of its annual average rainfall. Against the annual average of 2095 mm, Colaba has already recorded 2144 mm of rainfall.
Meanwhile, the Santacruz observatory has already recorded 130.35 per cent of Mumbai`s annual average rainfall in the same period. Against the annual average rainfall of 2319 mm, Santacruz observatory has recorded 3022.9 mm of rainfall this year.
Forecast for the next three days
Monday: Orange alert, indicating heavy to very heavy rainfall at isolated places, issued for Mumbai and other coastal districts of Maharashtra as well as the Mumbai Metropolitan Region, comprising Navi Mumbai, Thane City, Vasai-Virar, and Mira Bhayander
Tuesday: Yellow alert, indicating heavy rainfall at isolated places, issued for Mumbai and the neighbouring districts of Palghar, Thane, Sindhudurg, Raigad and Ratnagiri
Wednesday: Green alert issued for Mumbai and the districts of Coastal Maharashtra
Areas with highest rainfall between 8.00 am on Sunday till and 5.00 pm on Sunday
– Colaba Fire Station- 103.20 mm
– Dindoshi Fire Station- 102. 40 mm
– Chincholi Fire Station- 100.82 mm
– Borivali Fire Station- 97.20 mm
– Byculla Fire Station- 95.24 mm
– Malvani Fire Station- 95.20 mm
– Magathane Bus Depot- 94.20 mm
– Colaba Pumping Station – 91.19 mm
– Frosberry Reservoir- 84.00 mm
– Powai- 83.80 mm
Overall Rainfall Figures
Colaba- 2025:
Total Rainfall till September 27: 2144 mm
% of annual average rainfall: 102.34%
Annual Average rainfall: 2095 mm
2024:
Total Rainfall till September 27: 2633.6 mm
% of annual average rainfall: 108.74%
Annual Average rainfall: 2095 mm
Santacruz- 2025:
Total Rainfall till September 27: 3022.9 mm
% of annual average rainfall: 130.35%
Annual Average rainfall: 2319 mm
2024:
Total Rainfall till September 27: 3068 mm
% of annual average rainfall: 118.5%
Annual Average rainfall: 2319 mm
