Low Pressure Area Over Southwest Bay Of Bengal: Heavy Rainfall For Chennai
Chennai and its suburbs are likely to receive heavy rainfall for the next 48 hours. The city and its neighbourhood recorded only light rain in the past 24 hours, with both Meenambakkam and Nungambakkam observing less than 1 mm. However, the south coastal parts such as Cuddalore, Karaikal, and Pamban witnessed moderate to heavy showers. Now, moderate to heavy rain is expected all along the coastline, including the capital city Chennai. This could be the first decent spell for the city and suburbs in the month of November.
November is the rainiest month for Chennai, with a normal of 377.3 mm rainfall. Rains have been rather scanty so far. The airport observatory has recorded 42.2 mm of rainfall between 01 and 17 November 2025. The regional observatory at Nungambakkam has measured a meagre 12.8 mm during this period. Over the last five years, both observatories recorded good rainfall, whereas this season has been highly deficient so far. The current spell promises decent showers over the next two days, especially in the next 24 hours. Conditions are building for another prolonged wet spell during the latter half of the week.
Currently, a low-pressure area lies over the Southwest Bay of Bengal and the Sri Lanka region. A feeble north–south trough along the coast is being supplemented by an upper-air cyclonic circulation over the area. The combined influence of these systems will trigger an overcast sky and moderate to heavy rain and thundershowers along the coastline in general, and Chennai in particular. Rain is likely to begin anytime during the day, with its intensity and spread increasing during the evening and night. Moderate rain will continue tomorrow as well. Heavy rainfall is expected south of the city, extending into Tambaram, Puducherry, Cuddalore, and Karaikal. Rain will ease the day after tomorrow; however, this will be only a short breather, as showers are set to return around the approaching weekend. The weekend spell will not be very heavy, and the downpour may pick up again by the middle of next week.
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