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Kolkata recorded 1,718.9 mm of rainfall between June 1 and September 30, registering a 28 per cent surplus during the 2026 monsoon season, according to the India Meteorological Department (IMD). The southwest monsoon withdrew from the entire country on Thursday, October 15, while India recorded an overall rainfall deficit of around 13 per cent. In West Bengal, East Midnapore recorded a 48 per cent surplus, followed by West Midnapore at 40 per cent and North 24-Parganas at 29 per cent. In contrast, North Dinajpur, Malda, Jalpaiguri, Dakshin Dinajpur, Darjeeling and Nadia experienced rainfall deficits.
West Bengal received 1,359.9 mm of rainfall during the season, slightly above its long-period average of 1,344.2 mm, calculated using meteorological data from 1971 to 2020. The southwest monsoon arrived in north Bengal on June 9 and reached south Bengal on June 12 before withdrawing from most parts of the state, including Kolkata, on October 12. According to the Met office, 11 weather systems developed over the Bay of Bengal during the monsoon, influencing rainfall patterns across the region. The IMD considers rainfall departures of up to 19 per cent above or below the long-period average to be within the normal range.
