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Southwest Monsoon Advances Early as India Faces Heatwaves and Heavy Rains

The monsoon has reached the Andaman Sea a week ahead of schedule, while heatwaves persist in multiple states and the Northeast braces for continued heavy rainfall and thunderstorms.

Overview

  • The India Meteorological Department (IMD) confirmed the early onset of the southwest monsoon in the Andaman Sea, Nicobar Islands, and parts of the Bay of Bengal as of May 13, 2025.
  • Heatwave conditions are ongoing in isolated districts of West Bengal, Bihar, Odisha, Uttar Pradesh, and Rajasthan, with forecasts extending through May 17.
  • Heavy to very heavy rainfall, along with thunderstorms and lightning, continues across Northeast India, with Meghalaya experiencing extremely heavy rainfall on May 13.
  • Localized weather alerts include a Yellow Alert for Mumbai and an Orange Alert for Nashik, warning of thunderstorms, gusty winds, and potential waterlogging.
  • An upper-air cyclonic circulation over the Andaman Sea raises the possibility of cyclogenesis in the Bay of Bengal, with further developments expected in the coming days.