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Monsoon Arrival 2025
June 3 , 2025
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- The India Meteorological Department (IMD) under the Ministry of Earth Sciences has retained its April forecast for ‘above normal’ rainfall from June to September.
- It expects the country to see about 92 cm of rainfall (106% of the long period average) during this southwest monsoon season, slightly higher than the 91.3 cm (105% of the average) rainfall.
- It said the southwest monsoon set in over Kerala on May 24, a week ahead of its normal onset.
- Normally, the southwest monsoon marks its onset over Kerala by June 1 and covers the entire country by July 8.
- It starts retreating from northwest India around September 17 and withdraws completely by October 15.
- Not since the monsoon of 2009 has its arrival been this early.
- Since 1975, the earliest monsoon onset over Kerala occurred on May 19, 1990, 13 days ahead of schedule.
- Moreover, the monsoon also advanced to Mumbai early, breaking a 35-year-old record by reaching the city on May 26, two weeks ahead of the norm.
- The IMD officials said that a confluence of factors had played a role in “advancing the monsoon”, including a pre-cyclonic circulation and optimal temperatures in the Tibetan plateau, along with a couple of other global factors.
- The main factor favouring a good monsoon is the absence of an El Nino, which is associated with a warming of the Central Equatorial Pacific Ocean.
- It is also associated with weak monsoon rainfall about 60% of the years when it is in effect.
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