Southwest Monsoon Onset: The southwest monsoon is expected to make its onset over Kerala on May 26 this year, according to the India Meteorological Department, potentially arriving earlier than the traditional June 1 schedule.
The monsoon’s arrival over Kerala marks the official beginning of India’s annual rainy season, a weather event that plays a critical role in agriculture, water resources, and the country’s broader economy.
Monsoon May Arrive Earlier Than Usual
The IMD stated that the onset is expected around May 26, although weather conditions could shift the date by up to four days on either side. This means the southwest monsoon could reach Kerala as early as May 22 or as late as May 30, depending on atmospheric and oceanic developments in the coming days.
In 2025, the monsoon arrived over Kerala on May 24, also earlier than the climatological normal.
Meteorologists monitor several indicators before formally declaring the onset, including rainfall distribution, wind patterns, cloud formation, and atmospheric circulation over the Arabian Sea and surrounding regions.
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