The India Meteorological Department has indicated that conditions are becoming favourable for the early arrival of the southwest monsoon over the Andaman Sea by the weekend of May 17, 2026. The development is significant for India’s agricultural planning, reservoir management, and food security outlook, especially amid concerns of below-normal rainfall linked to possible El Niño conditions.
Major Highlights
- On May 12, 2026, the India Meteorological Department announced that favourable atmospheric and oceanic conditions are emerging for the southwest monsoon to advance into the Andaman Sea and the southern Bay of Bengal.
- The expected onset is nearly five to six days earlier than the normal climatological date of May 22 for the Andaman region.
- Meteorologists identified an intensifying low-pressure system over the southwest Bay of Bengal along with associated cyclonic circulation as the primary factors driving the early advancement of the monsoon.
- In 2025, the monsoon had reached the Andaman Sea on May 13, indicating a recent trend of comparatively early monsoon progression in the region.
- According to the IMD’s first-stage Long Range Forecast issued in April 2026, India is expected to receive seasonal rainfall amounting to nearly 92 percent of the Long Period Average between June and September.
- Weather experts attribute the below-normal rainfall outlook to the growing probability of El Niño–Southern Oscillation conditions developing during the May–July 2026 period.
- The IMD clarified that an early arrival of the monsoon in the Andaman Sea does not necessarily guarantee an early onset over the Kerala coast, where the normal monsoon arrival date remains June 1.
- Agricultural planners and state authorities are preparing contingency measures for rain-fed farming regions in central and western India where rainfall deficiency may affect crop productivity.
- The southwest monsoon contributes more than 70 percent of India’s annual rainfall and plays a vital role in reservoir replenishment, groundwater recharge, and the Kharif agricultural season.
- A fresh Western Disturbance is also expected to influence weather conditions in northwest India from May 15 onward and may interact with advancing monsoon systems.
Important Terms
- Southwest Monsoon: The seasonal wind system that brings the majority of annual rainfall to India between June and September.
- Long Period Average (LPA): The average rainfall recorded over a standard 50-year period, used by the IMD as a benchmark for forecasting monsoon performance.
- El Niño–Southern Oscillation (ENSO): A periodic climate pattern involving fluctuations in Pacific Ocean temperatures and atmospheric pressure that significantly affects global weather and monsoon patterns.
