The India Meteorological Department (IMD) announced on Tuesday, June 2, 2026, that the southwest monsoon is now expected to arrive in Kerala on June 4. This updated timeline follows an earlier acknowledgment from the agency on May 29 that the rainfall was unlikely to meet its initial forecast of May 26. The standard date for the monsoon’s arrival in the state is typically June 1.
Current Outlook and Meteorological Factors
While the timing of the monsoon’s onset is a focal point, weather officials have emphasized that the date of arrival does not necessarily correlate with the total volume of rainfall. There is growing concern regarding the overall quantity of rain this season, as both the IMD and other weather agencies have issued warnings of “below normal” precipitation.
The agency has adjusted its seasonal forecast, now projecting rainfall at 90% of the Long Period Average (LPA), a decrease from the 92% projection issued in April. Should the rainfall drop below this 90% threshold, the IMD officially classifies the season as “deficient.”
Did You Know? The India Meteorological Department has maintained a high track record for its monsoon onset forecasts over the last two decades; between 2005 and 2025, its predictions were accurate within a four-day window in every year except for 2015.
The Impact of El Nino
The transition toward El Nino conditions in the equatorial Pacific is being monitored as a primary factor for the projected decrease in rainfall. The IMD reports that while conditions are currently neutral, they are shifting toward an El Nino pattern. These conditions are expected to remain weak throughout June before potentially strengthening to a moderate or strong intensity by September.
Expert Insight: The distinction between the timing of a monsoon’s onset and its total seasonal output is critical for agricultural and resource planning. A delayed start can create immediate anxiety, but the long-term stakes—defined by the 90% LPA threshold—suggest that the broader economic and environmental impact will depend more on the sustained intensity of the rains throughout the coming months than on the specific day the monsoon begins.
What May Happen Next
In the immediate term, conditions remain favorable for the monsoon to progress into the Lakshadweep Islands, parts of Tamil Nadu, and across various regions of the Arabian Sea and the Bay of Bengal over the next two to three days. As the season progresses, the development of El Nino conditions will likely dictate the moisture levels across the country. If these conditions intensify as expected by September, rainfall could remain suppressed, potentially leading to a classification of deficient rainfall for the year.
Frequently Asked Questions
When is the monsoon now expected to reach Kerala?
The monsoon is expected to advance into Kerala on June 4, 2026.
What is the threshold for “deficient” rainfall?
The IMD classifies a monsoon season as “deficient” if it receives less than 90% of the Long Period Average (LPA) of rainfall.
How does El Nino affect the monsoon?
According to the IMD, the emergence of El Nino conditions typically leads to less rain during the monsoon season in India.
How might your local community prepare for the possibility of a below-normal monsoon season this year?
