NEW DELHI / THIRUVANANTHAPURAM — The India Meteorological Department (IMD) officially confirmed that the Southwest Monsoon made landfall over the Kerala coast today, June 4, 2026. Arriving three days later than its typical June 1 onset date, the heavy rain showers have brought much-needed environmental relief to the southern peninsula, triggering a steady transition away from extreme summer heat.
Monsoon Progression Timeline & Regional Estimations
The IMD indicates that the monsoon will advance northward along both the Arabian Sea and Bay of Bengal arms. The anticipated timeline for key regions across India is outlined below:
| Region / State | Expected Arrival Window (2026) | Historical Normal Date |
| Kerala & Northeast India | June 4 (Achieved) | June 1 |
| Karnataka, Andhra Pradesh, Tamil Nadu | June 8 – June 12 | June 5 |
| Maharashtra (Mumbai) & West Bengal (Kolkata) | June 12 – June 16 | June 11 |
| Central India (MP, Chhattisgarh, Odisha) | June 15 – June 20 | June 15 |
| Northwest India (Delhi, UP, Punjab, Haryana) | June 25 – June 30 | June 27 |
The El Niño Factor and Total Projected Rainfall
While the onset brings immediate relief, the long-range seasonal outlook raises economic concerns. The IMD has downgraded its quantitative forecast, projecting total cumulative seasonal rainfall (June to September) to be 90% of the Long Period Average (LPA), with an error margin of $\pm 4\%$. This officially classifies the 2026 monsoon as “Below-Normal.”
The structural cause behind this deficit is the rapid strengthening of El Niño conditions over the equatorial Pacific Ocean.
- Currently, neutral parameters are quickly transitioning toward a prominent El Niño phase, with a 92% probability of it prevailing through the peak monsoon months of July, August, and September.
- El Niño traditionally warms the central and eastern Pacific waters, disrupting atmospheric wind patterns and suppressing monsoon precipitation over the Indian subcontinent.
Impact on Agriculture and the Core Zone
The spatial distribution of rainfall is projected to be highly uneven this year. The Monsoon Core Zone, which spans the critical, rain-fed agricultural belts of central, western, and northwest India, is anticipated to receive less than 94% of its average rainfall. Conversely, Northeast India is the only zone expected to experience a relatively stable, “Normal” monsoon (94–106% of LPA).
Agricultural experts warn that delayed or insufficient rains in the core zones could delay Kharif crop sowing, add immediate stress to rural economies, and exert upward pressure on domestic food inflation.