India’s Monsoon Slows as Rainfall Deficit Reaches 28%

India’s southwest monsoon is off to a sluggish start this year, with the country recording a 28% rainfall deficit so far this season due to an unusual atmospheric pattern that has slowed the monsoon’s advance and suppressed widespread rainfall. According to the India Meteorological Department (IMD), the country received 34.3 mm of rainfall between June 4 and June 14, significantly below the normal 47.7 mm for the period. Large parts of central, eastern, and peninsular India are experiencing below-normal rainfall, while only a handful of districts have recorded excess rain. Meteorologists attribute the slowdown not to a lack of moisture but to a rare shift in upper atmospheric circulation. At the center of the disruption is the westerly jet stream, a fast-moving band of air that has shifted unusually far south. This has weakened the upper-level easterly jet, a crucial driverof monsoon circulation across the Indian subcontinent. As a result, weather systems forming over the Bay of Bengal are struggling to move inland. Without a strong steering mechanism, rain-bearing systems remain weak or confined to limited areas instead of spreading moisture deep into the country. The impact is being felt across central India, eastern states, and parts of southern India, where dry spells have become increasingly common during what is typically a period of active monsoon expansion. In contrast, isolated regions in northwest India have experienced brief rainfall due to localized weather disturbances. The current shortfall has surprised meteorologists, as most long-range forecasts issued earlier this year had projected a healthy start to the monsoon, supported by favorable ocean conditions. However, unexpected atmospheric dynamics have altered the outlook. There is, however, cautious optimism for the latter half of June. Weather models suggest that the upper-level easterly jet may strengthen after June 20, potentially restoring the monsoon’s momentum. If that occurs, rain-bearing systems over the Bay of Bengal could once again penetrate deeper into the mainland, helping the monsoon regain lost ground.

For now, forecasters remain closely watchful, as the coming weeks will be crucial in determining whether India’s monsoon recovers or falls further behind schedule—an outcome with significant implications for agriculture, water resources, and the broader economy.