The behavior of the southwest monsoon across India is currently presenting a dual scenario. While the initial phase of September commenced with a worrisome rainfall deficit, the India Meteorological Department (IMD) has forecast a refreshing turn of events with a seven-day period of widespread rainfall expected to cover various regions of the country. During the first week of September, precipitation levels dropped significantly, a trend heavily attributed to the intensifying global climate phenomenon known as El Nino. However, the development of a strong low-pressure area over the Bay of Bengal, combined with an active Western Disturbance, is now poised to bring much-needed respite, initiating a fresh spell of rain across northern, eastern, central, and southern states.
El Nino Shadows and the Mounting September Rain Deficit
According to meteorological observations, the pace of the southwest monsoon has remained notably sluggish during the early days of September. Data reveals that between September 3 and September 9, India experienced a significant 36 percent deficit in rainfall compared to the long-term normal. This sharp drop has widened the cumulative deficit for the entire 2026 monsoon season to 15 percent. The southern peninsula has borne the brunt of this dry spell, recording the most severe shortage of rainfall. Conversely, parts of northern and eastern India managed to maintain a degree of balance by recording steady moderate to heavy rainfall during the same timeframe.
This weak monsoon activity is closely linked to the formidable presence of El Nino. Climatologists globally have raised concerns about the strength of this atmospheric phenomenon this year, noting that it typically drives a rise in average temperatures and causes a marked reduction in monsoon precipitation. Experts warn that a prolonged strong El Nino could trigger agricultural disruptions and potential food insecurity. Sharing insights on social media on September 11, 2026, weather specialist Mahesh Palawat from Skymet Weather pointed out that if rainfall does not recover substantially in the coming days, the widening gap could severely impact agricultural operations, reservoir storage, and the broader Indian economy.
The Indian economy remains highly dependent on the monsoon, given that a significant portion of the country's population relies directly on agriculture for their livelihood. The months from June to September are crucial for the sowing and maturation of Kharif crops such as paddy, pulses, and oilseeds. Consequently, a 36 percent deficit in early September poses a direct threat to crop yields, especially in the southern peninsula. States like Karnataka, Tamil Nadu, and parts of Andhra Pradesh are seeing rapid depletion of soil moisture, raising anxieties among farming communities. Weather specialists pointed out that if these conditions persist, the compounding effect of water scarcity will not only affect agricultural output but also trigger domestic water shortages and limit hydroelectric power generation across key reservoirs.
Multiple Weather Systems Converge Across the Country
In the midst of these challenging conditions, the IMD has offered hope by tracking the simultaneous convergence of several distinct weather systems. A low-pressure area that formed over the northwest Bay of Bengal has been gathering strength. By the morning of Friday, September 11, at 8:30 AM, this system was positioned over the northwest and west-central Bay of Bengal, very close to the coastlines of southern Odisha and northern Andhra Pradesh. Meteorologists expect this system to become even more pronounced and move in a west-northwesterly direction toward northern coastal Andhra Pradesh and southern Odisha over the next 24 hours, triggering heavy rain across these coastal belts.
Additionally, the monsoon trough line is currently well-positioned, stretching from northern Rajasthan down to the low-pressure center hovering over the Bay of Bengal. Another trough is actively running from south interior Karnataka to the Gulf of Mannar. Furthermore, a mid-tropospheric cyclonic circulation is active over the east-central Arabian Sea near south Konkan. Up north, a Western Disturbance is actively influencing the lower and mid-tropospheric levels over northern Punjab and nearby regions. The combined energy of these atmospheric systems is set to revive the monsoon flow and distribute rainfall across multiple states.
The interaction between these diverse meteorological systems is driving rapid changes in atmospheric pressure. The low-pressure system in the Bay of Bengal acts as the primary engine for this monsoon revival. Positioned near the coastlines of southern Odisha and northern Andhra Pradesh as of Friday morning at 8:30 AM, this system is facilitating the heavy influx of moisture-laden winds from the sea onto the mainland. Concurrently, the cyclonic circulation near the Konkan coast over the Arabian Sea is strengthening westerly winds along the western coast. When the Western Disturbance active over northern Punjab interacts with these warm, moisture-heavy monsoonal winds, it creates highly volatile atmospheric conditions, leading to widespread thunderstorms across the northern plains. These combined dynamics ensure that central, eastern, and northern states will witness sustained precipitation over the next week.
Heavy Rain Warnings for Delhi-NCR and Neighboring Plains
The impact of this atmospheric realignment will be felt prominently in the national capital and surrounding areas. The meteorological department has predicted light to moderate rain showers for Delhi, Haryana, and Chandigarh from September 11 through September 17. However, the primary focus is on September 13 and September 14, when isolated pockets in these states are highly likely to experience heavy downpours. The IMD has issued a special advisory urging caution during these two days, as heavy rain could lead to localized waterlogging and disrupt urban transport networks.
Western Uttar Pradesh is also expected to witness similar weather shifts. Widespread rain is anticipated across the sub-region on September 11, followed by scattered rain activities from September 12 to September 17. The mountainous regions of northern India are similarly bracing for heightened monsoon activity. Uttarakhand is projected to receive widespread rainfall across several locations through September 14, raising concerns about potential landslides along fragile hilly terrains. Jammu and Kashmir will also experience active wet weather conditions over the coming days, bringing cooler temperatures but also requiring localized vigilance.
Severe Rain and Flood Risks in Bihar and Odisha
The upcoming days could prove highly challenging for several eastern states. In Bihar, where multiple districts are already battling severe flooding, the forecast of heavy rainfall on September 16 and September 17 has raised alarms. Additional heavy downpours are likely to increase water levels in already overflowing rivers, potentially worsening the flood situation and complicating ongoing rescue and relief efforts. Local administrative bodies have been put on high alert to handle any sudden rise in water levels.
Simultaneously, Odisha is on alert for exceptionally heavy rainfall. The sub-Himalayan regions of West Bengal and Sikkim are also predicted to experience heavy spells on September 13 and again around September 16-17. These areas face risks of intense lightning, severe thunderstorms, and gusty winds. Portions of Chhattisgarh and Odisha are expected to witness heavy to very heavy rainfall on September 11 as well. While the revival of the monsoon brings hope to farmers dealing with agricultural dry spells, it simultaneously presents severe logistical and safety challenges for hilly terrains and low-lying flood-prone regions.
