India Weather Today, September 23, 2026: IMD Warns of Heavy to Extremely Heavy Rain; Hyderabad, Bengaluru, Mumbai, Pune and Kolkata Under Weather Watch

A robust tropical disturbance over the westcentral and adjoining northwest Bay of Bengal has intensified into a Deep Depression, prompting the India Meteorological Department (IMD) to issue severe weather alerts across eastern, peninsular, and central India on Wednesday, September 23, 2026. Moving northwestwards, the weather system is tracking toward the North Andhra Pradesh and South Odisha coastline, dragging monsoon moisture inland and triggering widespread thunderstorms, squally winds, and lightning across key urban business corridors. While southern and eastern commercial hubs—including Hyderabad, Bengaluru, Pune, Kolkata, and Mumbai—are experiencing localized waterlogging and traffic disruptions, Delhi-NCR presents a sharp climatic contrast, maintaining dry, sunny skies with peak temperatures touching 35°C.

The Synoptic Engine: Bay of Bengal Deep Depression Tracks Inland

The core catalyst driving current downpours originated as a low-pressure system on September 22 before gathering strength over warm oceanic waters. In its morning synoptic bulletin, the IMD noted: "The Deep Depression over Westcentral & adjoining Northwest Bay of Bengal is very likely to cross North Andhra Pradesh - South Odisha coasts."

As the system approaches landfall, feeder bands are unleashing localized convective downpours. In Telangana, Hyderabad logged 21.8 mm of rainfall within a 24-hour observation window, causing morning peak-hour transit slowdowns. In Maharashtra, Pune (Lohegaon) recorded 13 mm accompanied by sudden lightning activity, while coastal Mumbai braces for periodic moderate-to-heavy showers under a humid 33°C ceiling. Further south, the IT corridor of Bengaluru faces sustained squally surface winds gusting between 30 and 40 kmph.

"The convergence of moist maritime winds ahead of the Bay of Bengal deep depression is generating rapid localized convective clouds over peninsular and eastern belts, elevating flash flood and lightning risks over the next 48 hours," meteorological radar divisions cautioned.

Urban Outlook: Commuter Advisories and Rain Forecasts

City municipal corporations have issued localized safety alerts as weather models project continued activity:

• Kolkata & South Bengal: While Kolkata recorded 5 mm in early observations, atmospheric instability will escalate significantly on September 24, with regional centers forecasting sustained heavy downpours and lightning strikes across Gangetic West Bengal.
• Bengaluru & Hyderabad: Urban civic authorities have advised caution around low-lying underpasses. Bengaluru's combination of squally winds and sudden showers presents tree-fall risks, while Hyderabad's civic teams remain deployed across vulnerable waterlogging hotspots.
• Mumbai & Coastal Maharashtra: Commuters along the Western and Central suburban railway lines can expect short, intense showers that may cause localized road traffic delays without halting mainline logistics.

The Macro Monsoon Angle: Maharashtra Deficit and Withdrawal Timelines

The current spell carries major agricultural implications as the Southwest Monsoon approaches its concluding leg. Despite recent rains, Maharashtra continues to navigate an aggregate 17% seasonal rainfall deficit, with key catchment dams in the Marathwada and Vidarbha belts requiring late-season precipitation to shore up winter reserves.

Climatological models indicate that once this deep depression crosses the eastern seaboard and dissipates inland over central India, the monsoon withdrawal dynamic will accelerate. The formal retreat line is projected to cross northwest India and begin exiting Maharashtra around October 5, making the ongoing rain spell the likely final substantial monsoon recharge of the season.