The India Meteorological Department issued district‑level red alerts and short‑lead warnings for parts of Delhi on September 11, forecasting moderate to heavy rain, thunderstorms and intense spells. Heavy downpours that day produced waterlogging in several localities and disrupted road traffic and some vehicle and flight movement.

Meteorologists forecast a continuing wet spell over the Delhi/NCR region into the weekend, including the BRICS Leaders' Summit dates of September 12–13, raising the prospect that outdoor movements and traffic during the summit period could be affected by further rain.

Delhi authorities put traffic management measures in place ahead of the summit. The Delhi Traffic Police announced temporary diversions and route restrictions timed to VVIP movements, and the Delhi administration ordered some school and office closures for parts of the summit period.

The 18th BRICS Leaders' Summit was scheduled to be held at Bharat Mandapam (Pragati Maidan) in New Delhi on September 12–13, and officials and news outlets warned that heavy rain could complicate traffic management and logistics on routes serving the venue and designated VVIP corridors.

At the time of reporting there was no public official statement that the summit itself would be cancelled or that summit sessions had been disrupted by weather. Authorities continued to implement traffic advisories and diversions while monitoring conditions.

Multiple national news organisations documented the IMD warnings, local waterlogging and the possibility that summit logistics and traffic around Bharat Mandapam could be affected by the wet weather.