Delhi Hit With Red Alert as Heavy Rain Floods Airport and Streets Again This Monsoon Season

Delhi got soaked again. The India Meteorological Department upgraded its weather warning for the capital from yellow to red on Friday, September 4, 2026, as dark clouds rolled in and heavy rain disrupted Janmashtami celebrations across the city, according to the Times of India and LiveMint.

Waterlogging was reported at Indira Gandhi International Airport, and flights arriving from Ahmedabad, Mumbai and Port Blair were delayed, the Times of India reported. IndiGo told passengers to check flight status online and to allow extra time because road conditions were slower than usual.

West Delhi took a direct hit too. India Today reported roads flooded in residential colonies including Gandhi Market in Sagarpur, though it noted no major roads or citywide traffic jams had been reported by the time of its update. IMD data cited by the Times of India and LiveMint showed Palam recorded 3.4 mm of rain between 11:30 am and 2:30 pm, and Najafgarh got 0.5 mm earlier in the morning, with most other stations recording nothing during that window. The worst downpours were highly localized even under a citywide red alert.

The IMD forecast more of the same for the rest of Friday: moderate rain across most areas, with isolated spots getting 50-100 mm along with thunderstorms, lightning and winds gusting to 60 kmph, per LiveMint. Noida and Ghaziabad were placed under an orange alert as of Friday afternoon; Gurugram had no specific warning at that time.

Not a one-off

India Today reported the IMD is tracking a low-pressure area over northeast Madhya Pradesh driving an active monsoon system across north-central India, and forecast another heavy-rain day for the Haryana-Chandigarh-Delhi region on Saturday, September 5, before the intensity is expected to ease starting September 6.

The pattern has recurred through the season. Business Today reported that on Monday, August 24, Delhi Airport logged 26 flight cancellations, 15 diversions and more than 390 delays, one of the most disruptive weather days of the season. NDTV reported the diverted flights that day broke down as 12 to Jaipur, two to Chandigarh and one to Lucknow. The next day, Tuesday, August 25, brought another red alert, with Flightradar24 recording 15 cancellations and more than 90 delays at IGI Airport, according to Business Today.

By late August, the numbers were already running well above normal. Business Today reported that as of August 24, Safdarjung had logged 246.2 mm of rain against a normal of 191.1 mm, a 29% surplus, while Ayanagar was 66% above its seasonal average at 266.3 mm. LiveMint, citing Hindustan Times, reported the city recorded 354.1 mm of rain for all of August, more than 120 mm above the IMD's long-period average of 233.1 mm for the month.

That's not a record by recent standards. News9Live, citing News18, reported Delhi logged 390.3 mm of rain in August 2024 and 400.81 mm in August 2025, and that the city has exceeded its August long-period average only six times since 2011, with 2020, 2024, 2025 and 2026 all falling in that stretch. Four wetter-than-normal Augusts in seven years marks a shift worth watching, though the sources here don't establish a specific cause beyond describing this monsoon's active weather systems.

The infrastructure question

What remains unanswered is why the same neighborhoods, including Sagarpur and areas near the airport, flood every time the rain intensifies. Delhi's civic agencies have spent years promising storm-drain upgrades. IMD alerts can tell residents when heavy rain is coming. They can't fix drainage that backs up under 50-100 mm of rain, which is a routine, not a rare, rainfall total during Delhi's monsoon.

Saturday, September 5, may bring a repeat of Friday's airport delays and street flooding, given the IMD's own forecast of continued heavy rain for the Haryana-Chandigarh-Delhi belt through that date. The IMD's current outlook shows no heavy-rain warning for the Delhi subdivision from September 6 onward, per India Today, though it left open the possibility of light rain or drizzle continuing.