Overview
- The Safdarjung observatory logged a 21°C minimum on Sunday, marking the second‑lowest September night since 2001 and about 2.9°C below the seasonal average.
- Light rain and sustained cloud from the depression produced roughly 4.9–5 mm of rain at Safdarjung and suppressed daytime heating across Delhi.
- Delhi’s 24‑hour average air quality improved to the ‘satisfactory’ band with AQI readings near 53–56 after the showers cleared particulates from the air.
- The India Meteorological Department says the depression will weaken and dry northwesterly winds will raise temperatures in Delhi this week, but it has issued isolated heavy‑rain and thunderstorm warnings for Uttarakhand, the Andaman and Nicobar Islands, south interior Karnataka and parts of central and eastern India.
- The cool spell follows the monsoon’s early withdrawal from Delhi on September 23 and a season total of 728.6 mm at Safdarjung, and experts emphasize the drop in temperature was caused by the Bay of Bengal system rather than an early winter or El Niño with residents getting brief relief before a return to warmer, drier weather.