Delhi Weather: Why India Searched It on 17 September 2026 — Rain Forecast, AQI and Monsoon Withdrawal

Searches for delhi weather spiked in India around 16–17 September 2026, with Google Trends recording roughly 200 searches and 500% growth over 24 hours as of 17 September. The trigger was a stretch of humid, unsettled weather in the capital: a cloudy morning, an IMD forecast of light rain, a 'moderate' air quality reading, and the first signs that the southwest monsoon was preparing to withdraw. Note that all reports cited here are dated 16–17 September 2026 and do not describe conditions on 20 September or later.

What the IMD forecast for Delhi on 17 September

According to a PTI report carried by ThePrint, Delhi woke up to cloudy skies on Thursday, 17 September, with the minimum temperature settling at 25.2°C. The weather office forecast generally cloudy skies with light rain or drizzle at isolated places through the day, morning relative humidity of 60 per cent, and a maximum temperature likely to hover around 35°C.

A day earlier, Down To Earth's daily weather tracker (16 September) reported that Delhi-NCR faced humid conditions with a yellow alert for heavy rainfall, possible thunderstorms, lightning and gusty winds, with the maximum around 34°C and the minimum near 25°C. Notably, a separate Inshorts summary of IMD's heavy-rainfall warning for 17 September listed states such as Bihar, Kerala and Tamil Nadu but did not include Delhi — so the yellow alert for the capital rests on the Down To Earth tracker alone.

Why temperatures varied so much across the city

One striking detail in the 17 September PTI report was the station-wise spread of minimum temperatures, which shows how weather in New Delhi can differ sharply within a few kilometres:

• The Ridge: 20.6°C
• Palam: 23.0°C
• Lodi Road: 24.7°C
• Ayanagar: 24.8°C
• Safdarjung (city average): 25.2°C

The Ridge, a greener, more elevated and relatively open area, routinely records lower minimums than built-up localities, where concrete and traffic trap heat overnight. A nearly 5°C gap between stations is a useful reminder that a single 'Delhi temperature' hides considerable local variation.

Air quality: 'moderate' at AQI 105

Delhi's AQI stood at 105 at 9:30 am on 17 September, placing it in the CPCB's 'moderate' category (101–200), per the PTI report. On the CPCB scale, 0–50 is 'good', 51–100 'satisfactory', 101–200 'moderate', and anything above 200 ranges from 'poor' to 'severe'. A reading of 105 is typical of the post-monsoon transition period, before winter stagnation pushes pollution sharply higher — but it is a dated figure, not a current one.

The bigger picture: monsoon withdrawal approaching

The unsettled weather in New Delhi was part of a national pattern. A low-pressure area over Saurashtra and the northeast Arabian Sea, with the monsoon trough passing through it, was driving rain and thunderstorms across at least 12 states on 16 September. At the same time, the IMD indicated that conditions could become favourable for the southwest monsoon to withdraw from parts of western Rajasthan around 19 September 2026. That was an indication, not a confirmed declaration — withdrawal is officially announced only after specific criteria on rainfall cessation and atmospheric circulation are met.

This transitional phase explains why Delhi weather felt simultaneously humid, warm and showery: residual monsoon moisture kept humidity high even as the system prepared to retreat, and passing cloud bands brought isolated drizzle without sustained rain.

What searchers should take away

The 17 September trend reflected genuine weather interest — cloudy skies, a light-rain forecast, moderate air quality and the looming monsoon retreat — rather than any extreme event in the capital. For current conditions, check the IMD's latest Delhi forecast and the CPCB's live AQI, since the figures above describe 16–17 September 2026 only. Google Trends data confirms search interest in the term, not the accuracy of any weather claim.