September is one of the warmer months of the year in New Delhi, with average highs near 34.6°C and lows around 23.7°C (mean 29.2°C). It is a relatively wet time of year, averaging 105 mm of rainfall and 65% relative humidity across the period.
September is one of the warmer months of the year in New Delhi. Across 45 years of records, the warmest September in New Delhi was 1987 — when the month averaged 32.1°C — while the coldest was 1984 at 26.8°C. Typical September days reach 34.6°C with nights near 23.7°C. The long-term trend is cooling, about 0.2°C per decade.
September is a relatively wet time of year in New Delhi, averaging 105 mm of rainfall. The wettest September on record was 2021 with 252 mm, while the driest was 1982 at 2 mm.
Relative humidity in New Delhi during September averages 65%. The most humid September was 2021 at 87%, and the least humid was 1987 at 42%.
September receives about 5.1 kWh/m²/day of solar energy in New Delhi. The sunniest Septembers were 1994, 2001 and 2015, among others at 5.8 kWh/m²/day, and the cloudiest was 2010 at 4.
Average wind speed in New Delhi during September is 1.8 m/s. The windiest September was 2005 at 2.4 m/s, while the calmest was 2003 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 29.9°C | 28.7°C | 29.7°C | 28.5°C | 28.9°C | -1°C |
| Avg High | 36.1°C | 34.1°C | 35.5°C | 33.6°C | 33.4°C | -2.7°C |
| Avg Low | 23.6°C | 23.4°C | 23.9°C | 23.3°C | 24.4°C | +0.8°C |
| Avg Rain | 71 mm | 116 mm | 94 mm | 106 mm | 153 mm | +82 mm |
September temperatures in New Delhi have fallen by about 0.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 15.9°C (1994) to a record high of 42.4°C (1999).
Rainfall in September is a relatively wet time of year, averaging 105 mm, with a wettest year of 252 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.5°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
A good time to visit New Delhi
September is a good time to visit New Delhi, with days averaging 34.6°C and nights around 23.7°C (mean 29.2°C, warmer than New Delhi's yearly average) and higher rainfall. November and March are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 32.2°C | 27.8°C | 23.4°C | 33.8°C | 19.9°C | 144 mm | 80% | 2 m/s | 4.8 |
| 2024 | 31.9°C | 28.2°C | 24.6°C | 34.6°C | 22.4°C | 203 mm | 82% | 1.5 m/s | 4.1 |
| 2023 | 35.4°C | 29.9°C | 24.5°C | 38.3°C | 20.6°C | 80 mm | 69% | 2 m/s | 5 |
| 2022 | 35.0°C | 30.1°C | 25.3°C | 39.2°C | 22.8°C | 215 mm | 68% | 1.8 m/s | 4.5 |
| 2021 🌧️ | 30.8°C | 27.4°C | 24.0°C | 33.0°C | 21.6°C | 252 mm | 87% | 2.1 m/s | 4.2 |
| 2020 | 35.3°C | 30.0°C | 24.7°C | 37.4°C | 20.4°C | 26 mm | 63% | 1.5 m/s | 5.3 |
| 2019 | 34.7°C | 30.0°C | 25.3°C | 38.7°C | 22.5°C | 64 mm | 70% | 1.6 m/s | 4.3 |
| 2018 | 31.7°C | 27.3°C | 22.8°C | 33.8°C | 19.3°C | 182 mm | 76% | 1.9 m/s | 4.5 |
| 2017 | 35.2°C | 29.2°C | 23.2°C | 37.9°C | 18.2°C | 107 mm | 59% | 1.6 m/s | 4.9 |
| 2016 | 34.8°C | 29.0°C | 23.1°C | 37.2°C | 21.8°C | 31 mm | 61% | 1.5 m/s | 5.4 |
| 2015 | 36.7°C | 29.8°C | 22.9°C | 39.1°C | 19.3°C | 26 mm | 49% | 2 m/s | 5.8 |
| 2014 | 35.9°C | 29.6°C | 23.4°C | 38.4°C | 21.0°C | 63 mm | 58% | 2.1 m/s | 5.4 |
| 2013 | 32.8°C | 27.8°C | 22.7°C | 35.1°C | 20.8°C | 93 mm | 73% | 1.7 m/s | 5.4 |
| 2012 | 32.3°C | 27.5°C | 22.6°C | 34.4°C | 18.3°C | 66 mm | 75% | 1.9 m/s | 5.1 |
| 2011 | 31.7°C | 27.6°C | 23.5°C | 33.8°C | 19.5°C | 204 mm | 81% | 1.9 m/s | 5.1 |
| 2010 | 30.5°C | 26.9°C | 23.3°C | 32.7°C | 17.4°C | 229 mm | 83% | 1.6 m/s | 4 |
| 2009 | 34.1°C | 28.6°C | 23.1°C | 36.5°C | 20.2°C | 165 mm | 68% | 1.6 m/s | 5.2 |
| 2008 | 33.2°C | 28.1°C | 23.0°C | 37.4°C | 19.7°C | 138 mm | 74% | 1.5 m/s | 5.3 |
| 2007 | 36.0°C | 30.5°C | 25.0°C | 39.4°C | 21.5°C | 72 mm | 61% | 1.4 m/s | 5 |
| 2006 | 35.5°C | 29.7°C | 23.9°C | 37.5°C | 20.2°C | 91 mm | 62% | 1.8 m/s | 5.5 |
| 2005 | 34.3°C | 29.2°C | 24.2°C | 41.3°C | 19.3°C | 187 mm | 67% | 2.4 m/s | 4.8 |
| 2004 | 37.2°C | 30.4°C | 23.6°C | 40.2°C | 21.4°C | 12 mm | 53% | 1.8 m/s | 5.6 |
| 2003 | 33.0°C | 28.4°C | 23.8°C | 35.6°C | 20.3°C | 68 mm | 75% | 1.3 m/s | 4.2 |
| 2002 | 34.9°C | 29.0°C | 23.1°C | 38.0°C | 20.3°C | 145 mm | 63% | 1.7 m/s | 4.7 |
| 2001 | 38.5°C | 31.4°C | 24.3°C | 39.8°C | 20.9°C | 34 mm | 45% | 1.9 m/s | 5.8 |
| 2000 | 38.7°C | 31.8°C | 24.8°C | 40.6°C | 20.7°C | 23 mm | 46% | 1.8 m/s | 5.4 |
| 1999 | 37.7°C | 31.9°C | 26.0°C | 42.4°C | 23.8°C | 64 mm | 54% | 1.9 m/s | 4.5 |
| 1998 | 34.3°C | 29.5°C | 24.6°C | 39.5°C | 21.8°C | 173 mm | 71% | 1.8 m/s | 4.9 |
| 1997 | 36.4°C | 30.1°C | 23.7°C | 38.7°C | 20.5°C | 52 mm | 57% | 1.9 m/s | 5.1 |
| 1996 | 33.0°C | 27.8°C | 22.6°C | 36.3°C | 18.5°C | 129 mm | 73% | 1.7 m/s | 5.2 |
| 1995 | 32.4°C | 27.3°C | 22.3°C | 34.7°C | 18.0°C | 154 mm | 73% | 1.5 m/s | 5.4 |
| 1994 | 32.5°C | 27.0°C | 21.4°C | 34.0°C | 15.9°C | 23 mm | 71% | 2 m/s | 5.8 |
| 1993 | 33.8°C | 28.7°C | 23.7°C | 37.7°C | 21.5°C | 167 mm | 71% | 1.7 m/s | 4.5 |
| 1992 | 34.6°C | 28.8°C | 23.0°C | 37.0°C | 19.2°C | 90 mm | 62% | 2.1 m/s | 5.2 |
| 1991 | 33.7°C | 28.0°C | 22.3°C | 35.2°C | 19.0°C | 96 mm | 69% | 1.8 m/s | 5.5 |
| 1990 | 32.5°C | 28.3°C | 24.0°C | 35.6°C | 22.3°C | 212 mm | 77% | 1.7 m/s | 4.7 |
| 1989 | 36.9°C | 30.5°C | 24.1°C | 39.8°C | 21.1°C | 80 mm | 53% | 1.8 m/s | 5.3 |
| 1988 | 34.0°C | 28.9°C | 23.9°C | 37.5°C | 20.5°C | 147 mm | 73% | 2.1 m/s | 5.4 |
| 1987 🔥 | 39.7°C | 32.1°C | 24.6°C | 41.5°C | 21.0°C | 27 mm | 42% | 1.8 m/s | 5.8 |
| 1986 | 38.2°C | 31.1°C | 23.9°C | 41.6°C | 21.1°C | 63 mm | 42% | 2.1 m/s | 5.5 |
| 1985 | 35.1°C | 29.1°C | 23.1°C | 38.1°C | 20.7°C | 56 mm | 62% | 2.1 m/s | 5.2 |
| 1984 ❄️ | 31.5°C | 26.8°C | 22.1°C | 34.3°C | 17.9°C | 110 mm | 73% | 1.6 m/s | 5.6 |
| 1983 | 34.8°C | 29.6°C | 24.4°C | 37.7°C | 21.9°C | 88 mm | 69% | 1.6 m/s | — |
| 1982 | 36.8°C | 29.3°C | 21.7°C | 38.5°C | 17.1°C | 2 mm | 51% | 2.1 m/s | — |
| 1981 | 37.9°C | 31.3°C | 24.8°C | 40.4°C | 22.2°C | 70 mm | 52% | 2.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34.6°C with lows near 23.7°C (mean 29.2°C), based on 45 years of NASA POWER data.
September averages 105 mm of rainfall in New Delhi, a relatively wet time of year. The wettest on record was 252 mm in 2021.
The hottest September reached 42.4°C in 1999. The coldest dipped to 15.9°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have fallen by about 0.5°C — but days and nights have moved in opposite directions. Overnight lows rose from 23.2°C to 24.4°C while daytime highs eased from 35.2°C to 33.1°C, narrowing the gap between day and night.
September is one of the warmer months of the year in New Delhi and a relatively wet time of year, so plan for around 34.6°C daytime highs and 23.7°C at night.
Not quite — September is the 7th coolest month in New Delhi, averaging 29.2°C.
For September in New Delhi, pack light, breathable clothing and sun protection, with typical highs of 34.6°C and lows of 23.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 65% — moderately humid.
Average wind speed in September is 1.8 m/s. The windiest September on record averaged 2.4 m/s (2005).
The wettest September on record was 2021 with 252 mm. On average, September sees 105 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in New Delhi behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
