September is one of the warmer months of the year in Chengalpattu, with average highs near 34.1°C and lows around 24.6°C (mean 29.4°C). It is a relatively wet time of year, averaging 132 mm of rainfall and 77% relative humidity across the period.
September is one of the warmer months of the year in Chengalpattu. Across 45 years of records, the warmest September in Chengalpattu was 2018 — when the month averaged 30.7°C — while the coldest was 1983 at 27.8°C. Typical September days reach 34.1°C with nights near 24.6°C. The long-term September temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 29.2°C | 29.4°C | 29.7°C | 29.3°C | 28.9°C | -0.3°C |
| Avg High | 34.2°C | 34.3°C | 34.5°C | 33.8°C | 33.2°C | -1°C |
| Avg Low | 24.2°C | 24.6°C | 24.8°C | 24.7°C | 24.6°C | +0.4°C |
| Avg Rain | 139 mm | 112 mm | 128 mm | 144 mm | 146 mm | +7 mm |
September temperatures in Chengalpattu have stayed relatively stable across the record.
September has ranged from a record low of 23°C (1994) to a record high of 36.2°C (1994).
Rainfall in September is a relatively wet time of year, averaging 132 mm, with a wettest year of 239 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
A good time to visit Chengalpattu
September is a good time to visit Chengalpattu, with days averaging 34.1°C and nights around 24.6°C (mean 29.4°C, close to Chengalpattu's yearly average) and higher rainfall. January and February are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 32.7°C | 25.1°C | 28.9°C | 164 mm | 79% | 2.7 m/s | 5.2 |
| 2024 | 35.0°C | 25.1°C | 30.1°C | 82 mm | 77% | 2.6 m/s | 5.4 |
| 2023 | 33.3°C | 24.9°C | 29.1°C | 192 mm | 81% | 3.2 m/s | 5.6 |
| 2022 | 33.1°C | 24.0°C | 28.5°C | 97 mm | 79% | 2.6 m/s | 5.2 |
| 2021 | 32.7°C | 24.5°C | 28.6°C | 143 mm | 81% | 2.9 m/s | 5.2 |
| 2020 | 32.4°C | 24.0°C | 28.2°C | 195 mm | 81% | 3.1 m/s | 4.6 |
| 2019 | 33.1°C | 25.2°C | 29.2°C | 221 mm | 82% | 3.2 m/s | 5 |
| 2018 🔥 | 35.9°C | 25.5°C | 30.7°C | 109 mm | 75% | 2.7 m/s | 5.7 |
| 2017 | 32.3°C | 24.3°C | 28.3°C | 166 mm | 82% | 2.6 m/s | 5.1 |
| 2016 | 34.5°C | 25.1°C | 29.8°C | 128 mm | 74% | 2.6 m/s | 5.2 |
| 2015 | 34.8°C | 25.0°C | 29.9°C | 98 mm | 77% | 2.7 m/s | 5.6 |
| 2014 | 33.7°C | 24.1°C | 28.9°C | 139 mm | 78% | 2.6 m/s | 5.6 |
| 2013 | 32.5°C | 24.4°C | 28.4°C | 180 mm | 81% | 2.9 m/s | 5.4 |
| 2012 | 34.6°C | 24.4°C | 29.5°C | 108 mm | 76% | 2.7 m/s | 5.5 |
| 2011 | 33.4°C | 24.5°C | 28.9°C | 142 mm | 77% | 2.9 m/s | 5.9 |
| 2010 | 33.2°C | 24.7°C | 29.0°C | 144 mm | 79% | 2.5 m/s | 5.1 |
| 2009 | 35.0°C | 24.9°C | 29.9°C | 161 mm | 77% | 3.1 m/s | 5.7 |
| 2008 | 34.5°C | 24.6°C | 29.5°C | 80 mm | 75% | 3 m/s | 5.6 |
| 2007 | 32.3°C | 24.1°C | 28.2°C | 127 mm | 82% | 3 m/s | 5.5 |
| 2006 | 34.1°C | 24.6°C | 29.3°C | 95 mm | 76% | 3.4 m/s | 5.3 |
| 2005 | 34.8°C | 25.2°C | 30.0°C | 134 mm | 77% | 2.9 m/s | 5.4 |
| 2004 🌧️ | 33.7°C | 24.5°C | 29.1°C | 239 mm | 80% | 2.8 m/s | 4.9 |
| 2003 | 35.4°C | 25.1°C | 30.3°C | 80 mm | 73% | 3 m/s | 5.9 |
| 2002 | 35.6°C | 24.9°C | 30.2°C | 95 mm | 72% | 3 m/s | 6 |
| 2001 | 35.2°C | 25.2°C | 30.2°C | 145 mm | 77% | 2.8 m/s | 5.6 |
| 2000 | 34.4°C | 25.4°C | 29.9°C | 126 mm | 77% | 2.8 m/s | 5.6 |
| 1999 | 34.6°C | 24.7°C | 29.6°C | 99 mm | 74% | 3.2 m/s | 5.6 |
| 1998 | 34.0°C | 25.0°C | 29.5°C | 120 mm | 77% | 3.1 m/s | 5.3 |
| 1997 | 34.6°C | 25.1°C | 29.8°C | 97 mm | 76% | 3.2 m/s | 5.2 |
| 1996 | 32.7°C | 24.0°C | 28.3°C | 190 mm | 82% | 2.9 m/s | 5.2 |
| 1995 | 33.4°C | 25.1°C | 29.2°C | 143 mm | 79% | 2.9 m/s | 5.1 |
| 1994 | 36.2°C | 23.0°C | 29.6°C | 40 mm | 71% | 3.2 m/s | 5.8 |
| 1993 | 33.1°C | 24.2°C | 28.7°C | 74 mm | 77% | 3.1 m/s | 5.3 |
| 1992 | 34.6°C | 25.1°C | 29.9°C | 104 mm | 72% | 2.7 m/s | 5.1 |
| 1991 | 34.0°C | 24.9°C | 29.5°C | 80 mm | 73% | 2.8 m/s | 5.3 |
| 1990 | 36.0°C | 24.4°C | 30.2°C | 170 mm | 76% | 2.9 m/s | 5.1 |
| 1989 | 35.2°C | 24.5°C | 29.8°C | 157 mm | 74% | 2.7 m/s | 5 |
| 1988 | 32.8°C | 23.6°C | 28.2°C | 132 mm | 81% | 3.2 m/s | 5.2 |
| 1987 | 35.2°C | 24.8°C | 30.0°C | 57 mm | 74% | 2.9 m/s | 5.4 |
| 1986 | 35.4°C | 25.1°C | 30.2°C | 95 mm | 73% | 2.7 m/s | 5.7 |
| 1985 | 33.1°C | 23.4°C | 28.3°C | 181 mm | 78% | 2.6 m/s | 5.5 |
| 1984 | 35.6°C | 24.4°C | 30.0°C | 194 mm | 73% | 3.1 m/s | 5.5 |
| 1983 ❄️ | 32.4°C | 23.1°C | 27.8°C | 161 mm | 81% | 3.7 m/s | — |
| 1982 | 35.6°C | 24.8°C | 30.2°C | 92 mm | 72% | 2.8 m/s | — |
| 1981 | 32.1°C | 24.5°C | 28.3°C | 178 mm | 83% | 2.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34.1°C with lows near 24.6°C (mean 29.4°C), based on 45 years of NASA POWER data.
September averages 132 mm of rainfall in Chengalpattu, a relatively wet time of year. The wettest on record was 239 mm in 2004.
The hottest September reached 36.2°C in 1994. The coldest dipped to 23°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.1°C. Daytime highs moved from 33.8°C to 33.4°C and overnight lows from 24°C to 24.7°C over the same span.
September is one of the warmer months of the year in Chengalpattu and a relatively wet time of year, so plan for around 34.1°C daytime highs and 24.6°C at night.
Not quite — September is the 7th coolest month in Chengalpattu, averaging 29.4°C.
For September in Chengalpattu, pack light, breathable clothing and sun protection, with typical highs of 34.1°C and lows of 24.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 77% — quite humid.
Average wind speed in September is 2.9 m/s. The windiest September on record averaged 3.7 m/s (1983).
The wettest September on record was 2004 with 239 mm. On average, September sees 132 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 Chengalpattu 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.
