September is close to Chengalpattu's year-round average, with average highs near 31.5°C and lows around 25.8°C (mean 28.7°C). It is a relatively wet time of year, averaging 132 mm of rainfall and 77% relative humidity across the period.
September is close to Chengalpattu's year-round average. Across 45 years of records, the warmest September in Chengalpattu was 2002 — when the month averaged 29.8°C — while the coldest were 1981, 1983 and 1996 at 27.6°C. Typical September days reach 31.5°C with nights near 25.8°C. The long-term September temperature trend is broadly flat.
September is a relatively wet time of year in Chengalpattu, averaging 132 mm of rainfall. The wettest September on record was 2004 with 239 mm, while the driest was 1994 at 40 mm.
Relative humidity in Chengalpattu during September averages 77%. The most humid September was 1981 at 83%, and the least humid was 1994 at 71%.
September receives about 5.4 kWh/m²/day of solar energy in Chengalpattu. The sunniest September was 2002 at 6 kWh/m²/day, and the cloudiest was 2020 at 4.6.
Average wind speed in Chengalpattu during September is 2.9 m/s. The windiest September was 1983 at 3.7 m/s, while the calmest was 2010 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.4°C | 28.8°C | 28.9°C | 28.6°C | 28.6°C | +0.2°C |
| Avg High | 31.3°C | 31.8°C | 31.9°C | 31.4°C | 31.3°C | 0°C |
| Avg Low | 25.5°C | 25.8°C | 26.0°C | 25.8°C | 25.9°C | +0.4°C |
| Avg Rain | 139 mm | 112 mm | 128 mm | 144 mm | 146 mm | +7 mm |
September temperatures in Chengalpattu have risen by about 0.6°C between 1981–1985 and 2021–2025.
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.
A good time to visit Chengalpattu
September is a good time to visit Chengalpattu, with days averaging 31.5°C and nights around 25.8°C (mean 28.7°C, close to Chengalpattu's yearly average) and higher rainfall. January and February 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 | 31.5°C | 28.8°C | 26.1°C | 32.7°C | 25.1°C | 164 mm | 79% | 2.7 m/s | 5.2 |
| 2024 | 32.5°C | 29.3°C | 26.2°C | 35.0°C | 25.1°C | 82 mm | 77% | 2.6 m/s | 5.4 |
| 2023 | 31.3°C | 28.6°C | 25.8°C | 33.3°C | 24.9°C | 192 mm | 81% | 3.2 m/s | 5.6 |
| 2022 | 31.1°C | 28.5°C | 25.9°C | 33.1°C | 24.0°C | 97 mm | 79% | 2.6 m/s | 5.2 |
| 2021 | 30.8°C | 28.3°C | 25.7°C | 32.7°C | 24.5°C | 143 mm | 81% | 2.9 m/s | 5.2 |
| 2020 | 30.6°C | 28.1°C | 25.6°C | 32.4°C | 24.0°C | 195 mm | 81% | 3.1 m/s | 4.6 |
| 2019 | 30.6°C | 28.2°C | 25.8°C | 33.1°C | 25.2°C | 221 mm | 82% | 3.2 m/s | 5 |
| 2018 | 32.1°C | 29.1°C | 26.1°C | 35.9°C | 25.5°C | 109 mm | 75% | 2.7 m/s | 5.7 |
| 2017 | 30.3°C | 28.2°C | 26.0°C | 32.3°C | 24.3°C | 166 mm | 82% | 2.6 m/s | 5.1 |
| 2016 | 32.4°C | 29.1°C | 25.9°C | 34.5°C | 25.1°C | 128 mm | 74% | 2.6 m/s | 5.2 |
| 2015 | 31.9°C | 29.1°C | 26.3°C | 34.8°C | 25.0°C | 98 mm | 77% | 2.7 m/s | 5.6 |
| 2014 | 31.4°C | 28.5°C | 25.7°C | 33.7°C | 24.1°C | 139 mm | 78% | 2.6 m/s | 5.6 |
| 2013 | 30.6°C | 28.0°C | 25.3°C | 32.5°C | 24.4°C | 180 mm | 81% | 2.9 m/s | 5.4 |
| 2012 | 31.6°C | 28.7°C | 25.9°C | 34.6°C | 24.4°C | 108 mm | 76% | 2.7 m/s | 5.5 |
| 2011 | 31.7°C | 28.7°C | 25.7°C | 33.4°C | 24.5°C | 142 mm | 77% | 2.9 m/s | 5.9 |
| 2010 | 30.9°C | 28.3°C | 25.7°C | 33.2°C | 24.7°C | 144 mm | 79% | 2.5 m/s | 5.1 |
| 2009 | 32.3°C | 29.2°C | 26.1°C | 35.0°C | 24.9°C | 161 mm | 77% | 3.1 m/s | 5.7 |
| 2008 | 31.9°C | 28.8°C | 25.7°C | 34.5°C | 24.6°C | 80 mm | 75% | 3 m/s | 5.6 |
| 2007 | 30.6°C | 28.0°C | 25.4°C | 32.3°C | 24.1°C | 127 mm | 82% | 3 m/s | 5.5 |
| 2006 | 31.9°C | 28.9°C | 25.9°C | 34.1°C | 24.6°C | 95 mm | 76% | 3.4 m/s | 5.3 |
| 2005 | 32.0°C | 29.1°C | 26.2°C | 34.8°C | 25.2°C | 134 mm | 77% | 2.9 m/s | 5.4 |
| 2004 🌧️ | 30.6°C | 28.1°C | 25.7°C | 33.7°C | 24.5°C | 239 mm | 80% | 2.8 m/s | 4.9 |
| 2003 | 32.8°C | 29.5°C | 26.1°C | 35.4°C | 25.1°C | 80 mm | 73% | 3 m/s | 5.9 |
| 2002 🔥 | 33.3°C | 29.8°C | 26.3°C | 35.6°C | 24.9°C | 95 mm | 72% | 3 m/s | 6 |
| 2001 | 31.5°C | 28.8°C | 26.1°C | 35.2°C | 25.2°C | 145 mm | 77% | 2.8 m/s | 5.6 |
| 2000 | 31.7°C | 28.9°C | 26.1°C | 34.4°C | 25.4°C | 126 mm | 77% | 2.8 m/s | 5.6 |
| 1999 | 32.6°C | 29.2°C | 25.9°C | 34.6°C | 24.7°C | 99 mm | 74% | 3.2 m/s | 5.6 |
| 1998 | 31.8°C | 28.9°C | 25.9°C | 34.0°C | 25.0°C | 120 mm | 77% | 3.1 m/s | 5.3 |
| 1997 | 31.7°C | 28.8°C | 26.0°C | 34.6°C | 25.1°C | 97 mm | 76% | 3.2 m/s | 5.2 |
| 1996 | 30.1°C | 27.6°C | 25.2°C | 32.7°C | 24.0°C | 190 mm | 82% | 2.9 m/s | 5.2 |
| 1995 | 31.2°C | 28.5°C | 25.8°C | 33.4°C | 25.1°C | 143 mm | 79% | 2.9 m/s | 5.1 |
| 1994 | 33.0°C | 29.4°C | 25.8°C | 36.2°C | 23.0°C | 40 mm | 71% | 3.2 m/s | 5.8 |
| 1993 | 31.1°C | 28.3°C | 25.5°C | 33.1°C | 24.2°C | 74 mm | 77% | 3.1 m/s | 5.3 |
| 1992 | 32.4°C | 29.1°C | 25.9°C | 34.6°C | 25.1°C | 104 mm | 72% | 2.7 m/s | 5.1 |
| 1991 | 32.5°C | 29.4°C | 26.3°C | 34.0°C | 24.9°C | 80 mm | 73% | 2.8 m/s | 5.3 |
| 1990 | 31.5°C | 28.6°C | 25.8°C | 36.0°C | 24.4°C | 170 mm | 76% | 2.9 m/s | 5.1 |
| 1989 | 31.6°C | 28.7°C | 25.8°C | 35.2°C | 24.5°C | 157 mm | 74% | 2.7 m/s | 5 |
| 1988 | 30.5°C | 28.0°C | 25.5°C | 32.8°C | 23.6°C | 132 mm | 81% | 3.2 m/s | 5.2 |
| 1987 | 32.5°C | 29.4°C | 26.3°C | 35.2°C | 24.8°C | 57 mm | 74% | 2.9 m/s | 5.4 |
| 1986 | 32.2°C | 29.0°C | 25.8°C | 35.4°C | 25.1°C | 95 mm | 73% | 2.7 m/s | 5.7 |
| 1985 | 30.5°C | 27.7°C | 25.0°C | 33.1°C | 23.4°C | 181 mm | 78% | 2.6 m/s | 5.5 |
| 1984 | 31.9°C | 28.7°C | 25.6°C | 35.6°C | 24.4°C | 194 mm | 73% | 3.1 m/s | 5.5 |
| 1983 | 30.4°C | 27.6°C | 24.8°C | 32.4°C | 23.1°C | 161 mm | 81% | 3.7 m/s | — |
| 1982 | 32.0°C | 28.8°C | 25.7°C | 35.6°C | 24.8°C | 92 mm | 72% | 2.8 m/s | — |
| 1981 ❄️ | 29.8°C | 27.6°C | 25.4°C | 32.1°C | 24.5°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 31.5°C with lows near 25.8°C (mean 28.7°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 0.6°C. Daytime highs moved from 30.9°C to 31.4°C and overnight lows from 25.3°C to 25.9°C over the same span.
September is close to Chengalpattu's year-round average and a relatively wet time of year, so plan for around 31.5°C daytime highs and 25.8°C at night.
Not quite — September is the 7th coolest month in Chengalpattu, averaging 28.7°C.
For September in Chengalpattu, pack light, breathable clothing and sun protection, with typical highs of 31.5°C and lows of 25.8°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.
