September is one of the warmer months of the year in Tiruvallur, with average highs near 34.7°C and lows around 23.8°C (mean 29.3°C). It is a relatively wet time of year, averaging 136 mm of rainfall and 77% relative humidity across the period.
September is one of the warmer months of the year in Tiruvallur. Across 45 years of records, the warmest September in Tiruvallur was 2018 — when the month averaged 30.8°C — while the coldest was 1988 at 27.4°C. Typical September days reach 34.7°C with nights near 23.8°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 | 29.5°C | 29.1°C | 28.7°C | -0.5°C |
| Avg High | 34.8°C | 34.9°C | 35.1°C | 34.5°C | 33.9°C | -0.9°C |
| Avg Low | 23.6°C | 23.9°C | 24.1°C | 23.7°C | 23.6°C | 0°C |
| Avg Rain | 146 mm | 109 mm | 138 mm | 148 mm | 143 mm | -3 mm |
September temperatures in Tiruvallur have stayed relatively stable across the record.
September has ranged from a record low of 22°C (1994) to a record high of 37.1°C (1984).
Rainfall in September is a relatively wet time of year, averaging 136 mm, with a wettest year of 251 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0°C per decade, narrowing the gap between day and night.
A good time to visit Tiruvallur
September is a good time to visit Tiruvallur, with days averaging 34.7°C and nights around 23.8°C (mean 29.3°C, close to Tiruvallur'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 | 33.5°C | 24.2°C | 28.8°C | 158 mm | 79% | 2.5 m/s | 4.8 |
| 2024 | 35.8°C | 24.2°C | 30.0°C | 99 mm | 76% | 2.5 m/s | 5.1 |
| 2023 | 34.1°C | 24.1°C | 29.1°C | 224 mm | 82% | 2.9 m/s | 5.1 |
| 2022 | 33.7°C | 22.8°C | 28.3°C | 85 mm | 79% | 2.4 m/s | 5 |
| 2021 | 33.4°C | 23.8°C | 28.6°C | 116 mm | 80% | 2.8 m/s | 5 |
| 2020 | 32.7°C | 22.6°C | 27.6°C | 178 mm | 81% | 2.8 m/s | 4.5 |
| 2019 | 33.7°C | 24.1°C | 28.9°C | 247 mm | 83% | 3 m/s | 4.9 |
| 2018 🔥 | 36.8°C | 24.7°C | 30.8°C | 109 mm | 74% | 2.5 m/s | 5.4 |
| 2017 | 32.9°C | 22.8°C | 27.8°C | 180 mm | 83% | 2.2 m/s | 4.9 |
| 2016 | 34.9°C | 24.6°C | 29.7°C | 138 mm | 72% | 2.5 m/s | 4.8 |
| 2015 | 35.4°C | 24.3°C | 29.8°C | 103 mm | 77% | 2.3 m/s | 5.2 |
| 2014 | 34.8°C | 23.1°C | 28.9°C | 137 mm | 77% | 2.4 m/s | 5.3 |
| 2013 | 32.8°C | 23.6°C | 28.2°C | 187 mm | 81% | 2.5 m/s | 5.2 |
| 2012 | 35.2°C | 22.7°C | 28.9°C | 110 mm | 75% | 2.5 m/s | 5.3 |
| 2011 | 34.2°C | 23.3°C | 28.7°C | 133 mm | 76% | 2.7 m/s | 5.8 |
| 2010 | 33.8°C | 24.1°C | 28.9°C | 133 mm | 79% | 2.3 m/s | 5.1 |
| 2009 | 35.2°C | 24.2°C | 29.7°C | 183 mm | 77% | 2.8 m/s | 5.2 |
| 2008 | 35.2°C | 23.7°C | 29.4°C | 93 mm | 75% | 2.7 m/s | 5.5 |
| 2007 | 32.7°C | 23.5°C | 28.1°C | 131 mm | 82% | 2.7 m/s | 5.3 |
| 2006 | 34.6°C | 24.1°C | 29.4°C | 112 mm | 76% | 3 m/s | 5.2 |
| 2005 | 35.6°C | 24.3°C | 30.0°C | 136 mm | 76% | 2.7 m/s | 5.2 |
| 2004 🌧️ | 34.5°C | 23.5°C | 29.0°C | 251 mm | 79% | 2.6 m/s | 4.8 |
| 2003 | 35.4°C | 24.2°C | 29.8°C | 90 mm | 74% | 2.7 m/s | 5.6 |
| 2002 | 36.1°C | 24.1°C | 30.1°C | 98 mm | 72% | 2.7 m/s | 5.8 |
| 2001 | 36.3°C | 24.4°C | 30.3°C | 149 mm | 76% | 2.5 m/s | 5.1 |
| 2000 | 34.9°C | 24.6°C | 29.7°C | 141 mm | 77% | 2.5 m/s | 5.5 |
| 1999 | 35.4°C | 24.2°C | 29.8°C | 101 mm | 73% | 2.9 m/s | 5.4 |
| 1998 | 34.1°C | 24.4°C | 29.2°C | 113 mm | 77% | 2.9 m/s | 5 |
| 1997 | 35.4°C | 24.4°C | 29.9°C | 105 mm | 76% | 2.9 m/s | 5 |
| 1996 | 33.2°C | 23.6°C | 28.4°C | 194 mm | 81% | 2.5 m/s | 5 |
| 1995 | 33.7°C | 24.0°C | 28.8°C | 159 mm | 80% | 2.7 m/s | 5.1 |
| 1994 | 37.1°C | 22.0°C | 29.6°C | 39 mm | 70% | 2.9 m/s | 5.5 |
| 1993 | 33.5°C | 23.7°C | 28.6°C | 65 mm | 77% | 2.9 m/s | 5 |
| 1992 | 35.3°C | 24.5°C | 29.9°C | 78 mm | 71% | 2.6 m/s | 4.9 |
| 1991 | 34.7°C | 24.5°C | 29.6°C | 79 mm | 72% | 2.5 m/s | 5.2 |
| 1990 | 36.6°C | 23.5°C | 30.0°C | 159 mm | 74% | 2.6 m/s | 4.9 |
| 1989 | 35.1°C | 23.8°C | 29.5°C | 179 mm | 75% | 2.6 m/s | 4.9 |
| 1988 ❄️ | 32.4°C | 22.4°C | 27.4°C | 152 mm | 82% | 2.8 m/s | 4.9 |
| 1987 | 35.8°C | 24.6°C | 30.2°C | 47 mm | 73% | 2.7 m/s | 5.2 |
| 1986 | 36.7°C | 24.3°C | 30.5°C | 98 mm | 69% | 2.5 m/s | 5.2 |
| 1985 | 34.1°C | 23.0°C | 28.5°C | 191 mm | 78% | 2.3 m/s | 5.5 |
| 1984 | 37.1°C | 23.8°C | 30.5°C | 209 mm | 70% | 3 m/s | 5.2 |
| 1983 | 32.6°C | 22.5°C | 27.6°C | 177 mm | 82% | 3.2 m/s | — |
| 1982 | 36.8°C | 23.9°C | 30.4°C | 76 mm | 72% | 2.6 m/s | — |
| 1981 | 32.6°C | 23.8°C | 28.2°C | 186 mm | 83% | 2.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34.7°C with lows near 23.8°C (mean 29.3°C), based on 45 years of NASA POWER data.
September averages 136 mm of rainfall in Tiruvallur, a relatively wet time of year. The wettest on record was 251 mm in 2004.
The hottest September reached 37.1°C in 1984. The coldest dipped to 22°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have held steady by about 0°C. Daytime highs moved from 34.6°C to 34.1°C and overnight lows from 23.4°C to 23.8°C over the same span.
September is one of the warmer months of the year in Tiruvallur and a relatively wet time of year, so plan for around 34.7°C daytime highs and 23.8°C at night.
Not quite — September is the 6th coolest month in Tiruvallur, averaging 29.3°C.
For September in Tiruvallur, pack light, breathable clothing and sun protection, with typical highs of 34.7°C and lows of 23.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 77% — quite humid.
Average wind speed in September is 2.7 m/s. The windiest September on record averaged 3.2 m/s (1983).
The wettest September on record was 2004 with 251 mm. On average, September sees 136 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 Tiruvallur 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.
