September is close to Tiruvallur's year-round average, with average highs near 31.9°C and lows around 25.3°C (mean 28.6°C). It is a relatively wet time of year, averaging 136 mm of rainfall and 77% relative humidity across the period.
September is close to Tiruvallur's year-round average. Across 45 years of records, the warmest September in Tiruvallur was 2002 — when the month averaged 29.7°C — while the coldest was 1983 at 27.4°C. Typical September days reach 31.9°C with nights near 25.3°C. The long-term September temperature trend is broadly flat.
September is a relatively wet time of year in Tiruvallur, averaging 136 mm of rainfall. The wettest September on record was 2004 with 251 mm, while the driest was 1994 at 39 mm.
Relative humidity in Tiruvallur during September averages 77%. The most humid September was 1981 at 83%, and the least humid was 1986 at 69%.
September receives about 5.2 kWh/m²/day of solar energy in Tiruvallur. The sunniest Septembers were 2002 and 2011 at 5.8 kWh/m²/day, and the cloudiest was 2020 at 4.5.
Average wind speed in Tiruvallur during September is 2.7 m/s. The windiest September was 1983 at 3.2 m/s, while the calmest was 2017 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.4°C | 28.7°C | 28.8°C | 28.5°C | 28.5°C | +0.1°C |
| Avg High | 31.7°C | 32.2°C | 32.2°C | 31.8°C | 31.7°C | 0°C |
| Avg Low | 25.1°C | 25.3°C | 25.4°C | 25.3°C | 25.3°C | +0.2°C |
| Avg Rain | 146 mm | 109 mm | 138 mm | 148 mm | 143 mm | -3 mm |
September temperatures in Tiruvallur have risen by about 0.5°C between 1981–1985 and 2021–2025.
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.
A good time to visit Tiruvallur
September is a good time to visit Tiruvallur, with days averaging 31.9°C and nights around 25.3°C (mean 28.6°C, close to Tiruvallur'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 | 31.8°C | 28.6°C | 25.4°C | 33.5°C | 24.2°C | 158 mm | 79% | 2.5 m/s | 4.8 |
| 2024 | 33.0°C | 29.3°C | 25.6°C | 35.8°C | 24.2°C | 99 mm | 76% | 2.5 m/s | 5.1 |
| 2023 | 31.5°C | 28.4°C | 25.3°C | 34.1°C | 24.1°C | 224 mm | 82% | 2.9 m/s | 5.1 |
| 2022 | 31.4°C | 28.3°C | 25.3°C | 33.7°C | 22.8°C | 85 mm | 79% | 2.4 m/s | 5 |
| 2021 | 31.3°C | 28.2°C | 25.1°C | 33.4°C | 23.8°C | 116 mm | 80% | 2.8 m/s | 5 |
| 2020 | 30.9°C | 27.9°C | 25.0°C | 32.7°C | 22.6°C | 178 mm | 81% | 2.8 m/s | 4.5 |
| 2019 | 30.9°C | 28.1°C | 25.2°C | 33.7°C | 24.1°C | 247 mm | 83% | 3 m/s | 4.9 |
| 2018 | 32.9°C | 29.3°C | 25.6°C | 36.8°C | 24.7°C | 109 mm | 74% | 2.5 m/s | 5.4 |
| 2017 | 30.5°C | 27.9°C | 25.4°C | 32.9°C | 22.8°C | 180 mm | 83% | 2.2 m/s | 4.9 |
| 2016 | 33.0°C | 29.2°C | 25.4°C | 34.9°C | 24.6°C | 138 mm | 72% | 2.5 m/s | 4.8 |
| 2015 | 32.2°C | 28.9°C | 25.6°C | 35.4°C | 24.3°C | 103 mm | 77% | 2.3 m/s | 5.2 |
| 2014 | 31.9°C | 28.5°C | 25.1°C | 34.8°C | 23.1°C | 137 mm | 77% | 2.4 m/s | 5.3 |
| 2013 | 31.0°C | 27.9°C | 24.9°C | 32.8°C | 23.6°C | 187 mm | 81% | 2.5 m/s | 5.2 |
| 2012 | 32.1°C | 28.7°C | 25.3°C | 35.2°C | 22.7°C | 110 mm | 75% | 2.5 m/s | 5.3 |
| 2011 | 32.3°C | 28.7°C | 25.0°C | 34.2°C | 23.3°C | 133 mm | 76% | 2.7 m/s | 5.8 |
| 2010 | 31.3°C | 28.2°C | 25.1°C | 33.8°C | 24.1°C | 133 mm | 79% | 2.3 m/s | 5.1 |
| 2009 | 32.5°C | 29.0°C | 25.4°C | 35.2°C | 24.2°C | 183 mm | 77% | 2.8 m/s | 5.2 |
| 2008 | 32.4°C | 28.7°C | 25.1°C | 35.2°C | 23.7°C | 93 mm | 75% | 2.7 m/s | 5.5 |
| 2007 | 30.8°C | 27.7°C | 24.7°C | 32.7°C | 23.5°C | 131 mm | 82% | 2.7 m/s | 5.3 |
| 2006 | 32.2°C | 28.7°C | 25.3°C | 34.6°C | 24.1°C | 112 mm | 76% | 3 m/s | 5.2 |
| 2005 | 32.5°C | 29.1°C | 25.8°C | 35.6°C | 24.3°C | 136 mm | 76% | 2.7 m/s | 5.2 |
| 2004 🌧️ | 31.1°C | 28.1°C | 25.2°C | 34.5°C | 23.5°C | 251 mm | 79% | 2.6 m/s | 4.8 |
| 2003 | 33.0°C | 29.2°C | 25.5°C | 35.4°C | 24.2°C | 90 mm | 74% | 2.7 m/s | 5.6 |
| 2002 🔥 | 33.7°C | 29.7°C | 25.7°C | 36.1°C | 24.1°C | 98 mm | 72% | 2.7 m/s | 5.8 |
| 2001 | 31.8°C | 28.8°C | 25.7°C | 36.3°C | 24.4°C | 149 mm | 76% | 2.5 m/s | 5.1 |
| 2000 | 32.0°C | 28.8°C | 25.6°C | 34.9°C | 24.6°C | 141 mm | 77% | 2.5 m/s | 5.5 |
| 1999 | 33.3°C | 29.4°C | 25.4°C | 35.4°C | 24.2°C | 101 mm | 73% | 2.9 m/s | 5.4 |
| 1998 | 31.9°C | 28.7°C | 25.5°C | 34.1°C | 24.4°C | 113 mm | 77% | 2.9 m/s | 5 |
| 1997 | 32.2°C | 28.8°C | 25.5°C | 35.4°C | 24.4°C | 105 mm | 76% | 2.9 m/s | 5 |
| 1996 | 30.5°C | 27.6°C | 24.8°C | 33.2°C | 23.6°C | 194 mm | 81% | 2.5 m/s | 5 |
| 1995 | 31.3°C | 28.2°C | 25.1°C | 33.7°C | 24.0°C | 159 mm | 80% | 2.7 m/s | 5.1 |
| 1994 | 33.6°C | 29.4°C | 25.2°C | 37.1°C | 22.0°C | 39 mm | 70% | 2.9 m/s | 5.5 |
| 1993 | 31.2°C | 28.0°C | 24.8°C | 33.5°C | 23.7°C | 65 mm | 77% | 2.9 m/s | 5 |
| 1992 | 33.0°C | 29.2°C | 25.3°C | 35.3°C | 24.5°C | 78 mm | 71% | 2.6 m/s | 4.9 |
| 1991 | 32.8°C | 29.3°C | 25.8°C | 34.7°C | 24.5°C | 79 mm | 72% | 2.5 m/s | 5.2 |
| 1990 | 32.3°C | 28.8°C | 25.3°C | 36.6°C | 23.5°C | 159 mm | 74% | 2.6 m/s | 4.9 |
| 1989 | 31.8°C | 28.5°C | 25.2°C | 35.1°C | 23.8°C | 179 mm | 75% | 2.6 m/s | 4.9 |
| 1988 | 30.5°C | 27.7°C | 24.9°C | 32.4°C | 22.4°C | 152 mm | 82% | 2.8 m/s | 4.9 |
| 1987 | 33.0°C | 29.4°C | 25.9°C | 35.8°C | 24.6°C | 47 mm | 73% | 2.7 m/s | 5.2 |
| 1986 | 33.1°C | 29.4°C | 25.7°C | 36.7°C | 24.3°C | 98 mm | 69% | 2.5 m/s | 5.2 |
| 1985 | 30.8°C | 27.6°C | 24.5°C | 34.1°C | 23.0°C | 191 mm | 78% | 2.3 m/s | 5.5 |
| 1984 | 32.9°C | 29.1°C | 25.3°C | 37.1°C | 23.8°C | 209 mm | 70% | 3 m/s | 5.2 |
| 1983 ❄️ | 30.4°C | 27.4°C | 24.4°C | 32.6°C | 22.5°C | 177 mm | 82% | 3.2 m/s | — |
| 1982 | 32.5°C | 28.8°C | 25.0°C | 36.8°C | 23.9°C | 76 mm | 72% | 2.6 m/s | — |
| 1981 | 30.0°C | 27.5°C | 25.0°C | 32.6°C | 23.8°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 31.9°C with lows near 25.3°C (mean 28.6°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 risen by about 0.5°C. Daytime highs moved from 31.3°C to 31.8°C and overnight lows from 24.8°C to 25.3°C over the same span.
September is close to Tiruvallur's year-round average and a relatively wet time of year, so plan for around 31.9°C daytime highs and 25.3°C at night.
Not quite — September is the 6th coolest month in Tiruvallur, averaging 28.6°C.
For September in Tiruvallur, pack light, breathable clothing and sun protection, with typical highs of 31.9°C and lows of 25.3°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.
