September is close to Tirunelveli's year-round average, with average highs near 29.5°C and lows around 22.7°C (mean 26.1°C). It is a relatively wet time of year, averaging 138 mm of rainfall and 84% relative humidity across the period.
September is close to Tirunelveli's year-round average. Across 45 years of records, the warmest September in Tirunelveli was 2016 — when the month averaged 27.9°C — while the coldest was 1992 at 24.8°C. Typical September days reach 29.5°C with nights near 22.7°C. The long-term trend is warming, about 0.4°C per decade.
September is a relatively wet time of year in Tirunelveli, averaging 138 mm of rainfall. The wettest September on record was 1981 with 502 mm, while the driest was 2016 at 5 mm.
Relative humidity in Tirunelveli during September averages 84%. The most humid September was 1998 at 91%, and the least humid was 2016 at 74%.
September receives about 5.5 kWh/m²/day of solar energy in Tirunelveli. The sunniest September was 2002 at 6.3 kWh/m²/day, and the cloudiest was 1996 at 4.5.
Average wind speed in Tirunelveli during September is 3.4 m/s. The windiest September was 2016 at 4.7 m/s, while the calmest was 2004 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.5°C | 25.6°C | 25.8°C | 26.9°C | 27.0°C | +1.5°C |
| Avg High | 28.7°C | 28.8°C | 29.0°C | 30.7°C | 30.6°C | +1.9°C |
| Avg Low | 22.2°C | 22.4°C | 22.6°C | 23.0°C | 23.4°C | +1.2°C |
| Avg Rain | 183 mm | 125 mm | 193 mm | 79 mm | 98 mm | -86 mm |
September temperatures in Tirunelveli have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 20°C (1982) to a record high of 35.6°C (2015).
Rainfall in September is a relatively wet time of year, averaging 138 mm, with a wettest year of 502 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Tirunelveli
September is a good time to visit Tirunelveli, with days averaging 29.5°C and nights around 22.7°C (mean 26.1°C, close to Tirunelveli's yearly average) and higher rainfall. January and December 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 | 30.6°C | 27.2°C | 23.8°C | 33.3°C | 22.9°C | 71 mm | 82% | 3.6 m/s | 5.5 |
| 2024 | 30.7°C | 27.2°C | 23.7°C | 33.3°C | 23.0°C | 75 mm | 83% | 3.7 m/s | 5.7 |
| 2023 | 31.0°C | 27.2°C | 23.5°C | 32.6°C | 22.5°C | 139 mm | 80% | 3.4 m/s | 4.9 |
| 2022 | 31.6°C | 27.2°C | 22.8°C | 35.0°C | 21.5°C | 31 mm | 79% | 3.6 m/s | 5.9 |
| 2021 | 30.6°C | 27.0°C | 23.4°C | 33.5°C | 22.0°C | 103 mm | 82% | 3.6 m/s | 5.4 |
| 2020 | 28.8°C | 25.9°C | 23.0°C | 32.1°C | 21.3°C | 168 mm | 86% | 3.4 m/s | 4.6 |
| 2019 | 29.7°C | 26.4°C | 23.2°C | 31.8°C | 21.8°C | 161 mm | 84% | 2.9 m/s | 5.2 |
| 2018 | 31.8°C | 27.1°C | 22.4°C | 35.4°C | 20.5°C | 41 mm | 79% | 2.9 m/s | 6 |
| 2017 | 29.6°C | 26.4°C | 23.3°C | 32.4°C | 22.0°C | 133 mm | 84% | 3.2 m/s | 5.2 |
| 2016 🔥 | 32.7°C | 27.9°C | 23.0°C | 34.9°C | 20.6°C | 5 mm | 74% | 4.7 m/s | 6 |
| 2015 | 30.5°C | 27.0°C | 23.5°C | 35.6°C | 22.1°C | 120 mm | 82% | 3 m/s | 5.1 |
| 2014 | 28.9°C | 26.0°C | 23.0°C | 32.5°C | 22.0°C | 104 mm | 86% | 3.1 m/s | 5.5 |
| 2013 | 29.8°C | 26.3°C | 22.8°C | 33.8°C | 21.8°C | 70 mm | 83% | 3.9 m/s | 5.2 |
| 2012 | 31.5°C | 27.4°C | 23.3°C | 33.9°C | 22.2°C | 28 mm | 76% | 3.8 m/s | 5.9 |
| 2011 | 31.3°C | 27.2°C | 23.1°C | 35.0°C | 21.7°C | 42 mm | 77% | 4 m/s | 5.6 |
| 2010 | 31.1°C | 26.9°C | 22.8°C | 34.3°C | 20.7°C | 83 mm | 79% | 3.2 m/s | 5.5 |
| 2009 | 29.7°C | 26.4°C | 23.1°C | 32.6°C | 22.0°C | 98 mm | 84% | 3.7 m/s | 5.4 |
| 2008 | 29.1°C | 25.6°C | 22.0°C | 31.8°C | 20.1°C | 110 mm | 86% | 3 m/s | 6 |
| 2007 | 27.7°C | 25.2°C | 22.8°C | 28.9°C | 21.9°C | 177 mm | 89% | 3.4 m/s | 5.1 |
| 2006 | 27.8°C | 25.2°C | 22.6°C | 30.5°C | 21.0°C | 396 mm | 89% | 3.1 m/s | 5.2 |
| 2005 | 28.1°C | 25.4°C | 22.7°C | 29.8°C | 21.1°C | 196 mm | 89% | 3.8 m/s | 5.4 |
| 2004 | 27.4°C | 24.9°C | 22.3°C | 29.8°C | 21.4°C | 325 mm | 90% | 2.7 m/s | 5.4 |
| 2003 | 30.7°C | 26.8°C | 22.9°C | 34.5°C | 21.9°C | 14 mm | 81% | 3.4 m/s | 6.2 |
| 2002 | 32.8°C | 27.8°C | 22.8°C | 35.0°C | 21.4°C | 24 mm | 74% | 3.5 m/s | 6.3 |
| 2001 | 28.2°C | 25.3°C | 22.4°C | 31.3°C | 20.4°C | 456 mm | 89% | 3.1 m/s | 5.6 |
| 2000 | 28.1°C | 25.4°C | 22.7°C | 29.7°C | 21.7°C | 131 mm | 89% | 2.8 m/s | 5.6 |
| 1999 | 29.4°C | 26.0°C | 22.5°C | 31.7°C | 21.7°C | 38 mm | 83% | 3 m/s | 6 |
| 1998 | 27.3°C | 25.0°C | 22.7°C | 29.1°C | 21.8°C | 366 mm | 91% | 3.7 m/s | 5.5 |
| 1997 | 27.9°C | 25.2°C | 22.6°C | 30.2°C | 22.0°C | 371 mm | 89% | 3 m/s | 5.2 |
| 1996 | 27.6°C | 24.9°C | 22.2°C | 29.2°C | 21.3°C | 142 mm | 89% | 3.6 m/s | 4.5 |
| 1995 | 30.1°C | 26.5°C | 22.8°C | 32.8°C | 21.1°C | 56 mm | 82% | 3.9 m/s | 5.4 |
| 1994 | 28.2°C | 25.1°C | 22.1°C | 30.6°C | 20.4°C | 94 mm | 88% | 2.8 m/s | 5.4 |
| 1993 | 29.6°C | 26.0°C | 22.4°C | 31.9°C | 21.3°C | 38 mm | 82% | 3.3 m/s | 5.5 |
| 1992 ❄️ | 27.5°C | 24.8°C | 22.0°C | 29.0°C | 20.4°C | 107 mm | 88% | 3.1 m/s | 5.2 |
| 1991 | 29.2°C | 25.8°C | 22.3°C | 31.4°C | 21.5°C | 7 mm | 85% | 3 m/s | 5.9 |
| 1990 | 30.9°C | 26.8°C | 22.7°C | 33.1°C | 21.7°C | 33 mm | 78% | 3.6 m/s | 5.6 |
| 1989 | 27.7°C | 24.9°C | 22.2°C | 29.4°C | 21.2°C | 277 mm | 89% | 3.3 m/s | 5.1 |
| 1988 | 27.5°C | 25.1°C | 22.6°C | 28.6°C | 21.7°C | 363 mm | 90% | 3.5 m/s | 4.6 |
| 1987 | 28.7°C | 25.6°C | 22.6°C | 30.7°C | 21.6°C | 155 mm | 87% | 2.9 m/s | 5.4 |
| 1986 | 29.3°C | 25.8°C | 22.4°C | 31.8°C | 21.8°C | 62 mm | 82% | 3.6 m/s | 5.5 |
| 1985 | 29.2°C | 25.6°C | 21.9°C | 32.6°C | 21.0°C | 74 mm | 82% | 3.3 m/s | 5.4 |
| 1984 | 31.1°C | 26.6°C | 22.0°C | 33.8°C | 20.8°C | 41 mm | 77% | 3.4 m/s | 5.6 |
| 1983 | 28.3°C | 25.3°C | 22.2°C | 30.4°C | 20.7°C | 155 mm | 85% | 3.4 m/s | — |
| 1982 | 28.8°C | 25.3°C | 21.8°C | 31.0°C | 20.0°C | 21 mm | 85% | 3.1 m/s | — |
| 1981 🌧️ | 27.4°C | 24.9°C | 22.4°C | 28.9°C | 21.5°C | 502 mm | 90% | 3.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.5°C with lows near 22.7°C (mean 26.1°C), based on 45 years of NASA POWER data.
September averages 138 mm of rainfall in Tirunelveli, a relatively wet time of year. The wettest on record was 502 mm in 1981.
The hottest September reached 35.6°C in 2015. The coldest dipped to 20°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 29°C to 30.9°C and overnight lows from 22.1°C to 23.4°C over the same span.
September is close to Tirunelveli's year-round average and a relatively wet time of year, so plan for around 29.5°C daytime highs and 22.7°C at night.
Not quite — September is the 8th coolest month in Tirunelveli, averaging 26.1°C.
For September in Tirunelveli, pack light layers you can adjust through the day, with typical highs of 29.5°C and lows of 22.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 3.4 m/s. The windiest September on record averaged 4.7 m/s (2016).
The wettest September on record was 1981 with 502 mm. On average, September sees 138 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 Tirunelveli 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.
