September is one of the cooler months of the year in Thiruvananthapuram, with average highs near 29°C and lows around 23.9°C (mean 26.5°C). It is a relatively wet time of year, averaging 184 mm of rainfall and 87% relative humidity across the period.
September is one of the cooler months of the year in Thiruvananthapuram. Across 45 years of records, the warmest September in Thiruvananthapuram was 2002 — when the month averaged 27.9°C — while the coldest was 1992 at 25.5°C. Typical September days reach 29°C with nights near 23.9°C. The long-term trend is warming, about 0.2°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.1°C | 26.2°C | 26.5°C | 26.6°C | 26.8°C | +0.7°C |
| Avg High | 28.7°C | 28.8°C | 29.1°C | 29.4°C | 29.2°C | +0.5°C |
| Avg Low | 23.5°C | 23.8°C | 23.9°C | 23.9°C | 24.4°C | +0.9°C |
| Avg Rain | 195 mm | 138 mm | 226 mm | 154 mm | 227 mm | +32 mm |
September temperatures in Thiruvananthapuram have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 22.6°C (1984) to a record high of 31.4°C (2002).
Rainfall in September is a relatively wet time of year, averaging 184 mm, with a wettest year of 512 mm.
A good time to visit Thiruvananthapuram
September is a good time to visit Thiruvananthapuram, with days averaging 29°C and nights around 23.9°C (mean 26.5°C, close to Thiruvananthapuram's yearly average) and higher rainfall. January and December are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 29.2°C | 24.7°C | 26.9°C | 170 mm | 89% | 3.8 m/s | 5.5 |
| 2024 | 30.1°C | 25.1°C | 27.6°C | 124 mm | 89% | 3.9 m/s | 5.7 |
| 2023 | 29.5°C | 24.7°C | 27.1°C | 324 mm | 85% | 3.6 m/s | 4.5 |
| 2022 | 29.4°C | 23.7°C | 26.5°C | 72 mm | 88% | 3.6 m/s | 5.8 |
| 2021 | 28.9°C | 24.5°C | 26.7°C | 212 mm | 89% | 4 m/s | 5.4 |
| 2020 | 28.2°C | 23.8°C | 26.0°C | 461 mm | 89% | 3.8 m/s | 4.7 |
| 2019 | 29.9°C | 24.7°C | 27.3°C | 270 mm | 87% | 3.2 m/s | 5.2 |
| 2018 | 29.4°C | 23.0°C | 26.2°C | 86 mm | 88% | 3.3 m/s | 6.1 |
| 2017 | 28.7°C | 24.0°C | 26.3°C | 268 mm | 89% | 3.6 m/s | 5.4 |
| 2016 | 29.3°C | 22.9°C | 26.1°C | 18 mm | 85% | 4.5 m/s | 6 |
| 2015 | 29.9°C | 24.3°C | 27.1°C | 225 mm | 88% | 3.2 m/s | 5.2 |
| 2014 | 29.1°C | 24.4°C | 26.7°C | 172 mm | 88% | 3.7 m/s | 5.7 |
| 2013 | 28.8°C | 23.7°C | 26.3°C | 163 mm | 88% | 4.1 m/s | 5.3 |
| 2012 | 29.5°C | 24.2°C | 26.9°C | 78 mm | 84% | 3.9 m/s | 5.9 |
| 2011 | 29.9°C | 24.1°C | 27.0°C | 118 mm | 85% | 4.1 m/s | 5.5 |
| 2010 | 29.2°C | 23.4°C | 26.3°C | 146 mm | 87% | 3.3 m/s | 5.3 |
| 2009 | 29.0°C | 23.9°C | 26.4°C | 191 mm | 89% | 3.9 m/s | 5.6 |
| 2008 | 28.7°C | 23.7°C | 26.2°C | 178 mm | 86% | 3.5 m/s | 5.9 |
| 2007 | 28.0°C | 24.2°C | 26.1°C | 285 mm | 89% | 4 m/s | 5 |
| 2006 | 28.6°C | 24.1°C | 26.4°C | 414 mm | 89% | 3.8 m/s | 5 |
| 2005 | 28.5°C | 24.0°C | 26.2°C | 218 mm | 89% | 4.3 m/s | 5.5 |
| 2004 | 28.1°C | 23.8°C | 26.0°C | 329 mm | 89% | 3.3 m/s | 5.3 |
| 2003 | 30.7°C | 24.1°C | 27.4°C | 20 mm | 84% | 4 m/s | 6.2 |
| 2002 🔥 | 31.4°C | 24.4°C | 27.9°C | 35 mm | 80% | 3.9 m/s | 6.4 |
| 2001 | 29.0°C | 23.1°C | 26.0°C | 456 mm | 88% | 3.9 m/s | 5.3 |
| 2000 | 28.8°C | 23.9°C | 26.4°C | 132 mm | 88% | 3.6 m/s | 5.4 |
| 1999 | 29.0°C | 24.3°C | 26.6°C | 38 mm | 85% | 3.6 m/s | 6.1 |
| 1998 | 27.9°C | 24.1°C | 26.0°C | 392 mm | 89% | 4.4 m/s | 5.2 |
| 1997 | 28.5°C | 24.0°C | 26.2°C | 403 mm | 89% | 3.5 m/s | 5.2 |
| 1996 | 27.8°C | 23.6°C | 25.7°C | 164 mm | 89% | 4.1 m/s | 4.5 |
| 1995 | 29.6°C | 23.4°C | 26.5°C | 76 mm | 86% | 4.3 m/s | 5.5 |
| 1994 | 28.9°C | 23.7°C | 26.3°C | 103 mm | 87% | 3.7 m/s | 5.2 |
| 1993 | 29.1°C | 23.4°C | 26.3°C | 40 mm | 85% | 3.9 m/s | 5.3 |
| 1992 ❄️ | 27.9°C | 23.1°C | 25.5°C | 125 mm | 89% | 3.8 m/s | 5.2 |
| 1991 | 29.0°C | 24.0°C | 26.5°C | 9 mm | 87% | 3.8 m/s | 5.6 |
| 1990 | 29.8°C | 23.9°C | 26.8°C | 34 mm | 82% | 4.2 m/s | 5.3 |
| 1989 | 28.4°C | 23.6°C | 26.0°C | 278 mm | 88% | 4.1 m/s | 4.8 |
| 1988 | 28.3°C | 23.9°C | 26.1°C | 400 mm | 88% | 4.3 m/s | 4.9 |
| 1987 | 29.3°C | 24.0°C | 26.6°C | 152 mm | 86% | 3.7 m/s | 5.2 |
| 1986 | 28.8°C | 23.4°C | 26.1°C | 74 mm | 86% | 3.9 m/s | 4.8 |
| 1985 | 28.9°C | 23.0°C | 26.0°C | 80 mm | 86% | 3.8 m/s | 5.5 |
| 1984 | 29.6°C | 22.6°C | 26.1°C | 44 mm | 83% | 3.7 m/s | 5.7 |
| 1983 | 28.6°C | 23.7°C | 26.2°C | 189 mm | 85% | 3.9 m/s | — |
| 1982 | 28.2°C | 23.4°C | 25.8°C | 26 mm | 87% | 3.4 m/s | — |
| 1981 🌧️ | 27.9°C | 23.9°C | 25.9°C | 512 mm | 89% | 3.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29°C with lows near 23.9°C (mean 26.5°C), based on 45 years of NASA POWER data.
September averages 184 mm of rainfall in Thiruvananthapuram, a relatively wet time of year. The wettest on record was 512 mm in 1981.
The hottest September reached 31.4°C in 2002. The coldest dipped to 22.6°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1°C. Daytime highs moved from 28.6°C to 29.4°C and overnight lows from 23.3°C to 24.5°C over the same span.
September is one of the cooler months of the year in Thiruvananthapuram and a relatively wet time of year, so plan for around 29°C daytime highs and 23.9°C at night.
Not quite — September is the 6th coolest month in Thiruvananthapuram, averaging 26.5°C.
For September in Thiruvananthapuram, pack light layers you can adjust through the day, with typical highs of 29°C and lows of 23.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 87% — quite humid.
Average wind speed in September is 3.8 m/s. The windiest September on record averaged 4.5 m/s (2016).
The wettest September on record was 1981 with 512 mm. On average, September sees 184 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 Thiruvananthapuram 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.
