September is one of the cooler months of the year in Kottayam, with average highs near 28.8°C and lows around 24.9°C (mean 26.9°C). It is a relatively wet time of year, averaging 270 mm of rainfall and 85% relative humidity across the period.
September is one of the cooler months of the year in Kottayam. Across 45 years of records, the warmest September in Kottayam was 2024 — when the month averaged 28.4°C — while the coldest was 1996 at 26.1°C. Typical September days reach 28.8°C with nights near 24.9°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 | 26.4°C | 26.6°C | 26.9°C | 27.1°C | 27.4°C | +1°C |
| Avg High | 28.3°C | 28.6°C | 28.8°C | 29.1°C | 29.2°C | +0.9°C |
| Avg Low | 24.5°C | 24.7°C | 25.0°C | 25.1°C | 25.6°C | +1.1°C |
| Avg Rain | 256 mm | 230 mm | 318 mm | 248 mm | 311 mm | +55 mm |
September temperatures in Kottayam have risen by about 1.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 23.9°C (1995) to a record high of 30.4°C (2024).
Rainfall in September is a relatively wet time of year, averaging 270 mm, with a wettest year of 706 mm.
A good time to visit Kottayam
September is a good time to visit Kottayam, with days averaging 28.8°C and nights around 24.9°C (mean 26.9°C, cooler than Kottayam'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 | 29.3°C | 26.0°C | 27.6°C | 238 mm | 86% | 4.3 m/s | 5.1 |
| 2024 🔥 | 30.4°C | 26.3°C | 28.4°C | 163 mm | 85% | 4.2 m/s | 5.4 |
| 2023 | 29.2°C | 25.7°C | 27.5°C | 485 mm | 83% | 3.5 m/s | 4.3 |
| 2022 | 28.6°C | 24.9°C | 26.7°C | 150 mm | 86% | 3.7 m/s | 5.6 |
| 2021 | 28.8°C | 25.3°C | 27.1°C | 309 mm | 86% | 4.1 m/s | 4.9 |
| 2020 | 28.8°C | 25.5°C | 27.1°C | 520 mm | 85% | 4 m/s | 4.3 |
| 2019 | 29.3°C | 25.7°C | 27.5°C | 401 mm | 84% | 3.5 m/s | 4.9 |
| 2018 | 29.4°C | 24.9°C | 27.1°C | 103 mm | 82% | 4 m/s | 6.1 |
| 2017 | 29.2°C | 25.0°C | 27.1°C | 374 mm | 86% | 4.1 m/s | 5.1 |
| 2016 | 28.3°C | 24.4°C | 26.3°C | 58 mm | 85% | 4.6 m/s | 5.5 |
| 2015 | 29.7°C | 25.6°C | 27.6°C | 266 mm | 84% | 3.4 m/s | 5.4 |
| 2014 | 29.8°C | 25.3°C | 27.6°C | 232 mm | 86% | 4.2 m/s | 5.3 |
| 2013 | 28.7°C | 24.8°C | 26.8°C | 218 mm | 85% | 4.3 m/s | 4.9 |
| 2012 | 28.8°C | 25.3°C | 27.1°C | 190 mm | 84% | 3.9 m/s | 5.4 |
| 2011 | 28.9°C | 25.1°C | 27.0°C | 299 mm | 85% | 4.1 m/s | 4.9 |
| 2010 | 29.1°C | 25.0°C | 27.0°C | 335 mm | 86% | 3.4 m/s | 5 |
| 2009 | 28.7°C | 24.8°C | 26.8°C | 332 mm | 86% | 4.2 m/s | 4.9 |
| 2008 | 29.0°C | 25.4°C | 27.2°C | 374 mm | 83% | 3.8 m/s | 5.5 |
| 2007 | 28.3°C | 25.1°C | 26.7°C | 597 mm | 86% | 4.3 m/s | 4.5 |
| 2006 | 28.6°C | 24.9°C | 26.7°C | 536 mm | 86% | 4.2 m/s | 4.7 |
| 2005 | 28.4°C | 24.7°C | 26.6°C | 391 mm | 88% | 4.4 m/s | 4.9 |
| 2004 | 28.4°C | 24.4°C | 26.4°C | 272 mm | 86% | 3.5 m/s | 5.1 |
| 2003 | 29.3°C | 25.4°C | 27.3°C | 58 mm | 84% | 4.2 m/s | 5.9 |
| 2002 | 29.6°C | 25.4°C | 27.5°C | 141 mm | 82% | 4.1 m/s | 6.2 |
| 2001 | 28.8°C | 25.1°C | 26.9°C | 351 mm | 85% | 4.2 m/s | 5.3 |
| 2000 | 28.5°C | 25.0°C | 26.7°C | 131 mm | 87% | 3.9 m/s | 5.1 |
| 1999 | 28.5°C | 25.1°C | 26.8°C | 41 mm | 84% | 3.8 m/s | 5.7 |
| 1998 | 28.7°C | 25.1°C | 26.9°C | 595 mm | 86% | 5.1 m/s | 4.5 |
| 1997 | 28.3°C | 24.9°C | 26.6°C | 485 mm | 86% | 3.7 m/s | 5.2 |
| 1996 ❄️ | 27.9°C | 24.4°C | 26.1°C | 327 mm | 88% | 4.3 m/s | 4.4 |
| 1995 | 28.4°C | 23.9°C | 26.2°C | 226 mm | 86% | 4.4 m/s | 5.2 |
| 1994 | 28.7°C | 24.8°C | 26.7°C | 195 mm | 85% | 4.2 m/s | 5.4 |
| 1993 | 28.9°C | 24.2°C | 26.5°C | 53 mm | 84% | 3.9 m/s | 5.2 |
| 1992 | 28.0°C | 24.6°C | 26.3°C | 293 mm | 86% | 4.4 m/s | 4.9 |
| 1991 | 29.0°C | 25.2°C | 27.1°C | 34 mm | 84% | 4.2 m/s | 5.6 |
| 1990 | 29.4°C | 24.5°C | 26.9°C | 48 mm | 82% | 4.2 m/s | 5.3 |
| 1989 | 28.1°C | 24.7°C | 26.4°C | 261 mm | 85% | 4.5 m/s | 4.7 |
| 1988 🌧️ | 28.3°C | 24.4°C | 26.4°C | 706 mm | 86% | 4.8 m/s | 4.8 |
| 1987 | 28.8°C | 24.7°C | 26.8°C | 135 mm | 84% | 4.2 m/s | 5.4 |
| 1986 | 27.9°C | 24.5°C | 26.2°C | 169 mm | 85% | 4.2 m/s | 4.9 |
| 1985 | 28.5°C | 24.2°C | 26.3°C | 93 mm | 84% | 4 m/s | 5.3 |
| 1984 | 28.4°C | 24.3°C | 26.3°C | 96 mm | 85% | 4.1 m/s | 5.6 |
| 1983 | 28.6°C | 24.3°C | 26.4°C | 280 mm | 85% | 4.3 m/s | — |
| 1982 | 28.4°C | 24.9°C | 26.7°C | 54 mm | 82% | 3.7 m/s | — |
| 1981 | 27.9°C | 24.9°C | 26.4°C | 512 mm | 87% | 4.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 28.8°C with lows near 24.9°C (mean 26.9°C), based on 45 years of NASA POWER data.
September averages 270 mm of rainfall in Kottayam, a relatively wet time of year. The wettest on record was 706 mm in 1988.
The hottest September reached 30.4°C in 2024. The coldest dipped to 23.9°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.1°C. Daytime highs moved from 28.4°C to 29.3°C and overnight lows from 24.5°C to 25.6°C over the same span.
September is one of the cooler months of the year in Kottayam and a relatively wet time of year, so plan for around 28.8°C daytime highs and 24.9°C at night.
Not quite — September is the 3rd coolest month in Kottayam, averaging 26.9°C.
For September in Kottayam, pack light layers you can adjust through the day, with typical highs of 28.8°C and lows of 24.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 4.1 m/s. The windiest September on record averaged 5.1 m/s (1998).
The wettest September on record was 1988 with 706 mm. On average, September sees 270 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 Kottayam 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.
