September is close to Pathanamthitta's year-round average, with average highs near 28.8°C and lows around 20.6°C (mean 24.7°C). It is a relatively wet time of year, averaging 230 mm of rainfall and 89% relative humidity across the period.
September is close to Pathanamthitta's year-round average. Across 45 years of records, the warmest September in Pathanamthitta was 2024 — when the month averaged 26°C — while the coldest were 1983 and 1992 at 23.6°C. Typical September days reach 28.8°C with nights near 20.6°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 | 24.3°C | 24.4°C | 24.9°C | 24.8°C | 25.1°C | +0.8°C |
| Avg High | 28.3°C | 28.5°C | 29.2°C | 29.1°C | 28.8°C | +0.5°C |
| Avg Low | 20.3°C | 20.3°C | 20.7°C | 20.5°C | 21.3°C | +1°C |
| Avg Rain | 235 mm | 196 mm | 272 mm | 206 mm | 245 mm | +10 mm |
September temperatures in Pathanamthitta have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 19.2°C (2011) to a record high of 30.5°C (2002).
Rainfall in September is a relatively wet time of year, averaging 230 mm, with a wettest year of 612 mm.
A good time to visit Pathanamthitta
September is a good time to visit Pathanamthitta, with days averaging 28.8°C and nights around 20.6°C (mean 24.7°C, close to Pathanamthitta'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 | 28.7°C | 22.2°C | 25.4°C | 198 mm | 91% | 0.8 m/s | 5.1 |
| 2024 🔥 | 29.6°C | 22.3°C | 26.0°C | 125 mm | 90% | 0.8 m/s | 5.4 |
| 2023 | 28.6°C | 20.8°C | 24.7°C | 366 mm | 89% | 0.7 m/s | 4.3 |
| 2022 | 29.1°C | 21.0°C | 25.0°C | 129 mm | 90% | 0.8 m/s | 5.6 |
| 2021 | 28.5°C | 21.4°C | 24.9°C | 271 mm | 91% | 0.8 m/s | 4.9 |
| 2020 | 28.5°C | 20.1°C | 24.3°C | 380 mm | 91% | 0.8 m/s | 4.3 |
| 2019 | 28.7°C | 20.4°C | 24.5°C | 324 mm | 91% | 0.7 m/s | 4.9 |
| 2018 | 30.5°C | 20.6°C | 25.5°C | 130 mm | 88% | 0.8 m/s | 6.1 |
| 2017 | 28.6°C | 21.2°C | 24.9°C | 338 mm | 91% | 0.8 m/s | 5.1 |
| 2016 | 28.4°C | 19.2°C | 23.8°C | 43 mm | 88% | 0.9 m/s | 5.5 |
| 2015 | 29.5°C | 21.1°C | 25.3°C | 236 mm | 89% | 0.7 m/s | 5.4 |
| 2014 | 29.6°C | 21.3°C | 25.4°C | 195 mm | 90% | 0.8 m/s | 5.3 |
| 2013 | 29.0°C | 20.7°C | 24.8°C | 173 mm | 90% | 0.9 m/s | 4.9 |
| 2012 | 29.2°C | 20.7°C | 24.9°C | 142 mm | 88% | 0.8 m/s | 5.4 |
| 2011 | 28.7°C | 19.2°C | 24.0°C | 219 mm | 89% | 0.8 m/s | 4.9 |
| 2010 | 28.9°C | 20.6°C | 24.8°C | 264 mm | 90% | 0.7 m/s | 5 |
| 2009 | 29.7°C | 20.9°C | 25.3°C | 255 mm | 90% | 0.8 m/s | 4.9 |
| 2008 | 28.7°C | 19.3°C | 24.0°C | 280 mm | 89% | 0.7 m/s | 5.5 |
| 2007 | 28.7°C | 20.6°C | 24.7°C | 452 mm | 92% | 0.8 m/s | 4.5 |
| 2006 | 28.4°C | 20.4°C | 24.4°C | 482 mm | 91% | 0.8 m/s | 4.7 |
| 2005 | 28.4°C | 21.4°C | 24.9°C | 326 mm | 91% | 0.9 m/s | 4.9 |
| 2004 | 28.2°C | 20.2°C | 24.2°C | 285 mm | 90% | 0.7 m/s | 5.1 |
| 2003 | 30.2°C | 21.5°C | 25.9°C | 45 mm | 87% | 0.8 m/s | 5.9 |
| 2002 | 30.5°C | 20.7°C | 25.6°C | 113 mm | 87% | 0.8 m/s | 6.2 |
| 2001 | 29.5°C | 20.7°C | 25.1°C | 364 mm | 89% | 0.8 m/s | 5.3 |
| 2000 | 29.2°C | 20.9°C | 25.1°C | 123 mm | 90% | 0.8 m/s | 5.1 |
| 1999 | 28.8°C | 20.6°C | 24.7°C | 36 mm | 87% | 0.8 m/s | 5.7 |
| 1998 | 27.6°C | 20.7°C | 24.2°C | 514 mm | 92% | 1 m/s | 4.5 |
| 1997 | 28.3°C | 21.2°C | 24.8°C | 426 mm | 90% | 0.7 m/s | 5.2 |
| 1996 | 27.5°C | 20.7°C | 24.1°C | 272 mm | 91% | 0.9 m/s | 4.4 |
| 1995 | 28.4°C | 19.8°C | 24.1°C | 178 mm | 90% | 0.9 m/s | 5.2 |
| 1994 | 30.0°C | 20.0°C | 25.0°C | 163 mm | 90% | 0.8 m/s | 5.4 |
| 1993 | 28.6°C | 20.5°C | 24.5°C | 44 mm | 87% | 0.8 m/s | 5.2 |
| 1992 | 27.8°C | 19.5°C | 23.6°C | 250 mm | 91% | 0.9 m/s | 4.9 |
| 1991 | 29.1°C | 20.8°C | 25.0°C | 31 mm | 87% | 0.8 m/s | 5.6 |
| 1990 | 29.2°C | 19.7°C | 24.4°C | 44 mm | 85% | 0.9 m/s | 5.3 |
| 1989 | 27.9°C | 20.0°C | 24.0°C | 254 mm | 90% | 0.9 m/s | 4.7 |
| 1988 🌧️ | 27.3°C | 20.6°C | 23.9°C | 612 mm | 92% | 0.9 m/s | 4.8 |
| 1987 | 28.7°C | 21.1°C | 24.9°C | 133 mm | 89% | 0.8 m/s | 5.4 |
| 1986 | 28.7°C | 20.9°C | 24.8°C | 143 mm | 88% | 0.8 m/s | 4.9 |
| 1985 | 28.8°C | 19.7°C | 24.3°C | 93 mm | 87% | 0.8 m/s | 5.3 |
| 1984 | 29.4°C | 19.8°C | 24.6°C | 83 mm | 87% | 0.8 m/s | 5.6 |
| 1983 ❄️ | 27.6°C | 19.7°C | 23.6°C | 259 mm | 89% | 0.8 m/s | — |
| 1982 | 28.6°C | 20.3°C | 24.4°C | 43 mm | 87% | 0.7 m/s | — |
| 1981 | 27.8°C | 20.8°C | 24.3°C | 498 mm | 92% | 0.8 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 20.6°C (mean 24.7°C), based on 45 years of NASA POWER data.
September averages 230 mm of rainfall in Pathanamthitta, a relatively wet time of year. The wettest on record was 612 mm in 1988.
The hottest September reached 30.5°C in 2002. The coldest dipped to 19.2°C in 2011.
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 28.4°C to 28.9°C and overnight lows from 20.1°C to 21.5°C over the same span.
September is close to Pathanamthitta's year-round average and a relatively wet time of year, so plan for around 28.8°C daytime highs and 20.6°C at night.
Not quite — September is the 6th coolest month in Pathanamthitta, averaging 24.7°C.
For September in Pathanamthitta, pack light layers you can adjust through the day, with typical highs of 28.8°C and lows of 20.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 89% — quite humid.
Average wind speed in September is 0.8 m/s. The windiest September on record averaged 1 m/s (1998).
The wettest September on record was 1988 with 612 mm. On average, September sees 230 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 Pathanamthitta 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.
