October is one of the cooler months of the year in Theni, with average highs near 27.6°C and lows around 19.6°C (mean 23.6°C). It is a relatively wet time of year, averaging 203 mm of rainfall and 84% relative humidity across the period.
October is one of the cooler months of the year in Theni. Across 45 years of records, the warmest Octobers in Theni were 2009 and 2016 — when the month averaged 25.4°C — while the coldest was 1984 at 22.3°C. Typical October days reach 27.6°C with nights near 19.6°C. The long-term trend is warming, about 0.2°C per decade.
October is a relatively wet time of year in Theni, averaging 203 mm of rainfall. The wettest October on record was 1999 with 384 mm, while the driest was 1988 at 34 mm.
Relative humidity in Theni during October averages 84%. The most humid October was 1999 at 89%, and the least humid was 2009 at 72%.
October receives about 4.8 kWh/m²/day of solar energy in Theni. The sunniest Octobers were 2009 and 2016 at 5.4 kWh/m²/day, and the cloudiest was 1993 at 4.
Average wind speed in Theni during October is 1.1 m/s. The windiest Octobers were 1990, 1998 and 2009, among others at 1.4 m/s, while the calmest were 2005, 2019 and 2024, among others at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.3°C | 23.2°C | 23.6°C | 24.0°C | 23.9°C | +0.6°C |
| Avg High | 27.5°C | 27.0°C | 27.5°C | 28.1°C | 27.7°C | +0.2°C |
| Avg Low | 19.1°C | 19.4°C | 19.6°C | 19.9°C | 20.0°C | +0.9°C |
| Avg Rain | 140 mm | 226 mm | 242 mm | 174 mm | 240 mm | +101 mm |
October temperatures in Theni have risen by about 0.8°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 12.1°C (1984) to a record high of 35.5°C (2012).
Rainfall in October is a relatively wet time of year, averaging 203 mm, with a wettest year of 384 mm.
A quieter season to visit Theni
If your dates are flexible, the more temperate months of January and December tend to be the most comfortable for visiting Theni. That said, October — with days averaging 27.6°C and nights around 19.6°C (mean 23.6°C) and higher rainfall (203 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 27.9°C | 24.2°C | 20.5°C | 31.8°C | 18.7°C | 199 mm | 84% | 1.2 m/s | 4.5 |
| 2024 | 27.9°C | 24.1°C | 20.3°C | 29.5°C | 17.8°C | 260 mm | 85% | 0.9 m/s | 4.6 |
| 2023 | 28.5°C | 24.5°C | 20.4°C | 32.2°C | 18.7°C | 179 mm | 83% | 1 m/s | 4.7 |
| 2022 | 27.2°C | 23.3°C | 19.3°C | 29.5°C | 17.5°C | 207 mm | 84% | 1 m/s | 4.7 |
| 2021 | 26.9°C | 23.5°C | 20.2°C | 29.3°C | 18.7°C | 253 mm | 87% | 1.2 m/s | 4.2 |
| 2020 | 28.0°C | 23.7°C | 19.4°C | 31.4°C | 17.7°C | 343 mm | 82% | 1.3 m/s | 5 |
| 2019 | 26.5°C | 23.3°C | 20.1°C | 29.9°C | 18.6°C | 321 mm | 87% | 0.9 m/s | 4.5 |
| 2018 | 27.4°C | 23.7°C | 19.9°C | 30.0°C | 17.7°C | 161 mm | 82% | 1 m/s | 4.7 |
| 2017 | 27.1°C | 23.6°C | 20.0°C | 29.4°C | 18.7°C | 115 mm | 86% | 1.1 m/s | 4.9 |
| 2016 | 30.9°C | 25.4°C | 19.9°C | 34.4°C | 18.4°C | 87 mm | 73% | 1.1 m/s | 5.4 |
| 2015 | 28.3°C | 24.0°C | 19.8°C | 30.6°C | 18.2°C | 115 mm | 81% | 1.2 m/s | 5 |
| 2014 | 27.4°C | 23.6°C | 19.9°C | 30.7°C | 17.8°C | 198 mm | 84% | 1 m/s | 4.6 |
| 2013 | 28.9°C | 24.2°C | 19.6°C | 32.9°C | 16.0°C | 154 mm | 80% | 1.2 m/s | 5.3 |
| 2012 | 28.6°C | 24.2°C | 19.7°C | 35.5°C | 17.6°C | 198 mm | 81% | 1.3 m/s | 4.9 |
| 2011 | 28.2°C | 24.1°C | 20.0°C | 32.5°C | 18.6°C | 194 mm | 81% | 1 m/s | 5.1 |
| 2010 | 27.8°C | 23.7°C | 19.6°C | 29.9°C | 17.4°C | 201 mm | 85% | 1.2 m/s | 5 |
| 2009 🔥 | 30.8°C | 25.4°C | 20.0°C | 32.7°C | 17.8°C | 57 mm | 72% | 1.4 m/s | 5.4 |
| 2008 | 28.2°C | 23.9°C | 19.6°C | 32.6°C | 17.1°C | 189 mm | 80% | 1.1 m/s | 4.7 |
| 2007 | 27.0°C | 23.0°C | 19.0°C | 30.4°C | 17.0°C | 206 mm | 85% | 1.2 m/s | 4.7 |
| 2006 | 26.7°C | 23.0°C | 19.4°C | 29.8°C | 17.4°C | 341 mm | 88% | 1.3 m/s | 4.7 |
| 2005 | 27.3°C | 23.6°C | 19.9°C | 30.3°C | 17.7°C | 346 mm | 86% | 0.9 m/s | 5.1 |
| 2004 | 26.2°C | 22.9°C | 19.5°C | 29.2°C | 16.0°C | 304 mm | 88% | 1.3 m/s | 4.8 |
| 2003 | 26.9°C | 23.5°C | 20.0°C | 29.3°C | 16.9°C | 335 mm | 86% | 1.1 m/s | 4.9 |
| 2002 | 27.6°C | 23.9°C | 20.2°C | 32.7°C | 17.7°C | 305 mm | 84% | 1.1 m/s | 4.6 |
| 2001 | 26.7°C | 23.2°C | 19.6°C | 28.9°C | 18.2°C | 206 mm | 87% | 1.2 m/s | 4.8 |
| 2000 | 27.5°C | 23.1°C | 18.8°C | 29.6°C | 15.5°C | 132 mm | 82% | 1.1 m/s | 5.3 |
| 1999 🌧️ | 26.2°C | 23.1°C | 20.1°C | 28.8°C | 18.1°C | 384 mm | 89% | 0.9 m/s | 4.5 |
| 1998 | 26.4°C | 22.8°C | 19.1°C | 28.7°C | 17.0°C | 221 mm | 87% | 1.4 m/s | 4.8 |
| 1997 | 27.2°C | 23.6°C | 20.0°C | 29.3°C | 18.8°C | 169 mm | 86% | 0.9 m/s | 4.6 |
| 1996 | 26.8°C | 22.6°C | 18.3°C | 28.8°C | 14.6°C | 174 mm | 86% | 1.3 m/s | 4.4 |
| 1995 | 28.1°C | 23.8°C | 19.5°C | 30.8°C | 17.3°C | 130 mm | 82% | 1.2 m/s | 4.6 |
| 1994 | 26.3°C | 22.9°C | 19.5°C | 28.3°C | 17.7°C | 331 mm | 88% | 1 m/s | 4.7 |
| 1993 | 26.5°C | 23.1°C | 19.6°C | 28.7°C | 18.2°C | 301 mm | 87% | 1.2 m/s | 4 |
| 1992 | 26.7°C | 22.9°C | 19.1°C | 28.6°C | 17.1°C | 177 mm | 85% | 1 m/s | 4.5 |
| 1991 | 26.5°C | 23.0°C | 19.5°C | 28.9°C | 17.4°C | 196 mm | 86% | 1.1 m/s | 4.5 |
| 1990 | 29.5°C | 24.6°C | 19.6°C | 33.2°C | 17.9°C | 182 mm | 78% | 1.4 m/s | 4.7 |
| 1989 | 26.9°C | 23.3°C | 19.7°C | 29.2°C | 18.2°C | 180 mm | 86% | 1 m/s | 4.8 |
| 1988 | 27.4°C | 23.3°C | 19.2°C | 28.7°C | 17.6°C | 34 mm | 84% | 1 m/s | 5 |
| 1987 | 26.8°C | 23.5°C | 20.2°C | 29.7°C | 18.4°C | 196 mm | 87% | 0.9 m/s | 4.5 |
| 1986 | 28.8°C | 24.1°C | 19.4°C | 31.3°C | 17.7°C | 83 mm | 78% | 1.1 m/s | 4.8 |
| 1985 | 28.1°C | 23.2°C | 18.3°C | 30.2°C | 14.4°C | 92 mm | 80% | 1.4 m/s | 5.1 |
| 1984 ❄️ | 26.9°C | 22.3°C | 17.7°C | 29.5°C | 12.1°C | 226 mm | 83% | 1.2 m/s | 4.7 |
| 1983 | 28.1°C | 23.6°C | 19.2°C | 30.4°C | 17.9°C | 74 mm | 81% | 1.2 m/s | — |
| 1982 | 27.9°C | 23.4°C | 19.0°C | 30.7°C | 15.7°C | 97 mm | 80% | 1 m/s | — |
| 1981 | 26.3°C | 22.8°C | 19.2°C | 28.6°C | 17.0°C | 273 mm | 88% | 0.9 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 27.6°C with lows near 19.6°C (mean 23.6°C), based on 45 years of NASA POWER data.
October averages 203 mm of rainfall in Theni, a relatively wet time of year. The wettest on record was 384 mm in 1999.
The hottest October reached 35.5°C in 2012. The coldest dipped to 12.1°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 0.8°C. Daytime highs moved from 27.5°C to 27.7°C and overnight lows from 18.7°C to 20.1°C over the same span.
October is one of the cooler months of the year in Theni and a relatively wet time of year, so plan for around 27.6°C daytime highs and 19.6°C at night.
Not quite — October is the 4th coolest month in Theni, averaging 23.6°C.
For October in Theni, pack light layers you can adjust through the day, with typical highs of 27.6°C and lows of 19.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 84% — quite humid.
Average wind speed in October is 1.1 m/s. The windiest October on record averaged 1.4 m/s (1985).
The wettest October on record was 1999 with 384 mm. On average, October sees 203 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 Theni behaves each October, 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 October specifically, along with year-by-year records and how the month has changed over the decades.
