October is one of the cooler months of the year in Chennai, with average highs near 33.1°C and lows around 23°C (mean 28.1°C). It is a relatively wet time of year, averaging 233 mm of rainfall and 80% relative humidity across the period.
October is one of the cooler months of the year in Chennai. Across 45 years of records, the warmest October in Chennai was 2016 — when the month averaged 29.4°C — while the coldest was 1999 at 25.9°C. Typical October days reach 33.1°C with nights near 23°C. The long-term October temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.7°C | 28.1°C | 27.9°C | 28.4°C | 27.9°C | +0.2°C |
| Avg High | 32.6°C | 33.4°C | 33.3°C | 33.5°C | 32.8°C | +0.2°C |
| Avg Low | 22.8°C | 22.9°C | 22.7°C | 23.4°C | 23.1°C | +0.3°C |
| Avg Rain | 185 mm | 226 mm | 327 mm | 208 mm | 202 mm | +17 mm |
October temperatures in Chennai have risen by about 0.3°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 19.9°C (1999) to a record high of 35.4°C (1991).
Rainfall in October is a relatively wet time of year, averaging 233 mm, with a wettest year of 549 mm.
A quieter season to visit Chennai
If your dates are flexible, the more temperate months of January and February tend to be the most comfortable for visiting Chennai. That said, October — with days averaging 33.1°C and nights around 23°C (mean 28.1°C) and higher rainfall (233 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 32.7°C | 22.3°C | 27.5°C | 331 mm | 83% | 2.3 m/s | 4.2 |
| 2024 | 33.8°C | 23.9°C | 28.9°C | 291 mm | 81% | 1.8 m/s | 4.8 |
| 2023 | 33.0°C | 23.6°C | 28.3°C | 55 mm | 80% | 2.3 m/s | 5.1 |
| 2022 | 31.7°C | 21.3°C | 26.5°C | 195 mm | 81% | 2.6 m/s | 4.4 |
| 2021 | 32.2°C | 24.2°C | 28.2°C | 189 mm | 84% | 2.2 m/s | 4.7 |
| 2020 | 33.3°C | 23.1°C | 28.2°C | 151 mm | 81% | 2.3 m/s | 4.2 |
| 2019 | 31.5°C | 23.7°C | 27.6°C | 237 mm | 84% | 2.2 m/s | 4.7 |
| 2018 | 35.0°C | 22.4°C | 28.7°C | 151 mm | 78% | 2.7 m/s | 4.9 |
| 2017 | 32.4°C | 23.3°C | 27.8°C | 226 mm | 83% | 2.2 m/s | 4.4 |
| 2016 🔥 | 35.1°C | 23.7°C | 29.4°C | 22 mm | 68% | 2.3 m/s | 5 |
| 2015 | 32.5°C | 22.7°C | 27.6°C | 140 mm | 77% | 2.2 m/s | 5.1 |
| 2014 | 34.3°C | 23.6°C | 29.0°C | 308 mm | 81% | 2.4 m/s | 4.6 |
| 2013 | 32.5°C | 23.7°C | 28.1°C | 173 mm | 82% | 2.4 m/s | 4.5 |
| 2012 | 34.6°C | 23.6°C | 29.1°C | 354 mm | 79% | 3 m/s | 4.7 |
| 2011 | 33.1°C | 23.7°C | 28.4°C | 295 mm | 80% | 1.8 m/s | 4.9 |
| 2010 | 33.8°C | 23.6°C | 28.7°C | 178 mm | 80% | 2.2 m/s | 4.3 |
| 2009 | 34.1°C | 23.5°C | 28.8°C | 41 mm | 73% | 2.7 m/s | 5.2 |
| 2008 | 34.1°C | 20.8°C | 27.4°C | 317 mm | 78% | 2.5 m/s | 4.9 |
| 2007 | 32.4°C | 23.6°C | 28.0°C | 347 mm | 80% | 2.6 m/s | 4.4 |
| 2006 | 34.7°C | 23.9°C | 29.3°C | 476 mm | 81% | 2.6 m/s | 4.7 |
| 2005 🌧️ | 32.6°C | 23.0°C | 27.8°C | 549 mm | 85% | 2.5 m/s | 4.3 |
| 2004 | 32.1°C | 23.9°C | 28.0°C | 361 mm | 83% | 2.7 m/s | 4.5 |
| 2003 | 33.8°C | 22.1°C | 27.9°C | 230 mm | 81% | 2.4 m/s | 4.5 |
| 2002 | 33.9°C | 22.5°C | 28.2°C | 369 mm | 83% | 3.1 m/s | 4.1 |
| 2001 | 32.8°C | 22.7°C | 27.7°C | 348 mm | 83% | 2.5 m/s | 4.6 |
| 2000 | 32.0°C | 20.7°C | 26.3°C | 235 mm | 78% | 2.1 m/s | 4.6 |
| 1999 ❄️ | 32.0°C | 19.9°C | 25.9°C | 215 mm | 83% | 2.3 m/s | 4.9 |
| 1998 | 31.7°C | 22.5°C | 27.1°C | 102 mm | 82% | 2.6 m/s | 3.7 |
| 1997 | 34.4°C | 24.3°C | 29.3°C | 176 mm | 76% | 2.4 m/s | 4.6 |
| 1996 | 32.0°C | 21.1°C | 26.5°C | 308 mm | 84% | 2.7 m/s | 3.8 |
| 1995 | 32.2°C | 23.6°C | 27.9°C | 193 mm | 85% | 2.8 m/s | 3.8 |
| 1994 | 33.5°C | 24.4°C | 28.9°C | 241 mm | 80% | 2.8 m/s | 4.3 |
| 1993 | 33.6°C | 23.1°C | 28.4°C | 286 mm | 82% | 2.8 m/s | 4.1 |
| 1992 | 33.9°C | 23.6°C | 28.8°C | 101 mm | 76% | 2.3 m/s | 4.3 |
| 1991 | 35.4°C | 22.9°C | 29.1°C | 253 mm | 77% | 2.8 m/s | 4.1 |
| 1990 | 35.1°C | 23.4°C | 29.2°C | 382 mm | 80% | 3.1 m/s | 4 |
| 1989 | 32.8°C | 23.7°C | 28.2°C | 124 mm | 78% | 1.9 m/s | 4.6 |
| 1988 | 32.5°C | 22.5°C | 27.5°C | 76 mm | 74% | 2.2 m/s | 5.2 |
| 1987 | 33.7°C | 23.3°C | 28.5°C | 235 mm | 81% | 2.9 m/s | 4.7 |
| 1986 | 31.5°C | 22.7°C | 27.1°C | 257 mm | 80% | 2.4 m/s | 4.5 |
| 1985 | 33.1°C | 22.3°C | 27.7°C | 122 mm | 78% | 2.9 m/s | 4.7 |
| 1984 | 32.2°C | 22.2°C | 27.2°C | 136 mm | 79% | 2.5 m/s | 4.2 |
| 1983 | 33.1°C | 22.1°C | 27.6°C | 165 mm | 80% | 2.9 m/s | — |
| 1982 | 32.9°C | 23.8°C | 28.3°C | 195 mm | 77% | 2.6 m/s | — |
| 1981 | 31.3°C | 22.9°C | 27.1°C | 359 mm | 82% | 2.3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 33.1°C with lows near 23°C (mean 28.1°C), based on 45 years of NASA POWER data.
October averages 233 mm of rainfall in Chennai, a relatively wet time of year. The wettest on record was 549 mm in 2005.
The hottest October reached 35.4°C in 1991. The coldest dipped to 19.9°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 0.3°C. Daytime highs moved from 32.5°C to 32.7°C and overnight lows from 22.7°C to 23.1°C over the same span.
October is one of the cooler months of the year in Chennai and a relatively wet time of year, so plan for around 33.1°C daytime highs and 23°C at night.
Not quite — October is the 5th coolest month in Chennai, averaging 28.1°C.
For October in Chennai, pack light, breathable clothing and sun protection, with typical highs of 33.1°C and lows of 23°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 80% — quite humid.
Average wind speed in October is 2.5 m/s. The windiest October on record averaged 3.1 m/s (1990).
The wettest October on record was 2005 with 549 mm. On average, October sees 233 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 Chennai 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.
