October is one of the cooler months of the year in Chennai, with average highs near 30.4°C and lows around 24.9°C (mean 27.7°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°C — while the coldest was 1996 at 26.8°C. Typical October days reach 30.4°C with nights near 24.9°C. The long-term October temperature trend is broadly flat.
October is a relatively wet time of year in Chennai, averaging 233 mm of rainfall. The wettest October on record was 2005 with 549 mm, while the driest was 2016 at 22 mm.
Relative humidity in Chennai during October averages 80%. The most humid Octobers were 1995 and 2005 at 85%, and the least humid was 2016 at 68%.
October receives about 4.5 kWh/m²/day of solar energy in Chennai. The sunniest Octobers were 1988 and 2009 at 5.2 kWh/m²/day, and the cloudiest was 1998 at 3.7.
Average wind speed in Chennai during October is 2.5 m/s. The windiest Octobers were 1990 and 2002 at 3.1 m/s, while the calmest were 2011 and 2024 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.5°C | 27.6°C | 27.5°C | 27.9°C | 27.8°C | +0.3°C |
| Avg High | 30.3°C | 30.3°C | 30.2°C | 30.6°C | 30.4°C | +0.1°C |
| Avg Low | 24.6°C | 24.8°C | 24.8°C | 25.1°C | 25.1°C | +0.5°C |
| Avg Rain | 185 mm | 226 mm | 327 mm | 208 mm | 202 mm | +17 mm |
October temperatures in Chennai have risen by about 0.5°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 30.4°C and nights around 24.9°C (mean 27.7°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 | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 30.1°C | 27.6°C | 25.0°C | 32.7°C | 22.3°C | 331 mm | 83% | 2.3 m/s | 4.2 |
| 2024 | 30.9°C | 28.3°C | 25.7°C | 33.8°C | 23.9°C | 291 mm | 81% | 1.8 m/s | 4.8 |
| 2023 | 31.1°C | 28.1°C | 25.1°C | 33.0°C | 23.6°C | 55 mm | 80% | 2.3 m/s | 5.1 |
| 2022 | 29.9°C | 27.4°C | 24.8°C | 31.7°C | 21.3°C | 195 mm | 81% | 2.6 m/s | 4.4 |
| 2021 | 29.9°C | 27.7°C | 25.5°C | 32.2°C | 24.2°C | 189 mm | 84% | 2.2 m/s | 4.7 |
| 2020 | 30.5°C | 27.6°C | 24.8°C | 33.3°C | 23.1°C | 151 mm | 81% | 2.3 m/s | 4.2 |
| 2019 | 29.4°C | 27.3°C | 25.2°C | 31.5°C | 23.7°C | 237 mm | 84% | 2.2 m/s | 4.7 |
| 2018 | 30.9°C | 27.9°C | 24.9°C | 35.0°C | 22.4°C | 151 mm | 78% | 2.7 m/s | 4.9 |
| 2017 | 30.1°C | 27.7°C | 25.3°C | 32.4°C | 23.3°C | 226 mm | 83% | 2.2 m/s | 4.4 |
| 2016 🔥 | 33.1°C | 29.0°C | 24.9°C | 35.1°C | 23.7°C | 22 mm | 68% | 2.3 m/s | 5 |
| 2015 | 31.2°C | 28.0°C | 24.7°C | 32.5°C | 22.7°C | 140 mm | 77% | 2.2 m/s | 5.1 |
| 2014 | 30.3°C | 27.7°C | 25.0°C | 34.3°C | 23.6°C | 308 mm | 81% | 2.4 m/s | 4.6 |
| 2013 | 30.0°C | 27.5°C | 25.1°C | 32.5°C | 23.7°C | 173 mm | 82% | 2.4 m/s | 4.5 |
| 2012 | 30.3°C | 27.6°C | 25.0°C | 34.6°C | 23.6°C | 354 mm | 79% | 3 m/s | 4.7 |
| 2011 | 30.3°C | 27.8°C | 25.3°C | 33.1°C | 23.7°C | 295 mm | 80% | 1.8 m/s | 4.9 |
| 2010 | 30.7°C | 28.0°C | 25.2°C | 33.8°C | 23.6°C | 178 mm | 80% | 2.2 m/s | 4.3 |
| 2009 | 32.1°C | 28.5°C | 24.8°C | 34.1°C | 23.5°C | 41 mm | 73% | 2.7 m/s | 5.2 |
| 2008 | 30.4°C | 27.7°C | 24.9°C | 34.1°C | 20.8°C | 317 mm | 78% | 2.5 m/s | 4.9 |
| 2007 | 30.0°C | 27.3°C | 24.6°C | 32.4°C | 23.6°C | 347 mm | 80% | 2.6 m/s | 4.4 |
| 2006 | 30.5°C | 27.8°C | 25.1°C | 34.7°C | 23.9°C | 476 mm | 81% | 2.6 m/s | 4.7 |
| 2005 🌧️ | 29.6°C | 27.3°C | 25.0°C | 32.6°C | 23.0°C | 549 mm | 85% | 2.5 m/s | 4.3 |
| 2004 | 29.7°C | 27.3°C | 25.0°C | 32.1°C | 23.9°C | 361 mm | 83% | 2.7 m/s | 4.5 |
| 2003 | 30.5°C | 27.8°C | 25.0°C | 33.8°C | 22.1°C | 230 mm | 81% | 2.4 m/s | 4.5 |
| 2002 | 29.8°C | 27.4°C | 25.0°C | 33.9°C | 22.5°C | 369 mm | 83% | 3.1 m/s | 4.1 |
| 2001 | 29.6°C | 27.2°C | 24.8°C | 32.8°C | 22.7°C | 348 mm | 83% | 2.5 m/s | 4.6 |
| 2000 | 30.0°C | 27.0°C | 24.0°C | 32.0°C | 20.7°C | 235 mm | 78% | 2.1 m/s | 4.6 |
| 1999 | 29.5°C | 27.1°C | 24.7°C | 32.0°C | 19.9°C | 215 mm | 83% | 2.3 m/s | 4.9 |
| 1998 | 30.1°C | 27.4°C | 24.8°C | 31.7°C | 22.5°C | 102 mm | 82% | 2.6 m/s | 3.7 |
| 1997 | 31.4°C | 28.3°C | 25.3°C | 34.4°C | 24.3°C | 176 mm | 76% | 2.4 m/s | 4.6 |
| 1996 ❄️ | 29.3°C | 26.8°C | 24.3°C | 32.0°C | 21.1°C | 308 mm | 84% | 2.7 m/s | 3.8 |
| 1995 | 29.5°C | 27.1°C | 24.7°C | 32.2°C | 23.6°C | 193 mm | 85% | 2.8 m/s | 3.8 |
| 1994 | 30.4°C | 27.7°C | 25.1°C | 33.5°C | 24.4°C | 241 mm | 80% | 2.8 m/s | 4.3 |
| 1993 | 29.6°C | 27.2°C | 24.7°C | 33.6°C | 23.1°C | 286 mm | 82% | 2.8 m/s | 4.1 |
| 1992 | 30.9°C | 27.8°C | 24.6°C | 33.9°C | 23.6°C | 101 mm | 76% | 2.3 m/s | 4.3 |
| 1991 | 31.3°C | 28.2°C | 25.1°C | 35.4°C | 22.9°C | 253 mm | 77% | 2.8 m/s | 4.1 |
| 1990 | 31.0°C | 27.9°C | 24.9°C | 35.1°C | 23.4°C | 382 mm | 80% | 3.1 m/s | 4 |
| 1989 | 30.6°C | 27.8°C | 25.0°C | 32.8°C | 23.7°C | 124 mm | 78% | 1.9 m/s | 4.6 |
| 1988 | 31.0°C | 27.7°C | 24.4°C | 32.5°C | 22.5°C | 76 mm | 74% | 2.2 m/s | 5.2 |
| 1987 | 30.5°C | 27.9°C | 25.3°C | 33.7°C | 23.3°C | 235 mm | 81% | 2.9 m/s | 4.7 |
| 1986 | 29.8°C | 27.2°C | 24.5°C | 31.5°C | 22.7°C | 257 mm | 80% | 2.4 m/s | 4.5 |
| 1985 | 30.5°C | 27.4°C | 24.3°C | 33.1°C | 22.3°C | 122 mm | 78% | 2.9 m/s | 4.7 |
| 1984 | 30.1°C | 27.0°C | 23.9°C | 32.2°C | 22.2°C | 136 mm | 79% | 2.5 m/s | 4.2 |
| 1983 | 30.2°C | 27.4°C | 24.6°C | 33.1°C | 22.1°C | 165 mm | 80% | 2.9 m/s | — |
| 1982 | 30.8°C | 27.7°C | 24.7°C | 32.9°C | 23.8°C | 195 mm | 77% | 2.6 m/s | — |
| 1981 | 29.4°C | 27.0°C | 24.6°C | 31.3°C | 22.9°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 30.4°C with lows near 24.9°C (mean 27.7°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 0.5°C. Daytime highs moved from 30.2°C to 30.4°C and overnight lows from 24.4°C to 25.2°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 30.4°C daytime highs and 24.9°C at night.
Not quite — October is the 5th coolest month in Chennai, averaging 27.7°C.
For October in Chennai, pack light, breathable clothing and sun protection, with typical highs of 30.4°C and lows of 24.9°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.
