September is one of the cooler months of the year in Thrissur, with average highs near 29.7°C and lows around 22.8°C (mean 26.3°C). It is a relatively wet time of year, averaging 216 mm of rainfall and 89% relative humidity across the period.
September is one of the cooler months of the year in Thrissur. Across 45 years of records, the warmest September in Thrissur was 2024 — when the month averaged 27.4°C — while the coldest was 1983 at 25.3°C. Typical September days reach 29.7°C with nights near 22.8°C. The long-term trend is warming, about 0.3°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.8°C | 26.0°C | 26.2°C | 26.6°C | 26.9°C | +1.1°C |
| Avg High | 29.1°C | 29.3°C | 29.7°C | 30.2°C | 30.2°C | +1.1°C |
| Avg Low | 22.5°C | 22.7°C | 22.8°C | 22.9°C | 23.5°C | +1°C |
| Avg Rain | 199 mm | 170 mm | 242 mm | 221 mm | 265 mm | +66 mm |
September temperatures in Thrissur have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 21.6°C (1994) to a record high of 31.3°C (2002).
Rainfall in September is a relatively wet time of year, averaging 216 mm, with a wettest year of 494 mm.
A good time to visit Thrissur
September is a good time to visit Thrissur, with days averaging 29.7°C and nights around 22.8°C (mean 26.3°C, cooler than Thrissur's yearly average) and higher rainfall. December and January are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 29.9°C | 24.2°C | 27.0°C | 170 mm | 90% | 2.5 m/s | 5.1 |
| 2024 🔥 | 30.9°C | 24.0°C | 27.4°C | 148 mm | 89% | 2.3 m/s | 5.3 |
| 2023 | 30.3°C | 23.6°C | 27.0°C | 375 mm | 87% | 2 m/s | 4.4 |
| 2022 | 29.5°C | 22.8°C | 26.2°C | 202 mm | 90% | 2.1 m/s | 5.2 |
| 2021 | 30.1°C | 23.3°C | 26.7°C | 262 mm | 90% | 2.2 m/s | 4.7 |
| 2020 | 30.7°C | 23.0°C | 26.8°C | 431 mm | 90% | 2.3 m/s | 4.1 |
| 2019 | 30.2°C | 23.5°C | 26.8°C | 394 mm | 89% | 2 m/s | 4.6 |
| 2018 | 30.6°C | 22.2°C | 26.4°C | 102 mm | 87% | 2 m/s | 6 |
| 2017 | 30.8°C | 23.6°C | 27.2°C | 378 mm | 90% | 2.3 m/s | 4.9 |
| 2016 | 29.3°C | 22.0°C | 25.7°C | 55 mm | 89% | 2.5 m/s | 5 |
| 2015 | 30.8°C | 23.5°C | 27.1°C | 215 mm | 87% | 2 m/s | 5.4 |
| 2014 | 30.7°C | 23.6°C | 27.1°C | 206 mm | 89% | 2.3 m/s | 5.2 |
| 2013 | 29.9°C | 22.6°C | 26.2°C | 167 mm | 89% | 2.4 m/s | 4.8 |
| 2012 | 29.5°C | 22.9°C | 26.2°C | 142 mm | 88% | 2.3 m/s | 5.1 |
| 2011 | 29.5°C | 22.8°C | 26.1°C | 280 mm | 89% | 2.3 m/s | 4.8 |
| 2010 | 30.7°C | 22.8°C | 26.8°C | 272 mm | 89% | 1.8 m/s | 4.8 |
| 2009 | 29.7°C | 22.8°C | 26.2°C | 272 mm | 90% | 2.4 m/s | 4.6 |
| 2008 | 29.5°C | 22.3°C | 25.9°C | 314 mm | 88% | 2.1 m/s | 5.3 |
| 2007 🌧️ | 29.9°C | 22.8°C | 26.4°C | 494 mm | 91% | 2.4 m/s | 4.2 |
| 2006 | 29.3°C | 22.7°C | 26.0°C | 416 mm | 90% | 2.4 m/s | 4.4 |
| 2005 | 29.1°C | 23.3°C | 26.2°C | 268 mm | 91% | 2.7 m/s | 4.6 |
| 2004 | 29.4°C | 22.3°C | 25.8°C | 197 mm | 89% | 2 m/s | 4.9 |
| 2003 | 30.3°C | 23.1°C | 26.7°C | 47 mm | 88% | 2.3 m/s | 5.8 |
| 2002 | 31.3°C | 22.5°C | 26.9°C | 112 mm | 87% | 2.3 m/s | 6 |
| 2001 | 29.3°C | 22.7°C | 26.0°C | 194 mm | 89% | 2.3 m/s | 5.2 |
| 2000 | 29.3°C | 23.1°C | 26.2°C | 110 mm | 90% | 2.1 m/s | 5 |
| 1999 | 29.9°C | 22.9°C | 26.4°C | 41 mm | 87% | 2.1 m/s | 5.5 |
| 1998 | 29.1°C | 23.0°C | 26.1°C | 422 mm | 91% | 2.7 m/s | 4.5 |
| 1997 | 29.0°C | 23.3°C | 26.1°C | 257 mm | 89% | 2.2 m/s | 5.4 |
| 1996 | 28.1°C | 22.7°C | 25.4°C | 261 mm | 91% | 2.4 m/s | 4.7 |
| 1995 | 29.1°C | 23.2°C | 26.1°C | 185 mm | 90% | 2.6 m/s | 5.1 |
| 1994 | 29.5°C | 21.6°C | 25.5°C | 148 mm | 89% | 2.4 m/s | 5.5 |
| 1993 | 29.8°C | 22.0°C | 25.9°C | 54 mm | 87% | 2.2 m/s | 5.5 |
| 1992 | 28.6°C | 22.4°C | 25.5°C | 236 mm | 90% | 2.6 m/s | 4.8 |
| 1991 | 30.0°C | 22.6°C | 26.3°C | 38 mm | 87% | 2.3 m/s | 5.5 |
| 1990 | 29.7°C | 22.8°C | 26.2°C | 64 mm | 87% | 2.3 m/s | 5.6 |
| 1989 | 28.9°C | 22.8°C | 25.8°C | 194 mm | 89% | 2.5 m/s | 5.2 |
| 1988 | 28.7°C | 22.8°C | 25.7°C | 430 mm | 90% | 2.7 m/s | 4.8 |
| 1987 | 29.8°C | 22.8°C | 26.3°C | 77 mm | 88% | 2.3 m/s | 5.5 |
| 1986 | 29.2°C | 22.6°C | 25.9°C | 162 mm | 88% | 2.4 m/s | 5.1 |
| 1985 | 29.4°C | 22.0°C | 25.7°C | 98 mm | 88% | 2.2 m/s | 5.3 |
| 1984 | 29.8°C | 22.1°C | 25.9°C | 110 mm | 88% | 2.2 m/s | 5.3 |
| 1983 ❄️ | 28.6°C | 21.9°C | 25.3°C | 293 mm | 90% | 2.5 m/s | — |
| 1982 | 29.2°C | 22.4°C | 25.8°C | 74 mm | 87% | 2.1 m/s | — |
| 1981 | 28.4°C | 22.7°C | 25.6°C | 355 mm | 91% | 2.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.7°C with lows near 22.8°C (mean 26.3°C), based on 45 years of NASA POWER data.
September averages 216 mm of rainfall in Thrissur, a relatively wet time of year. The wettest on record was 494 mm in 2007.
The hottest September reached 31.3°C in 2002. The coldest dipped to 21.6°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.2°C. Daytime highs moved from 29.1°C to 30.1°C and overnight lows from 22.2°C to 23.6°C over the same span.
September is one of the cooler months of the year in Thrissur and a relatively wet time of year, so plan for around 29.7°C daytime highs and 22.8°C at night.
Not quite — September is the 5th coolest month in Thrissur, averaging 26.3°C.
For September in Thrissur, pack light layers you can adjust through the day, with typical highs of 29.7°C and lows of 22.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 89% — quite humid.
Average wind speed in September is 2.3 m/s. The windiest September on record averaged 2.7 m/s (1988).
The wettest September on record was 2007 with 494 mm. On average, September sees 216 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 Thrissur 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.
