September is one of the warmer months of the year in Ariyalur, with average highs near 36.9°C and lows around 23.4°C (mean 30.2°C). It is a relatively wet time of year, averaging 119 mm of rainfall and 71% relative humidity across the period.
September is one of the warmer months of the year in Ariyalur. Across 45 years of records, the warmest September in Ariyalur was 2002 — when the month averaged 32.4°C — while the coldest was 1983 at 27.1°C. Typical September days reach 36.9°C with nights near 23.4°C. The long-term September temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 29.7°C | 30.2°C | 30.5°C | 30.3°C | 30.2°C | +0.5°C |
| Avg High | 36.5°C | 37.0°C | 37.3°C | 37.1°C | 36.7°C | +0.2°C |
| Avg Low | 22.9°C | 23.4°C | 23.8°C | 23.5°C | 23.7°C | +0.8°C |
| Avg Rain | 154 mm | 120 mm | 101 mm | 109 mm | 111 mm | -43 mm |
September temperatures in Ariyalur have risen by about 1.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 21.1°C (1983) to a record high of 40°C (2002).
Rainfall in September is a relatively wet time of year, averaging 119 mm, with a wettest year of 259 mm.
A quieter season to visit Ariyalur
If your dates are flexible, the more temperate months of January and December tend to be the most comfortable for visiting Ariyalur. That said, September — with days averaging 36.9°C and nights around 23.4°C (mean 30.2°C) and higher rainfall (119 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 37.1°C | 23.9°C | 30.5°C | 137 mm | 73% | 2.3 m/s | 5.1 |
| 2024 | 38.8°C | 24.6°C | 31.7°C | 46 mm | 65% | 2.9 m/s | 5.6 |
| 2023 | 37.2°C | 23.6°C | 30.4°C | 94 mm | 70% | 3 m/s | 5.7 |
| 2022 | 36.3°C | 23.4°C | 29.9°C | 104 mm | 76% | 2.2 m/s | 5.4 |
| 2021 | 35.1°C | 23.0°C | 29.1°C | 134 mm | 77% | 2.5 m/s | 5.3 |
| 2020 | 35.4°C | 23.5°C | 29.4°C | 151 mm | 75% | 2.9 m/s | 4.7 |
| 2019 | 37.2°C | 23.5°C | 30.4°C | 212 mm | 78% | 2.6 m/s | 5.1 |
| 2018 | 39.3°C | 23.7°C | 31.5°C | 83 mm | 65% | 2.3 m/s | 5.6 |
| 2017 | 34.8°C | 22.9°C | 28.8°C | 104 mm | 78% | 2.3 m/s | 5.2 |
| 2016 | 38.3°C | 23.7°C | 31.0°C | 41 mm | 64% | 2.6 m/s | 5.2 |
| 2015 | 37.7°C | 23.9°C | 30.8°C | 72 mm | 68% | 2.7 m/s | 5.6 |
| 2014 | 37.6°C | 24.1°C | 30.8°C | 65 mm | 66% | 2.5 m/s | 5.6 |
| 2013 | 36.2°C | 22.8°C | 29.5°C | 140 mm | 75% | 2.7 m/s | 5.6 |
| 2012 | 37.9°C | 23.8°C | 30.8°C | 120 mm | 67% | 2.6 m/s | 5.6 |
| 2011 | 36.7°C | 23.3°C | 30.0°C | 134 mm | 67% | 2.8 m/s | 5.9 |
| 2010 | 34.9°C | 23.3°C | 29.1°C | 125 mm | 75% | 2.3 m/s | 5.1 |
| 2009 | 38.3°C | 24.4°C | 31.4°C | 60 mm | 64% | 3.1 m/s | 5.7 |
| 2008 | 36.9°C | 22.9°C | 29.9°C | 31 mm | 71% | 2.7 m/s | 5.7 |
| 2007 | 35.8°C | 23.3°C | 29.6°C | 63 mm | 72% | 2.9 m/s | 5.6 |
| 2006 | 35.6°C | 23.0°C | 29.3°C | 89 mm | 76% | 3 m/s | 5.3 |
| 2005 | 37.6°C | 24.0°C | 30.8°C | 96 mm | 70% | 3 m/s | 5.5 |
| 2004 | 36.2°C | 23.6°C | 29.9°C | 255 mm | 78% | 2.3 m/s | 4.9 |
| 2003 | 37.9°C | 24.3°C | 31.1°C | 96 mm | 68% | 2.6 m/s | 5.9 |
| 2002 🔥 | 40.0°C | 24.9°C | 32.4°C | 63 mm | 60% | 2.9 m/s | 6.1 |
| 2001 | 37.4°C | 23.7°C | 30.6°C | 119 mm | 73% | 2.5 m/s | 5.6 |
| 2000 | 36.9°C | 23.8°C | 30.3°C | 140 mm | 74% | 2.3 m/s | 5.6 |
| 1999 | 38.6°C | 24.1°C | 31.3°C | 47 mm | 60% | 2.9 m/s | 5.8 |
| 1998 | 35.2°C | 23.1°C | 29.1°C | 136 mm | 78% | 3 m/s | 5.4 |
| 1997 | 37.4°C | 23.8°C | 30.6°C | 104 mm | 70% | 2.8 m/s | 5.3 |
| 1996 | 34.5°C | 23.0°C | 28.7°C | 137 mm | 80% | 2.6 m/s | 4.8 |
| 1995 | 36.6°C | 24.0°C | 30.3°C | 90 mm | 69% | 2.8 m/s | 5.2 |
| 1994 | 39.0°C | 22.4°C | 30.7°C | 84 mm | 63% | 3 m/s | 5.7 |
| 1993 | 36.9°C | 23.6°C | 30.3°C | 65 mm | 69% | 2.5 m/s | 5.3 |
| 1992 | 37.4°C | 23.3°C | 30.4°C | 197 mm | 70% | 2.6 m/s | 5.1 |
| 1991 | 35.9°C | 23.1°C | 29.5°C | 172 mm | 73% | 2.4 m/s | 5.5 |
| 1990 | 38.8°C | 23.4°C | 31.1°C | 171 mm | 70% | 2.3 m/s | 5.2 |
| 1989 | 38.2°C | 23.6°C | 30.9°C | 107 mm | 67% | 2.6 m/s | 5.1 |
| 1988 | 34.8°C | 22.1°C | 28.5°C | 176 mm | 79% | 2.8 m/s | 5.3 |
| 1987 | 38.5°C | 24.5°C | 31.5°C | 100 mm | 70% | 2.4 m/s | 5.4 |
| 1986 | 37.7°C | 23.8°C | 30.8°C | 131 mm | 69% | 2.5 m/s | 5.8 |
| 1985 | 37.5°C | 22.6°C | 30.0°C | 161 mm | 71% | 2.3 m/s | 5.5 |
| 1984 | 36.8°C | 23.0°C | 29.9°C | 151 mm | 71% | 2.4 m/s | 5.6 |
| 1983 ❄️ 🌧️ | 33.1°C | 21.1°C | 27.1°C | 259 mm | 81% | 3 m/s | — |
| 1982 | 39.0°C | 23.2°C | 31.1°C | 79 mm | 62% | 2.8 m/s | — |
| 1981 | 33.2°C | 22.3°C | 27.8°C | 222 mm | 83% | 2.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 36.9°C with lows near 23.4°C (mean 30.2°C), based on 45 years of NASA POWER data.
September averages 119 mm of rainfall in Ariyalur, a relatively wet time of year. The wettest on record was 259 mm in 1983.
The hottest September reached 40°C in 2002. The coldest dipped to 21.1°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.1°C. Daytime highs moved from 35.9°C to 36.9°C and overnight lows from 22.4°C to 23.7°C over the same span.
September is one of the warmer months of the year in Ariyalur and a relatively wet time of year, so plan for around 36.9°C daytime highs and 23.4°C at night.
Not quite — September is the 7th coolest month in Ariyalur, averaging 30.2°C.
For September in Ariyalur, pack light, breathable clothing and sun protection, with typical highs of 36.9°C and lows of 23.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 71% — moderately humid.
Average wind speed in September is 2.6 m/s. The windiest September on record averaged 3.1 m/s (2009).
The wettest September on record was 1983 with 259 mm. On average, September sees 119 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 Ariyalur 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.
