September is close to Namakkal's year-round average, with average highs near 33.2°C and lows around 23°C (mean 28.1°C). It is a relatively wet time of year, averaging 111 mm of rainfall and 71% relative humidity across the period.
September is close to Namakkal's year-round average. Across 45 years of records, the warmest Septembers in Namakkal were 1999 and 2002 — when the month averaged 30°C — while the coldest was 1983 at 25.8°C. Typical September days reach 33.2°C with nights near 23°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Namakkal, averaging 111 mm of rainfall. The wettest September on record was 1983 with 275 mm, while the driest was 2016 at 13 mm.
Relative humidity in Namakkal during September averages 71%. The most humid September was 1981 at 82%, and the least humid was 1999 at 58%.
September receives about 5.4 kWh/m²/day of solar energy in Namakkal. The sunniest Septembers were 2002 and 2003 at 6.1 kWh/m²/day, and the cloudiest were 1996 and 2020 at 4.8.
Average wind speed in Namakkal during September is 2.6 m/s. The windiest September was 2016 at 3.5 m/s, while the calmest were 2004 and 2017 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.6°C | 28.2°C | 28.2°C | 28.5°C | 28.2°C | +0.6°C |
| Avg High | 32.5°C | 33.4°C | 33.3°C | 33.7°C | 33.3°C | +0.8°C |
| Avg Low | 22.6°C | 23.1°C | 23.1°C | 23.2°C | 23.2°C | +0.6°C |
| Avg Rain | 146 mm | 107 mm | 93 mm | 109 mm | 97 mm | -49 mm |
September temperatures in Namakkal have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 19.1°C (1983) to a record high of 39.2°C (1982).
Rainfall in September is a relatively wet time of year, averaging 111 mm, with a wettest year of 275 mm.
A quieter season to visit Namakkal
If your dates are flexible, the more temperate months of January and December tend to be the most comfortable for visiting Namakkal. That said, September — with days averaging 33.2°C and nights around 23°C (mean 28.1°C) and higher rainfall (111 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 34.4°C | 29.2°C | 24.1°C | 38.2°C | 22.7°C | 108 mm | 69% | 2.6 m/s | 5.3 |
| 2024 | 34.8°C | 29.2°C | 23.6°C | 38.0°C | 22.5°C | 15 mm | 69% | 3.3 m/s | 5.8 |
| 2023 | 33.9°C | 28.6°C | 23.2°C | 36.1°C | 21.5°C | 107 mm | 71% | 2.9 m/s | 5.6 |
| 2022 | 32.4°C | 27.5°C | 22.6°C | 35.0°C | 21.2°C | 81 mm | 76% | 2.3 m/s | 5.4 |
| 2021 | 32.4°C | 27.6°C | 22.8°C | 35.3°C | 21.1°C | 148 mm | 75% | 2.6 m/s | 5.3 |
| 2020 | 31.6°C | 27.2°C | 22.8°C | 34.2°C | 21.4°C | 126 mm | 77% | 2.5 m/s | 4.8 |
| 2019 | 32.3°C | 27.7°C | 23.1°C | 35.9°C | 22.0°C | 161 mm | 76% | 2.5 m/s | 5.1 |
| 2018 | 35.1°C | 29.3°C | 23.4°C | 38.9°C | 21.5°C | 125 mm | 66% | 2.2 m/s | 5.6 |
| 2017 | 31.0°C | 26.9°C | 22.8°C | 34.1°C | 20.9°C | 185 mm | 81% | 1.9 m/s | 5.2 |
| 2016 | 35.7°C | 29.7°C | 23.6°C | 38.4°C | 21.8°C | 13 mm | 60% | 3.5 m/s | 5.4 |
| 2015 | 35.0°C | 29.5°C | 24.1°C | 38.8°C | 22.4°C | 87 mm | 65% | 2.4 m/s | 5.6 |
| 2014 | 34.5°C | 29.1°C | 23.6°C | 38.1°C | 22.3°C | 73 mm | 67% | 2.8 m/s | 5.5 |
| 2013 | 32.4°C | 27.5°C | 22.6°C | 36.1°C | 20.9°C | 123 mm | 74% | 2.6 m/s | 5.6 |
| 2012 | 34.0°C | 28.6°C | 23.1°C | 36.9°C | 21.5°C | 100 mm | 68% | 2.8 m/s | 5.6 |
| 2011 | 34.1°C | 28.4°C | 22.8°C | 36.9°C | 21.1°C | 133 mm | 69% | 3.1 m/s | 5.9 |
| 2010 | 33.1°C | 27.9°C | 22.7°C | 35.4°C | 21.3°C | 90 mm | 72% | 2.5 m/s | 5.1 |
| 2009 | 34.4°C | 29.0°C | 23.6°C | 38.3°C | 22.0°C | 67 mm | 68% | 3.1 m/s | 5.7 |
| 2008 | 32.8°C | 27.5°C | 22.2°C | 36.5°C | 21.0°C | 32 mm | 73% | 2.4 m/s | 5.6 |
| 2007 | 32.9°C | 27.9°C | 22.9°C | 36.3°C | 21.4°C | 44 mm | 72% | 2.9 m/s | 5.3 |
| 2006 | 32.4°C | 27.6°C | 22.8°C | 35.6°C | 21.4°C | 77 mm | 75% | 2.6 m/s | 5.4 |
| 2005 | 33.5°C | 28.4°C | 23.3°C | 36.9°C | 22.1°C | 86 mm | 71% | 3.1 m/s | 5.5 |
| 2004 | 31.5°C | 27.2°C | 22.9°C | 37.3°C | 21.3°C | 246 mm | 77% | 1.9 m/s | 4.9 |
| 2003 | 34.7°C | 29.0°C | 23.3°C | 37.6°C | 22.1°C | 89 mm | 67% | 2.8 m/s | 6.1 |
| 2002 | 36.1°C | 30.0°C | 23.8°C | 39.2°C | 22.0°C | 44 mm | 60% | 3 m/s | 6.1 |
| 2001 | 32.3°C | 27.8°C | 23.3°C | 37.4°C | 22.3°C | 110 mm | 73% | 2.2 m/s | 5.5 |
| 2000 | 32.5°C | 27.8°C | 23.1°C | 36.3°C | 22.1°C | 136 mm | 74% | 2.2 m/s | 5.4 |
| 1999 🔥 | 35.8°C | 30.0°C | 24.1°C | 38.6°C | 22.4°C | 45 mm | 58% | 2.9 m/s | 5.9 |
| 1998 | 31.9°C | 27.3°C | 22.6°C | 36.0°C | 21.3°C | 120 mm | 76% | 2.7 m/s | 5.3 |
| 1997 | 33.5°C | 28.4°C | 23.3°C | 37.8°C | 21.6°C | 93 mm | 71% | 2.4 m/s | 5.4 |
| 1996 | 31.5°C | 26.9°C | 22.4°C | 34.2°C | 21.1°C | 117 mm | 77% | 2.7 m/s | 4.8 |
| 1995 | 33.9°C | 28.5°C | 23.1°C | 36.8°C | 21.3°C | 65 mm | 69% | 3.1 m/s | 5.3 |
| 1994 | 34.5°C | 28.8°C | 23.1°C | 38.5°C | 20.1°C | 92 mm | 64% | 2.9 m/s | 5.6 |
| 1993 | 33.9°C | 28.4°C | 22.9°C | 37.0°C | 21.5°C | 54 mm | 67% | 2.5 m/s | 5.3 |
| 1992 | 32.1°C | 27.5°C | 22.8°C | 37.0°C | 21.8°C | 186 mm | 73% | 2.6 m/s | 5.1 |
| 1991 | 32.9°C | 27.9°C | 22.9°C | 35.9°C | 21.1°C | 167 mm | 72% | 2.2 m/s | 5.6 |
| 1990 | 33.5°C | 28.4°C | 23.3°C | 38.0°C | 21.6°C | 136 mm | 67% | 2.6 m/s | 5.2 |
| 1989 | 33.3°C | 28.1°C | 22.9°C | 37.0°C | 21.4°C | 102 mm | 69% | 2.5 m/s | 5 |
| 1988 | 31.2°C | 26.8°C | 22.4°C | 34.7°C | 20.4°C | 172 mm | 79% | 2.5 m/s | 5.2 |
| 1987 | 33.7°C | 28.7°C | 23.6°C | 38.7°C | 22.2°C | 87 mm | 68% | 2.2 m/s | 5.5 |
| 1986 | 33.4°C | 28.2°C | 23.0°C | 37.1°C | 21.9°C | 139 mm | 69% | 2.6 m/s | 5.7 |
| 1985 | 32.5°C | 27.5°C | 22.5°C | 36.9°C | 20.9°C | 145 mm | 70% | 2.4 m/s | 5.3 |
| 1984 | 33.2°C | 28.0°C | 22.7°C | 36.4°C | 20.3°C | 117 mm | 69% | 2.3 m/s | 5.4 |
| 1983 ❄️ 🌧️ | 30.1°C | 25.8°C | 21.4°C | 32.8°C | 19.1°C | 275 mm | 81% | 2.5 m/s | — |
| 1982 | 34.7°C | 28.7°C | 22.7°C | 39.2°C | 20.9°C | 60 mm | 63% | 3 m/s | — |
| 1981 | 30.1°C | 26.2°C | 22.3°C | 33.0°C | 20.9°C | 216 mm | 82% | 2.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.2°C with lows near 23°C (mean 28.1°C), based on 45 years of NASA POWER data.
September averages 111 mm of rainfall in Namakkal, a relatively wet time of year. The wettest on record was 275 mm in 1983.
The hottest September reached 39.2°C in 1982. The coldest dipped to 19.1°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.2°C. Daytime highs moved from 32.1°C to 33.6°C and overnight lows from 22.3°C to 23.3°C over the same span.
September is close to Namakkal's year-round average and a relatively wet time of year, so plan for around 33.2°C daytime highs and 23°C at night.
Not quite — September is the 6th coolest month in Namakkal, averaging 28.1°C.
For September in Namakkal, pack light, breathable clothing and sun protection, with typical highs of 33.2°C and lows of 23°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 3.5 m/s (2016).
The wettest September on record was 1983 with 275 mm. On average, September sees 111 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 Namakkal 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.
