September is one of the warmer months of the year in Nagapattinam, with average highs near 33°C and lows around 25.7°C (mean 29.4°C). It is a relatively wet time of year, averaging 100 mm of rainfall and 76% relative humidity across the period.
September is one of the warmer months of the year in Nagapattinam. Across 45 years of records, the warmest September in Nagapattinam was 2002 — when the month averaged 30.6°C — while the coldest was 1983 at 27.7°C. Typical September days reach 33°C with nights near 25.7°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 | 29.0°C | 29.3°C | 29.6°C | 29.4°C | 29.5°C | +0.5°C |
| Avg High | 32.8°C | 33.0°C | 33.3°C | 33.0°C | 32.9°C | +0.1°C |
| Avg Low | 25.2°C | 25.6°C | 25.9°C | 25.8°C | 26.1°C | +0.9°C |
| Avg Rain | 120 mm | 87 mm | 85 mm | 101 mm | 118 mm | -1 mm |
September temperatures in Nagapattinam have risen by about 0.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 24.3°C (1983) to a record high of 34.5°C (2002).
Rainfall in September is a relatively wet time of year, averaging 100 mm, with a wettest year of 198 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
A quieter season to visit Nagapattinam
If your dates are flexible, the more temperate months of January and February tend to be the most comfortable for visiting Nagapattinam. That said, September — with days averaging 33°C and nights around 25.7°C (mean 29.4°C) and higher rainfall (100 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 | 32.9°C | 26.3°C | 29.6°C | 155 mm | 77% | 3.5 m/s | 5.3 |
| 2024 | 34.1°C | 26.7°C | 30.4°C | 58 mm | 73% | 3.8 m/s | 5.9 |
| 2023 | 33.0°C | 26.0°C | 29.5°C | 89 mm | 76% | 4.7 m/s | 5.7 |
| 2022 | 33.0°C | 26.2°C | 29.6°C | 97 mm | 78% | 3.6 m/s | 5.7 |
| 2021 | 31.9°C | 25.6°C | 28.8°C | 128 mm | 79% | 3.9 m/s | 5.5 |
| 2020 | 32.3°C | 25.7°C | 29.0°C | 181 mm | 78% | 4.4 m/s | 4.8 |
| 2019 🌧️ | 33.2°C | 25.9°C | 29.5°C | 198 mm | 80% | 4.2 m/s | 5.4 |
| 2018 | 33.9°C | 25.9°C | 29.9°C | 73 mm | 73% | 3.5 m/s | 5.8 |
| 2017 | 32.2°C | 25.7°C | 29.0°C | 117 mm | 79% | 3.7 m/s | 5.4 |
| 2016 | 33.8°C | 25.9°C | 29.8°C | 68 mm | 73% | 3.8 m/s | 5.8 |
| 2015 | 33.3°C | 26.2°C | 29.7°C | 86 mm | 76% | 4.2 m/s | 5.7 |
| 2014 | 32.6°C | 26.1°C | 29.4°C | 65 mm | 74% | 3.6 m/s | 5.9 |
| 2013 | 33.0°C | 25.3°C | 29.1°C | 113 mm | 78% | 4.3 m/s | 5.7 |
| 2012 | 33.1°C | 25.8°C | 29.5°C | 98 mm | 74% | 3.9 m/s | 5.7 |
| 2011 | 32.7°C | 25.7°C | 29.2°C | 77 mm | 73% | 4 m/s | 5.9 |
| 2010 | 32.2°C | 25.7°C | 28.9°C | 113 mm | 77% | 3.5 m/s | 5.3 |
| 2009 | 34.1°C | 26.1°C | 30.1°C | 57 mm | 72% | 4.5 m/s | 5.9 |
| 2008 | 33.0°C | 25.6°C | 29.3°C | 40 mm | 74% | 4.3 m/s | 5.8 |
| 2007 | 32.7°C | 25.8°C | 29.2°C | 83 mm | 77% | 4.2 m/s | 5.7 |
| 2006 | 32.4°C | 25.1°C | 28.8°C | 85 mm | 78% | 4.7 m/s | 5.4 |
| 2005 | 33.3°C | 26.2°C | 29.8°C | 90 mm | 76% | 4.3 m/s | 5.7 |
| 2004 | 32.1°C | 25.7°C | 28.9°C | 191 mm | 80% | 3.7 m/s | 5 |
| 2003 | 33.5°C | 26.3°C | 29.9°C | 51 mm | 74% | 4 m/s | 6 |
| 2002 🔥 | 34.5°C | 26.7°C | 30.6°C | 39 mm | 70% | 4.2 m/s | 6.1 |
| 2001 | 33.7°C | 25.5°C | 29.6°C | 104 mm | 76% | 4 m/s | 5.6 |
| 2000 | 33.4°C | 26.0°C | 29.7°C | 109 mm | 78% | 3.7 m/s | 5.5 |
| 1999 | 33.2°C | 25.7°C | 29.4°C | 51 mm | 73% | 4.2 m/s | 5.9 |
| 1998 | 31.9°C | 25.1°C | 28.5°C | 115 mm | 81% | 4.4 m/s | 5.4 |
| 1997 | 33.3°C | 26.3°C | 29.8°C | 88 mm | 76% | 4.4 m/s | 5.5 |
| 1996 | 31.7°C | 24.9°C | 28.3°C | 119 mm | 82% | 4 m/s | 4.9 |
| 1995 | 33.5°C | 25.9°C | 29.7°C | 73 mm | 75% | 4.1 m/s | 5.4 |
| 1994 | 33.6°C | 24.9°C | 29.3°C | 41 mm | 72% | 4.3 m/s | 5.6 |
| 1993 | 33.0°C | 25.7°C | 29.3°C | 56 mm | 74% | 3.9 m/s | 5.5 |
| 1992 | 33.6°C | 25.5°C | 29.5°C | 119 mm | 75% | 3.8 m/s | 5.3 |
| 1991 | 33.0°C | 25.7°C | 29.3°C | 94 mm | 74% | 3.9 m/s | 5.6 |
| 1990 | 33.3°C | 26.1°C | 29.7°C | 108 mm | 74% | 3.5 m/s | 5.4 |
| 1989 | 33.7°C | 25.7°C | 29.7°C | 94 mm | 73% | 3.8 m/s | 5.3 |
| 1988 | 32.6°C | 25.3°C | 28.9°C | 123 mm | 80% | 4.3 m/s | 5.3 |
| 1987 | 33.3°C | 25.5°C | 29.4°C | 59 mm | 75% | 3.9 m/s | 5.3 |
| 1986 | 33.7°C | 25.9°C | 29.8°C | 90 mm | 74% | 4 m/s | 5.9 |
| 1985 | 33.6°C | 25.0°C | 29.3°C | 110 mm | 74% | 3.7 m/s | 5.5 |
| 1984 | 32.8°C | 25.1°C | 28.9°C | 181 mm | 75% | 3.8 m/s | 5.6 |
| 1983 ❄️ | 31.1°C | 24.3°C | 27.7°C | 173 mm | 81% | 4.9 m/s | — |
| 1982 | 33.5°C | 25.8°C | 29.7°C | 65 mm | 70% | 4.2 m/s | — |
| 1981 | 31.1°C | 24.6°C | 27.9°C | 182 mm | 82% | 3.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33°C with lows near 25.7°C (mean 29.4°C), based on 45 years of NASA POWER data.
September averages 100 mm of rainfall in Nagapattinam, a relatively wet time of year. The wettest on record was 198 mm in 2019.
The hottest September reached 34.5°C in 2002. The coldest dipped to 24.3°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.9°C. Daytime highs moved from 32.4°C to 33°C and overnight lows from 25°C to 26.2°C over the same span.
September is one of the warmer months of the year in Nagapattinam and a relatively wet time of year, so plan for around 33°C daytime highs and 25.7°C at night.
Not quite — September is the 7th coolest month in Nagapattinam, averaging 29.4°C.
For September in Nagapattinam, pack light, breathable clothing and sun protection, with typical highs of 33°C and lows of 25.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 76% — quite humid.
Average wind speed in September is 4 m/s. The windiest September on record averaged 4.9 m/s (1983).
The wettest September on record was 2019 with 198 mm. On average, September sees 100 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 Nagapattinam 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.
