September is one of the warmer months of the year in Changlang, with average highs near 34°C and lows around 18.2°C (mean 26.1°C). It is a relatively wet time of year, averaging 232 mm of rainfall and 83% relative humidity across the period.
September is one of the warmer months of the year in Changlang. Across 45 years of records, the warmest Septembers in Changlang were 2008 and 2024 — when the month averaged 28.4°C — while the coldest was 1997 at 24.1°C. Typical September days reach 34°C with nights near 18.2°C. The long-term trend is warming, about 0.4°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.4°C | 25.6°C | 26.5°C | 26.2°C | 27.3°C | +1.9°C |
| Avg High | 32.7°C | 34.0°C | 34.9°C | 33.7°C | 34.8°C | +2.1°C |
| Avg Low | 18.0°C | 17.2°C | 18.1°C | 18.7°C | 19.8°C | +1.8°C |
| Avg Rain | 258 mm | 226 mm | 128 mm | 317 mm | 235 mm | -22 mm |
September temperatures in Changlang have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 14.5°C (1997) to a record high of 37.9°C (2008).
Rainfall in September is a relatively wet time of year, averaging 232 mm, with a wettest year of 478 mm.
A quieter season to visit Changlang
If your dates are flexible, the more temperate months of November and October tend to be the most comfortable for visiting Changlang. That said, September — with days averaging 34°C and nights around 18.2°C (mean 26.1°C) and higher rainfall (232 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 | 36.3°C | 20.1°C | 28.2°C | 199 mm | 85% | 0.1 m/s | 4.9 |
| 2024 | 36.1°C | 20.7°C | 28.4°C | 371 mm | 78% | 0.1 m/s | 4.9 |
| 2023 | 35.2°C | 18.7°C | 26.9°C | 142 mm | 77% | 0.2 m/s | 5.3 |
| 2022 | 32.6°C | 19.7°C | 26.2°C | 234 mm | 84% | 0.1 m/s | 3.9 |
| 2021 | 35.0°C | 18.6°C | 26.8°C | 122 mm | 82% | 0.1 m/s | 5.4 |
| 2020 | 33.5°C | 21.0°C | 27.2°C | 345 mm | 87% | 0.1 m/s | 3.7 |
| 2019 | 35.6°C | 18.0°C | 26.8°C | 356 mm | 86% | 0.1 m/s | 4.2 |
| 2018 | 33.2°C | 19.7°C | 26.5°C | 294 mm | 84% | 0.1 m/s | 3.8 |
| 2017 | 34.6°C | 19.8°C | 27.2°C | 263 mm | 86% | 0.1 m/s | 4.2 |
| 2016 | 34.8°C | 17.7°C | 26.3°C | 314 mm | 89% | 0.1 m/s | 3.9 |
| 2015 | 31.2°C | 19.6°C | 25.4°C | 193 mm | 87% | 0.1 m/s | 4.4 |
| 2014 | 33.9°C | 18.6°C | 26.3°C | 329 mm | 84% | 0.1 m/s | 4.3 |
| 2013 | 32.9°C | 18.6°C | 25.7°C | 187 mm | 86% | 0.1 m/s | 4.7 |
| 2012 | 32.5°C | 17.4°C | 24.9°C | 462 mm | 90% | 0.1 m/s | 3.6 |
| 2011 | 36.2°C | 18.4°C | 27.3°C | 305 mm | 82% | 0.2 m/s | 4.7 |
| 2010 | 32.3°C | 18.8°C | 25.5°C | 470 mm | 85% | 0.1 m/s | 4.1 |
| 2009 | 33.8°C | 18.7°C | 26.2°C | 183 mm | 81% | 0.2 m/s | 5.1 |
| 2008 🔥 | 37.9°C | 19.0°C | 28.4°C | 200 mm | 81% | 0.1 m/s | 4.8 |
| 2007 | 34.0°C | 15.3°C | 24.6°C | 164 mm | 77% | 0.2 m/s | 4.3 |
| 2006 | 35.4°C | 18.0°C | 26.7°C | 123 mm | 80% | 0.2 m/s | 4.3 |
| 2005 | 35.6°C | 19.6°C | 27.6°C | 52 mm | 72% | 0.2 m/s | 4.6 |
| 2004 | 34.3°C | 16.8°C | 25.6°C | 65 mm | 82% | 0.1 m/s | 4.2 |
| 2003 | 33.5°C | 19.2°C | 26.4°C | 118 mm | 81% | 0.2 m/s | 4.3 |
| 2002 | 34.8°C | 17.7°C | 26.3°C | 134 mm | 78% | 0.2 m/s | 4.3 |
| 2001 | 32.3°C | 20.1°C | 26.2°C | 98 mm | 82% | 0.1 m/s | 4.1 |
| 2000 | 37.3°C | 16.9°C | 27.1°C | 143 mm | 80% | 0.1 m/s | 4.3 |
| 1999 | 33.5°C | 19.5°C | 26.5°C | 85 mm | 81% | 0.1 m/s | 4.5 |
| 1998 | 34.0°C | 17.4°C | 25.7°C | 69 mm | 77% | 0.2 m/s | 5.2 |
| 1997 ❄️ | 33.6°C | 14.5°C | 24.1°C | 152 mm | 84% | 0.1 m/s | 3.7 |
| 1996 | 35.1°C | 18.1°C | 26.6°C | 64 mm | 80% | 0.1 m/s | 4.6 |
| 1995 | 36.1°C | 14.9°C | 25.5°C | 391 mm | 85% | 0.1 m/s | 4.1 |
| 1994 | 34.5°C | 18.3°C | 26.4°C | 221 mm | 79% | 0.2 m/s | 4.9 |
| 1993 | 32.6°C | 17.8°C | 25.2°C | 236 mm | 83% | 0.1 m/s | 4.2 |
| 1992 | 34.1°C | 16.9°C | 25.5°C | 316 mm | 81% | 0.1 m/s | 4.4 |
| 1991 | 31.3°C | 19.1°C | 25.2°C | 245 mm | 85% | 0.1 m/s | 3.2 |
| 1990 🌧️ | 35.1°C | 15.4°C | 25.3°C | 478 mm | 85% | 0.1 m/s | 3.5 |
| 1989 | 34.0°C | 18.6°C | 26.3°C | 315 mm | 86% | 0.1 m/s | 4.2 |
| 1988 | 31.1°C | 17.7°C | 24.4°C | 272 mm | 85% | 0.1 m/s | 3.8 |
| 1987 | 32.6°C | 18.0°C | 25.3°C | 340 mm | 87% | 0.1 m/s | 3.8 |
| 1986 | 32.4°C | 17.6°C | 25.0°C | 219 mm | 82% | 0.2 m/s | 3.8 |
| 1985 | 34.3°C | 17.2°C | 25.7°C | 198 mm | 86% | 0.1 m/s | 4.2 |
| 1984 | 32.2°C | 17.7°C | 24.9°C | 320 mm | 85% | 0.1 m/s | 4 |
| 1983 | 32.6°C | 18.6°C | 25.6°C | 245 mm | 84% | 0.1 m/s | — |
| 1982 | 33.3°C | 18.2°C | 25.8°C | 191 mm | 84% | 0.1 m/s | — |
| 1981 | 32.1°C | 18.5°C | 25.3°C | 220 mm | 84% | 0.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34°C with lows near 18.2°C (mean 26.1°C), based on 45 years of NASA POWER data.
September averages 232 mm of rainfall in Changlang, a relatively wet time of year. The wettest on record was 478 mm in 1990.
The hottest September reached 37.9°C in 2008. The coldest dipped to 14.5°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 32.9°C to 35°C and overnight lows from 18°C to 19.6°C over the same span.
September is one of the warmer months of the year in Changlang and a relatively wet time of year, so plan for around 34°C daytime highs and 18.2°C at night.
Not quite — September is the 9th coolest month in Changlang, averaging 26.1°C.
For September in Changlang, pack light, breathable clothing and sun protection, with typical highs of 34°C and lows of 18.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 83% — quite humid.
Average wind speed in September is 0.1 m/s. The windiest September on record averaged 0.2 m/s (1986).
The wettest September on record was 1990 with 478 mm. On average, September sees 232 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 Changlang 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.
