September is one of the warmer months of the year in Changlang, with average highs near 29.3°C and lows around 20.7°C (mean 25°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 September in Changlang was 2024 — when the month averaged 27.2°C — while the coldest were 1984 and 1997 at 23.5°C. Typical September days reach 29.3°C with nights near 20.7°C. The long-term trend is warming, about 0.4°C per decade.
September is a relatively wet time of year in Changlang, averaging 232 mm of rainfall. The wettest September on record was 1990 with 478 mm, while the driest was 2005 at 52 mm.
Relative humidity in Changlang during September averages 83%. The most humid September was 2012 at 90%, and the least humid was 2005 at 72%.
September receives about 4.3 kWh/m²/day of solar energy in Changlang. The sunniest September was 2021 at 5.4 kWh/m²/day, and the cloudiest was 1991 at 3.2.
Average wind speed in Changlang during September is 0.1 m/s. The windiest Septembers were 2009, 2011 and 2023, among others at 0.2 m/s, while the calmest were 2022, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.3°C | 24.7°C | 25.3°C | 24.9°C | 26.1°C | +1.8°C |
| Avg High | 28.5°C | 29.1°C | 29.9°C | 28.8°C | 30.5°C | +2°C |
| Avg Low | 20.2°C | 20.4°C | 20.6°C | 21.1°C | 21.6°C | +1.4°C |
| Avg Rain | 258 mm | 226 mm | 128 mm | 317 mm | 235 mm | -22 mm |
September temperatures in Changlang have risen by about 1.9°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 October and November tend to be the most comfortable for visiting Changlang. That said, September — with days averaging 29.3°C and nights around 20.7°C (mean 25°C) and higher rainfall (232 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 | 29.8°C | 25.7°C | 21.7°C | 36.3°C | 20.1°C | 199 mm | 85% | 0.1 m/s | 4.9 |
| 2024 🔥 | 31.7°C | 27.2°C | 22.6°C | 36.1°C | 20.7°C | 371 mm | 78% | 0.1 m/s | 4.9 |
| 2023 | 32.1°C | 26.7°C | 21.3°C | 35.2°C | 18.7°C | 142 mm | 77% | 0.2 m/s | 5.3 |
| 2022 | 29.9°C | 25.6°C | 21.3°C | 32.6°C | 19.7°C | 234 mm | 84% | 0.1 m/s | 3.9 |
| 2021 | 30.4°C | 25.7°C | 21.0°C | 35.0°C | 18.6°C | 122 mm | 82% | 0.1 m/s | 5.4 |
| 2020 | 29.3°C | 25.5°C | 21.7°C | 33.5°C | 21.0°C | 345 mm | 87% | 0.1 m/s | 3.7 |
| 2019 | 29.0°C | 25.0°C | 21.1°C | 35.6°C | 18.0°C | 356 mm | 86% | 0.1 m/s | 4.2 |
| 2018 | 29.4°C | 25.5°C | 21.6°C | 33.2°C | 19.7°C | 294 mm | 84% | 0.1 m/s | 3.8 |
| 2017 | 29.5°C | 25.6°C | 21.7°C | 34.6°C | 19.8°C | 263 mm | 86% | 0.1 m/s | 4.2 |
| 2016 | 28.2°C | 24.6°C | 20.9°C | 34.8°C | 17.7°C | 314 mm | 89% | 0.1 m/s | 3.9 |
| 2015 | 28.2°C | 24.7°C | 21.1°C | 31.2°C | 19.6°C | 193 mm | 87% | 0.1 m/s | 4.4 |
| 2014 | 29.2°C | 25.0°C | 20.9°C | 33.9°C | 18.6°C | 329 mm | 84% | 0.1 m/s | 4.3 |
| 2013 | 28.6°C | 24.7°C | 20.9°C | 32.9°C | 18.6°C | 187 mm | 86% | 0.1 m/s | 4.7 |
| 2012 | 27.3°C | 24.0°C | 20.7°C | 32.5°C | 17.4°C | 462 mm | 90% | 0.1 m/s | 3.6 |
| 2011 | 30.0°C | 25.5°C | 21.0°C | 36.2°C | 18.4°C | 305 mm | 82% | 0.2 m/s | 4.7 |
| 2010 | 29.0°C | 24.8°C | 20.7°C | 32.3°C | 18.8°C | 470 mm | 85% | 0.1 m/s | 4.1 |
| 2009 | 30.5°C | 25.6°C | 20.7°C | 33.8°C | 18.7°C | 183 mm | 81% | 0.2 m/s | 5.1 |
| 2008 | 29.8°C | 25.0°C | 20.3°C | 37.9°C | 19.0°C | 200 mm | 81% | 0.1 m/s | 4.8 |
| 2007 | 29.7°C | 24.8°C | 20.0°C | 34.0°C | 15.3°C | 164 mm | 77% | 0.2 m/s | 4.3 |
| 2006 | 29.7°C | 25.0°C | 20.4°C | 35.4°C | 18.0°C | 123 mm | 80% | 0.2 m/s | 4.3 |
| 2005 | 31.6°C | 26.6°C | 21.6°C | 35.6°C | 19.6°C | 52 mm | 72% | 0.2 m/s | 4.6 |
| 2004 | 28.7°C | 24.4°C | 20.0°C | 34.3°C | 16.8°C | 65 mm | 82% | 0.1 m/s | 4.2 |
| 2003 | 29.9°C | 25.5°C | 21.2°C | 33.5°C | 19.2°C | 118 mm | 81% | 0.2 m/s | 4.3 |
| 2002 | 30.2°C | 25.3°C | 20.5°C | 34.8°C | 17.7°C | 134 mm | 78% | 0.2 m/s | 4.3 |
| 2001 | 29.7°C | 25.4°C | 21.1°C | 32.3°C | 20.1°C | 98 mm | 82% | 0.1 m/s | 4.1 |
| 2000 | 29.6°C | 24.9°C | 20.2°C | 37.3°C | 16.9°C | 143 mm | 80% | 0.1 m/s | 4.3 |
| 1999 | 29.7°C | 25.2°C | 20.7°C | 33.5°C | 19.5°C | 85 mm | 81% | 0.1 m/s | 4.5 |
| 1998 | 30.6°C | 25.7°C | 20.9°C | 34.0°C | 17.4°C | 69 mm | 77% | 0.2 m/s | 5.2 |
| 1997 | 27.7°C | 23.5°C | 19.3°C | 33.6°C | 14.5°C | 152 mm | 84% | 0.1 m/s | 3.7 |
| 1996 | 29.3°C | 24.9°C | 20.5°C | 35.1°C | 18.1°C | 64 mm | 80% | 0.1 m/s | 4.6 |
| 1995 | 27.7°C | 23.7°C | 19.8°C | 36.1°C | 14.9°C | 391 mm | 85% | 0.1 m/s | 4.1 |
| 1994 | 30.5°C | 25.8°C | 21.1°C | 34.5°C | 18.3°C | 221 mm | 79% | 0.2 m/s | 4.9 |
| 1993 | 29.1°C | 24.6°C | 20.1°C | 32.6°C | 17.8°C | 236 mm | 83% | 0.1 m/s | 4.2 |
| 1992 | 29.4°C | 24.9°C | 20.4°C | 34.1°C | 16.9°C | 316 mm | 81% | 0.1 m/s | 4.4 |
| 1991 | 28.4°C | 24.5°C | 20.5°C | 31.3°C | 19.1°C | 245 mm | 85% | 0.1 m/s | 3.2 |
| 1990 🌧️ | 28.7°C | 24.4°C | 20.2°C | 35.1°C | 15.4°C | 478 mm | 85% | 0.1 m/s | 3.5 |
| 1989 | 28.7°C | 24.6°C | 20.5°C | 34.0°C | 18.6°C | 315 mm | 86% | 0.1 m/s | 4.2 |
| 1988 | 28.2°C | 24.3°C | 20.4°C | 31.1°C | 17.7°C | 272 mm | 85% | 0.1 m/s | 3.8 |
| 1987 | 28.2°C | 24.4°C | 20.6°C | 32.6°C | 18.0°C | 340 mm | 87% | 0.1 m/s | 3.8 |
| 1986 | 28.3°C | 24.1°C | 19.8°C | 32.4°C | 17.6°C | 219 mm | 82% | 0.2 m/s | 3.8 |
| 1985 | 28.3°C | 24.2°C | 20.1°C | 34.3°C | 17.2°C | 198 mm | 86% | 0.1 m/s | 4.2 |
| 1984 ❄️ | 27.6°C | 23.5°C | 19.4°C | 32.2°C | 17.7°C | 320 mm | 85% | 0.1 m/s | 4 |
| 1983 | 29.2°C | 24.8°C | 20.5°C | 32.6°C | 18.6°C | 245 mm | 84% | 0.1 m/s | — |
| 1982 | 28.6°C | 24.3°C | 20.1°C | 33.3°C | 18.2°C | 191 mm | 84% | 0.1 m/s | — |
| 1981 | 29.0°C | 24.7°C | 20.3°C | 32.1°C | 18.5°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 29.3°C with lows near 20.7°C (mean 25°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 1.9°C. Daytime highs moved from 28.5°C to 30.8°C and overnight lows from 20.1°C to 21.6°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 29.3°C daytime highs and 20.7°C at night.
Not quite — September is the 9th coolest month in Changlang, averaging 25°C.
For September in Changlang, pack light layers you can adjust through the day, with typical highs of 29.3°C and lows of 20.7°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.
