September is one of the warmer months of the year in Upper Subansiri, with average highs near 29.9°C and lows around 16.2°C (mean 23°C). It is a relatively wet time of year, averaging 335 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Upper Subansiri. Across 45 years of records, the warmest September in Upper Subansiri was 2024 — when the month averaged 26.1°C — while the coldest were 1984, 1986 and 1987 at 21.3°C. Typical September days reach 29.9°C with nights near 16.2°C. The long-term trend is warming, about 0.5°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.3°C | 22.8°C | 22.9°C | 23.3°C | 24.4°C | +2.1°C |
| Avg High | 29.1°C | 30.0°C | 29.8°C | 30.0°C | 31.0°C | +1.9°C |
| Avg Low | 15.4°C | 15.6°C | 16.0°C | 16.7°C | 17.8°C | +2.4°C |
| Avg Rain | 337 mm | 334 mm | 264 mm | 416 mm | 318 mm | -19 mm |
September temperatures in Upper Subansiri have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 13.2°C (1997) to a record high of 33.6°C (2024).
Rainfall in September is a relatively wet time of year, averaging 335 mm, with a wettest year of 590 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.6°C per decade, narrowing the gap between day and night.
A good time to visit Upper Subansiri
September is a good time to visit Upper Subansiri, with days averaging 29.9°C and nights around 16.2°C (mean 23°C, warmer than Upper Subansiri's yearly average) and higher rainfall. October and November are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 30.9°C | 19.1°C | 25.0°C | 303 mm | 86% | 0.3 m/s | 4 |
| 2024 🔥 | 33.6°C | 18.5°C | 26.1°C | 260 mm | 81% | 0.4 m/s | 4.6 |
| 2023 | 32.9°C | 17.3°C | 25.1°C | 173 mm | 79% | 0.4 m/s | 4.3 |
| 2022 | 29.2°C | 16.1°C | 22.6°C | 387 mm | 88% | 0.3 m/s | 3.1 |
| 2021 | 29.8°C | 17.2°C | 23.5°C | 192 mm | 83% | 0.4 m/s | 4.4 |
| 2020 🌧️ | 29.5°C | 18.8°C | 24.1°C | 590 mm | 90% | 0.3 m/s | 2.9 |
| 2019 | 30.6°C | 14.9°C | 22.8°C | 465 mm | 88% | 0.3 m/s | 3.1 |
| 2018 | 30.3°C | 18.1°C | 24.2°C | 454 mm | 89% | 0.3 m/s | 3.3 |
| 2017 | 30.7°C | 18.5°C | 24.6°C | 375 mm | 89% | 0.3 m/s | 3.3 |
| 2016 | 29.5°C | 17.4°C | 23.5°C | 542 mm | 89% | 0.3 m/s | 2.9 |
| 2015 | 28.5°C | 18.3°C | 23.4°C | 323 mm | 89% | 0.3 m/s | 3.3 |
| 2014 | 30.0°C | 16.5°C | 23.2°C | 378 mm | 86% | 0.3 m/s | 3.8 |
| 2013 | 29.9°C | 16.2°C | 23.1°C | 241 mm | 86% | 0.4 m/s | 3.9 |
| 2012 | 30.1°C | 17.0°C | 23.5°C | 506 mm | 89% | 0.4 m/s | 3.8 |
| 2011 | 31.0°C | 15.4°C | 23.2°C | 353 mm | 84% | 0.3 m/s | 4 |
| 2010 | 29.3°C | 14.5°C | 21.9°C | 526 mm | 86% | 0.3 m/s | 3.3 |
| 2009 | 29.8°C | 16.0°C | 22.9°C | 185 mm | 81% | 0.4 m/s | 4.6 |
| 2008 | 28.6°C | 16.5°C | 22.6°C | 235 mm | 82% | 0.4 m/s | 4 |
| 2007 | 29.1°C | 14.8°C | 21.9°C | 381 mm | 81% | 0.4 m/s | 4.2 |
| 2006 | 31.4°C | 16.7°C | 24.1°C | 269 mm | 83% | 0.4 m/s | 3.7 |
| 2005 | 30.4°C | 16.7°C | 23.6°C | 150 mm | 79% | 0.4 m/s | 4.5 |
| 2004 | 28.8°C | 15.8°C | 22.3°C | 188 mm | 84% | 0.3 m/s | 3.7 |
| 2003 | 29.3°C | 17.4°C | 23.4°C | 323 mm | 85% | 0.3 m/s | 3 |
| 2002 | 30.3°C | 14.8°C | 22.5°C | 255 mm | 81% | 0.4 m/s | 3.8 |
| 2001 | 28.9°C | 16.9°C | 22.9°C | 253 mm | 84% | 0.4 m/s | 3.4 |
| 2000 | 31.0°C | 14.4°C | 22.7°C | 399 mm | 85% | 0.3 m/s | 3.7 |
| 1999 | 29.4°C | 17.7°C | 23.5°C | 268 mm | 82% | 0.4 m/s | 4.3 |
| 1998 | 30.3°C | 16.5°C | 23.4°C | 140 mm | 80% | 0.4 m/s | 4.7 |
| 1997 | 29.6°C | 13.2°C | 21.4°C | 274 mm | 86% | 0.3 m/s | 4 |
| 1996 | 30.3°C | 16.8°C | 23.6°C | 167 mm | 84% | 0.3 m/s | 3.5 |
| 1995 | 31.1°C | 15.8°C | 23.4°C | 447 mm | 86% | 0.3 m/s | 3.9 |
| 1994 | 30.0°C | 14.5°C | 22.2°C | 318 mm | 82% | 0.4 m/s | 3.9 |
| 1993 | 29.4°C | 16.2°C | 22.8°C | 431 mm | 86% | 0.3 m/s | 3.6 |
| 1992 | 30.5°C | 14.3°C | 22.4°C | 249 mm | 82% | 0.4 m/s | 3.2 |
| 1991 | 28.4°C | 16.6°C | 22.5°C | 482 mm | 88% | 0.3 m/s | 3 |
| 1990 | 30.8°C | 14.2°C | 22.5°C | 566 mm | 87% | 0.3 m/s | 2.9 |
| 1989 | 27.6°C | 16.5°C | 22.1°C | 361 mm | 88% | 0.3 m/s | 3.5 |
| 1988 | 29.4°C | 16.9°C | 23.2°C | 338 mm | 88% | 0.3 m/s | 2.6 |
| 1987 | 27.7°C | 15.0°C | 21.3°C | 472 mm | 89% | 0.3 m/s | 3.1 |
| 1986 | 28.2°C | 14.5°C | 21.3°C | 353 mm | 86% | 0.3 m/s | 2.8 |
| 1985 | 30.3°C | 16.5°C | 23.4°C | 309 mm | 89% | 0.3 m/s | 3.1 |
| 1984 ❄️ | 29.1°C | 13.4°C | 21.3°C | 342 mm | 87% | 0.3 m/s | 3 |
| 1983 | 28.7°C | 14.4°C | 21.5°C | 384 mm | 87% | 0.3 m/s | — |
| 1982 | 32.1°C | 15.6°C | 23.8°C | 239 mm | 85% | 0.4 m/s | — |
| 1981 | 28.9°C | 16.1°C | 22.5°C | 234 mm | 86% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.9°C with lows near 16.2°C (mean 23°C), based on 45 years of NASA POWER data.
September averages 335 mm of rainfall in Upper Subansiri, a relatively wet time of year. The wettest on record was 590 mm in 2020.
The hottest September reached 33.6°C in 2024. The coldest dipped to 13.2°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2°C. Daytime highs moved from 29.8°C to 31.3°C and overnight lows from 15.2°C to 17.6°C over the same span.
September is one of the warmer months of the year in Upper Subansiri and a relatively wet time of year, so plan for around 29.9°C daytime highs and 16.2°C at night.
Not quite — September is the 9th coolest month in Upper Subansiri, averaging 23°C.
For September in Upper Subansiri, pack light layers you can adjust through the day, with typical highs of 29.9°C and lows of 16.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 0.3 m/s. The windiest September on record averaged 0.4 m/s (1982).
The wettest September on record was 2020 with 590 mm. On average, September sees 335 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 Upper Subansiri 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.
