September is one of the warmer months of the year in Lower Subansiri, with average highs near 28.7°C and lows around 16.3°C (mean 22.5°C). It is a relatively wet time of year, averaging 321 mm of rainfall and 86% relative humidity across the period.
September is one of the warmer months of the year in Lower Subansiri. Across 45 years of records, the warmest September in Lower Subansiri was 2024 — when the month averaged 24.6°C — while the coldest was 1986 at 20.6°C. Typical September days reach 28.7°C with nights near 16.3°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 | 21.8°C | 22.3°C | 22.3°C | 22.8°C | 23.8°C | +2°C |
| Avg High | 28.0°C | 28.9°C | 28.5°C | 28.8°C | 29.6°C | +1.6°C |
| Avg Low | 15.6°C | 15.7°C | 16.0°C | 16.8°C | 18.0°C | +2.4°C |
| Avg Rain | 337 mm | 311 mm | 275 mm | 381 mm | 290 mm | -48 mm |
September temperatures in Lower Subansiri have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 13.5°C (1984) to a record high of 31.2°C (2024).
Rainfall in September is a relatively wet time of year, averaging 321 mm, with a wettest year of 512 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 Lower Subansiri
September is a good time to visit Lower Subansiri, with days averaging 28.7°C and nights around 16.3°C (mean 22.5°C, warmer than Lower Subansiri's yearly average) and higher rainfall. October and May are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 29.9°C | 18.8°C | 24.3°C | 379 mm | 86% | 0.5 m/s | 4 |
| 2024 🔥 | 31.2°C | 18.0°C | 24.6°C | 206 mm | 83% | 0.5 m/s | 4.5 |
| 2023 | 30.4°C | 17.3°C | 23.9°C | 183 mm | 82% | 0.5 m/s | 4.5 |
| 2022 | 28.6°C | 17.7°C | 23.2°C | 276 mm | 88% | 0.5 m/s | 3.4 |
| 2021 | 28.7°C | 17.8°C | 23.3°C | 230 mm | 84% | 0.5 m/s | 4.6 |
| 2020 | 28.5°C | 18.5°C | 23.5°C | 464 mm | 91% | 0.5 m/s | 3.1 |
| 2019 | 28.6°C | 16.1°C | 22.3°C | 434 mm | 89% | 0.4 m/s | 3.2 |
| 2018 | 30.4°C | 18.0°C | 24.2°C | 381 mm | 90% | 0.5 m/s | 3.4 |
| 2017 | 29.2°C | 18.8°C | 24.0°C | 364 mm | 89% | 0.5 m/s | 3.3 |
| 2016 | 27.0°C | 17.3°C | 22.2°C | 433 mm | 89% | 0.5 m/s | 3.1 |
| 2015 | 27.9°C | 17.4°C | 22.6°C | 274 mm | 90% | 0.5 m/s | 3.6 |
| 2014 | 29.4°C | 16.2°C | 22.8°C | 425 mm | 88% | 0.5 m/s | 3.7 |
| 2013 | 28.7°C | 16.7°C | 22.7°C | 215 mm | 87% | 0.6 m/s | 4 |
| 2012 | 28.9°C | 17.0°C | 23.0°C | 451 mm | 90% | 0.7 m/s | 3.5 |
| 2011 | 29.4°C | 15.7°C | 22.6°C | 340 mm | 85% | 0.5 m/s | 4.1 |
| 2010 | 28.0°C | 15.0°C | 21.5°C | 493 mm | 88% | 0.5 m/s | 3.4 |
| 2009 | 28.3°C | 16.0°C | 22.1°C | 176 mm | 83% | 0.5 m/s | 4.6 |
| 2008 | 27.7°C | 17.0°C | 22.3°C | 225 mm | 85% | 0.5 m/s | 4.1 |
| 2007 | 28.4°C | 14.6°C | 21.5°C | 398 mm | 83% | 0.5 m/s | 4.1 |
| 2006 | 29.9°C | 16.3°C | 23.1°C | 247 mm | 84% | 0.5 m/s | 3.9 |
| 2005 | 29.6°C | 16.8°C | 23.2°C | 169 mm | 80% | 0.5 m/s | 4.6 |
| 2004 | 27.2°C | 15.7°C | 21.4°C | 210 mm | 86% | 0.5 m/s | 3.6 |
| 2003 | 27.7°C | 17.9°C | 22.8°C | 362 mm | 87% | 0.4 m/s | 3.4 |
| 2002 | 28.8°C | 14.6°C | 21.7°C | 258 mm | 82% | 0.5 m/s | 4.1 |
| 2001 | 27.7°C | 16.9°C | 22.3°C | 274 mm | 85% | 0.4 m/s | 3.6 |
| 2000 | 29.8°C | 14.4°C | 22.1°C | 437 mm | 87% | 0.5 m/s | 3.6 |
| 1999 | 28.5°C | 17.0°C | 22.8°C | 332 mm | 85% | 0.4 m/s | 4.3 |
| 1998 | 29.0°C | 16.7°C | 22.8°C | 132 mm | 82% | 0.5 m/s | 4.5 |
| 1997 | 28.5°C | 13.6°C | 21.0°C | 242 mm | 88% | 0.5 m/s | 4 |
| 1996 | 29.0°C | 17.1°C | 23.0°C | 187 mm | 85% | 0.5 m/s | 3.4 |
| 1995 | 30.1°C | 15.4°C | 22.7°C | 375 mm | 87% | 0.5 m/s | 3.8 |
| 1994 | 29.0°C | 14.2°C | 21.6°C | 288 mm | 84% | 0.5 m/s | 3.9 |
| 1993 | 28.5°C | 16.6°C | 22.5°C | 365 mm | 86% | 0.5 m/s | 3.2 |
| 1992 | 29.9°C | 14.6°C | 22.3°C | 161 mm | 83% | 0.5 m/s | 3.1 |
| 1991 | 27.0°C | 17.1°C | 22.0°C | 511 mm | 89% | 0.4 m/s | 2.8 |
| 1990 🌧️ | 29.2°C | 14.8°C | 22.0°C | 512 mm | 88% | 0.5 m/s | 2.6 |
| 1989 | 28.7°C | 17.0°C | 22.8°C | 341 mm | 89% | 0.5 m/s | 3.3 |
| 1988 | 27.8°C | 16.9°C | 22.3°C | 347 mm | 88% | 0.5 m/s | 2.4 |
| 1987 | 26.5°C | 15.0°C | 20.7°C | 490 mm | 90% | 0.4 m/s | 2.9 |
| 1986 ❄️ | 26.9°C | 14.2°C | 20.6°C | 278 mm | 87% | 0.5 m/s | 2.7 |
| 1985 | 28.8°C | 16.6°C | 22.7°C | 339 mm | 89% | 0.4 m/s | 3.1 |
| 1984 | 28.0°C | 13.5°C | 20.7°C | 300 mm | 88% | 0.5 m/s | 2.6 |
| 1983 | 27.9°C | 16.4°C | 22.2°C | 437 mm | 88% | 0.5 m/s | — |
| 1982 | 29.4°C | 15.1°C | 22.2°C | 238 mm | 86% | 0.6 m/s | — |
| 1981 | 28.0°C | 15.8°C | 21.9°C | 267 mm | 88% | 0.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 28.7°C with lows near 16.3°C (mean 22.5°C), based on 45 years of NASA POWER data.
September averages 321 mm of rainfall in Lower Subansiri, a relatively wet time of year. The wettest on record was 512 mm in 1990.
The hottest September reached 31.2°C in 2024. The coldest dipped to 13.5°C in 1984.
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 28.4°C to 29.8°C and overnight lows from 15.5°C to 17.9°C over the same span.
September is one of the warmer months of the year in Lower Subansiri and a relatively wet time of year, so plan for around 28.7°C daytime highs and 16.3°C at night.
Not quite — September is the 9th coolest month in Lower Subansiri, averaging 22.5°C.
For September in Lower Subansiri, pack light layers you can adjust through the day, with typical highs of 28.7°C and lows of 16.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 86% — quite humid.
Average wind speed in September is 0.5 m/s. The windiest September on record averaged 0.7 m/s (2012).
The wettest September on record was 1990 with 512 mm. On average, September sees 321 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 Lower 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.
