September is one of the warmer months of the year in Lower Subansiri, with average highs near 25.5°C and lows around 18.5°C (mean 22°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 23.8°C — while the coldest was 1984 at 20.3°C. Typical September days reach 25.5°C with nights near 18.5°C. The long-term trend is warming, about 0.4°C per decade.
September is a relatively wet time of year in Lower Subansiri, averaging 321 mm of rainfall. The wettest September on record was 1990 with 512 mm, while the driest was 1998 at 132 mm.
Relative humidity in Lower Subansiri during September averages 86%. The most humid September was 2020 at 91%, and the least humid was 2005 at 80%.
September receives about 3.6 kWh/m²/day of solar energy in Lower Subansiri. The sunniest Septembers were 2005, 2009 and 2021 at 4.6 kWh/m²/day, and the cloudiest was 1988 at 2.4.
Average wind speed in Lower Subansiri during September is 0.5 m/s. The windiest September was 2012 at 0.7 m/s, while the calmest were 2001, 2003 and 2019, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.4°C | 21.7°C | 22.0°C | 22.3°C | 23.1°C | +1.7°C |
| Avg High | 24.7°C | 25.3°C | 25.8°C | 25.4°C | 26.7°C | +2°C |
| Avg Low | 18.1°C | 18.1°C | 18.2°C | 19.2°C | 19.5°C | +1.4°C |
| Avg Rain | 337 mm | 311 mm | 275 mm | 381 mm | 290 mm | -48 mm |
September temperatures in Lower Subansiri have risen by about 1.9°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.
A good time to visit Lower Subansiri
September is a good time to visit Lower Subansiri, with days averaging 25.5°C and nights around 18.5°C (mean 22°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 | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.8°C | 23.4°C | 20.0°C | 29.9°C | 18.8°C | 379 mm | 86% | 0.5 m/s | 4 |
| 2024 🔥 | 27.6°C | 23.8°C | 20.0°C | 31.2°C | 18.0°C | 206 mm | 83% | 0.5 m/s | 4.5 |
| 2023 | 27.6°C | 23.3°C | 19.0°C | 30.4°C | 17.3°C | 183 mm | 82% | 0.5 m/s | 4.5 |
| 2022 | 25.7°C | 22.4°C | 19.1°C | 28.6°C | 17.7°C | 276 mm | 88% | 0.5 m/s | 3.4 |
| 2021 | 26.6°C | 22.9°C | 19.1°C | 28.7°C | 17.8°C | 230 mm | 84% | 0.5 m/s | 4.6 |
| 2020 | 25.8°C | 22.8°C | 19.9°C | 28.5°C | 18.5°C | 464 mm | 91% | 0.5 m/s | 3.1 |
| 2019 | 25.1°C | 22.1°C | 19.1°C | 28.6°C | 16.1°C | 434 mm | 89% | 0.4 m/s | 3.2 |
| 2018 | 25.3°C | 22.5°C | 19.7°C | 30.4°C | 18.0°C | 381 mm | 90% | 0.5 m/s | 3.4 |
| 2017 | 25.7°C | 22.7°C | 19.7°C | 29.2°C | 18.8°C | 364 mm | 89% | 0.5 m/s | 3.3 |
| 2016 | 25.3°C | 22.4°C | 19.5°C | 27.0°C | 17.3°C | 433 mm | 89% | 0.5 m/s | 3.1 |
| 2015 | 25.4°C | 22.3°C | 19.3°C | 27.9°C | 17.4°C | 274 mm | 90% | 0.5 m/s | 3.6 |
| 2014 | 25.2°C | 22.1°C | 19.1°C | 29.4°C | 16.2°C | 425 mm | 88% | 0.5 m/s | 3.7 |
| 2013 | 25.7°C | 22.4°C | 19.1°C | 28.7°C | 16.7°C | 215 mm | 87% | 0.6 m/s | 4 |
| 2012 | 25.0°C | 22.2°C | 19.5°C | 28.9°C | 17.0°C | 451 mm | 90% | 0.7 m/s | 3.5 |
| 2011 | 26.1°C | 22.4°C | 18.7°C | 29.4°C | 15.7°C | 340 mm | 85% | 0.5 m/s | 4.1 |
| 2010 | 25.2°C | 21.8°C | 18.4°C | 28.0°C | 15.0°C | 493 mm | 88% | 0.5 m/s | 3.4 |
| 2009 | 26.5°C | 22.4°C | 18.3°C | 28.3°C | 16.0°C | 176 mm | 83% | 0.5 m/s | 4.6 |
| 2008 | 25.8°C | 21.9°C | 18.0°C | 27.7°C | 17.0°C | 225 mm | 85% | 0.5 m/s | 4.1 |
| 2007 | 25.7°C | 21.7°C | 17.7°C | 28.4°C | 14.6°C | 398 mm | 83% | 0.5 m/s | 4.1 |
| 2006 | 25.6°C | 21.9°C | 18.1°C | 29.9°C | 16.3°C | 247 mm | 84% | 0.5 m/s | 3.9 |
| 2005 | 27.1°C | 22.7°C | 18.4°C | 29.6°C | 16.8°C | 169 mm | 80% | 0.5 m/s | 4.6 |
| 2004 | 25.0°C | 21.6°C | 18.1°C | 27.2°C | 15.7°C | 210 mm | 86% | 0.5 m/s | 3.6 |
| 2003 | 25.6°C | 22.2°C | 18.9°C | 27.7°C | 17.9°C | 362 mm | 87% | 0.4 m/s | 3.4 |
| 2002 | 25.9°C | 21.8°C | 17.6°C | 28.8°C | 14.6°C | 258 mm | 82% | 0.5 m/s | 4.1 |
| 2001 | 26.0°C | 22.2°C | 18.4°C | 27.7°C | 16.9°C | 274 mm | 85% | 0.4 m/s | 3.6 |
| 2000 | 25.2°C | 21.6°C | 18.0°C | 29.8°C | 14.4°C | 437 mm | 87% | 0.5 m/s | 3.6 |
| 1999 | 26.0°C | 22.3°C | 18.6°C | 28.5°C | 17.0°C | 332 mm | 85% | 0.4 m/s | 4.3 |
| 1998 | 26.8°C | 22.7°C | 18.6°C | 29.0°C | 16.7°C | 132 mm | 82% | 0.5 m/s | 4.5 |
| 1997 | 23.9°C | 20.7°C | 17.5°C | 28.5°C | 13.6°C | 242 mm | 88% | 0.5 m/s | 4 |
| 1996 | 25.4°C | 21.8°C | 18.2°C | 29.0°C | 17.1°C | 187 mm | 85% | 0.5 m/s | 3.4 |
| 1995 | 24.5°C | 21.2°C | 18.0°C | 30.1°C | 15.4°C | 375 mm | 87% | 0.5 m/s | 3.8 |
| 1994 | 26.4°C | 22.3°C | 18.2°C | 29.0°C | 14.2°C | 288 mm | 84% | 0.5 m/s | 3.9 |
| 1993 | 24.9°C | 21.3°C | 17.8°C | 28.5°C | 16.6°C | 365 mm | 86% | 0.5 m/s | 3.2 |
| 1992 | 25.9°C | 21.7°C | 17.5°C | 29.9°C | 14.6°C | 161 mm | 83% | 0.5 m/s | 3.1 |
| 1991 | 24.5°C | 21.4°C | 18.4°C | 27.0°C | 17.1°C | 511 mm | 89% | 0.4 m/s | 2.8 |
| 1990 🌧️ | 24.7°C | 21.5°C | 18.3°C | 29.2°C | 14.8°C | 512 mm | 88% | 0.5 m/s | 2.6 |
| 1989 | 25.3°C | 21.9°C | 18.5°C | 28.7°C | 17.0°C | 341 mm | 89% | 0.5 m/s | 3.3 |
| 1988 | 25.2°C | 21.9°C | 18.5°C | 27.8°C | 16.9°C | 347 mm | 88% | 0.5 m/s | 2.4 |
| 1987 | 24.6°C | 21.6°C | 18.6°C | 26.5°C | 15.0°C | 490 mm | 90% | 0.4 m/s | 2.9 |
| 1986 | 24.0°C | 20.7°C | 17.4°C | 26.9°C | 14.2°C | 278 mm | 87% | 0.5 m/s | 2.7 |
| 1985 | 24.6°C | 21.4°C | 18.1°C | 28.8°C | 16.6°C | 339 mm | 89% | 0.4 m/s | 3.1 |
| 1984 ❄️ | 23.6°C | 20.3°C | 16.9°C | 28.0°C | 13.5°C | 300 mm | 88% | 0.5 m/s | 2.6 |
| 1983 | 25.1°C | 21.9°C | 18.6°C | 27.9°C | 16.4°C | 437 mm | 88% | 0.5 m/s | — |
| 1982 | 25.3°C | 21.6°C | 17.9°C | 29.4°C | 15.1°C | 238 mm | 86% | 0.6 m/s | — |
| 1981 | 24.9°C | 21.5°C | 18.1°C | 28.0°C | 15.8°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 25.5°C with lows near 18.5°C (mean 22°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 1.9°C. Daytime highs moved from 24.7°C to 26.9°C and overnight lows from 17.9°C to 19.4°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 25.5°C daytime highs and 18.5°C at night.
Not quite — September is the 9th coolest month in Lower Subansiri, averaging 22°C.
For September in Lower Subansiri, pack light layers you can adjust through the day, with typical highs of 25.5°C and lows of 18.5°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.
