September is one of the warmer months of the year in Dibang Valley, with average highs near 16.3°C and lows around 8°C (mean 12.2°C). It is a relatively wet time of year, averaging 166 mm of rainfall and 87% relative humidity across the period.
September is one of the warmer months of the year in Dibang Valley. Across 45 years of records, the warmest September in Dibang Valley was 2024 — when the month averaged 14.2°C — while the coldest was 1984 at 10.5°C. Typical September days reach 16.3°C with nights near 8°C. The long-term trend is warming, about 0.4°C per decade.
September is a relatively wet time of year in Dibang Valley, averaging 166 mm of rainfall. The wettest September on record was 2016 with 378 mm, while the driest was 2005 at 68 mm.
Relative humidity in Dibang Valley during September averages 87%. The most humid September was 2020 at 90%, and the least humid was 2009 at 84%.
September receives about 3.7 kWh/m²/day of solar energy in Dibang Valley. The sunniest September was 2009 at 4.8 kWh/m²/day, and the cloudiest was 1988 at 2.5.
Average wind speed in Dibang Valley during September is 1.5 m/s. The windiest Septembers were 1982 and 2012 at 1.7 m/s, while the calmest were 1998 and 2003 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.6°C | 11.9°C | 12.2°C | 12.3°C | 13.2°C | +1.6°C |
| Avg High | 15.7°C | 16.2°C | 16.7°C | 16.2°C | 17.3°C | +1.6°C |
| Avg Low | 7.4°C | 7.5°C | 7.7°C | 8.5°C | 9.1°C | +1.7°C |
| Avg Rain | 163 mm | 152 mm | 118 mm | 211 mm | 201 mm | +38 mm |
September temperatures in Dibang Valley have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1.1°C (1997) to a record high of 21.9°C (2023).
Rainfall in September is a relatively wet time of year, averaging 166 mm, with a wettest year of 378 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Dibang Valley
September is one of the best times to visit Dibang Valley. Expect days averaging 16.3°C and nights around 8°C (mean 12.2°C) — warmer than Dibang Valley's yearly average — with higher rainfall (166 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.7°C | 13.8°C | 9.9°C | 21.5°C | 7.1°C | 139 mm | 88% | 1.4 m/s | 4.3 |
| 2024 🔥 | 18.5°C | 14.2°C | 9.9°C | 20.1°C | 8.2°C | 143 mm | 86% | 1.4 m/s | 4.6 |
| 2023 | 18.0°C | 13.2°C | 8.5°C | 21.9°C | 5.9°C | 72 mm | 85% | 1.5 m/s | 4.5 |
| 2022 | 15.9°C | 12.3°C | 8.7°C | 18.6°C | 6.8°C | 335 mm | 89% | 1.4 m/s | 3.4 |
| 2021 | 16.8°C | 12.4°C | 8.0°C | 19.2°C | 4.9°C | 163 mm | 87% | 1.4 m/s | 4.6 |
| 2020 | 16.8°C | 13.3°C | 9.8°C | 19.7°C | 8.2°C | 354 mm | 90% | 1.6 m/s | 3 |
| 2019 | 15.9°C | 12.2°C | 8.4°C | 19.2°C | 1.8°C | 228 mm | 89% | 1.5 m/s | 3.4 |
| 2018 | 16.2°C | 12.7°C | 9.2°C | 20.2°C | 6.6°C | 248 mm | 89% | 1.4 m/s | 3.4 |
| 2017 | 16.9°C | 13.2°C | 9.6°C | 19.5°C | 7.4°C | 173 mm | 89% | 1.4 m/s | 3.5 |
| 2016 🌧️ | 15.6°C | 12.3°C | 8.9°C | 18.1°C | 6.3°C | 378 mm | 90% | 1.5 m/s | 3.2 |
| 2015 | 16.0°C | 12.2°C | 8.5°C | 18.6°C | 3.9°C | 249 mm | 90% | 1.4 m/s | 3.5 |
| 2014 | 16.1°C | 12.0°C | 7.8°C | 20.3°C | 3.0°C | 123 mm | 88% | 1.5 m/s | 4 |
| 2013 | 16.2°C | 12.3°C | 8.5°C | 19.0°C | 5.4°C | 173 mm | 88% | 1.6 m/s | 4.1 |
| 2012 | 15.6°C | 12.0°C | 8.4°C | 19.5°C | 5.8°C | 211 mm | 89% | 1.7 m/s | 3.5 |
| 2011 | 17.1°C | 12.6°C | 8.1°C | 20.3°C | 5.2°C | 138 mm | 87% | 1.5 m/s | 4.1 |
| 2010 | 16.0°C | 11.9°C | 7.8°C | 18.2°C | 3.4°C | 189 mm | 88% | 1.4 m/s | 3.5 |
| 2009 | 17.5°C | 12.5°C | 7.6°C | 20.1°C | 4.7°C | 73 mm | 84% | 1.4 m/s | 4.8 |
| 2008 | 16.4°C | 11.8°C | 7.3°C | 17.9°C | 3.9°C | 83 mm | 87% | 1.4 m/s | 4.2 |
| 2007 | 16.5°C | 11.9°C | 7.3°C | 20.2°C | 3.4°C | 169 mm | 85% | 1.4 m/s | 4.1 |
| 2006 | 16.8°C | 12.4°C | 7.9°C | 20.5°C | 5.7°C | 128 mm | 86% | 1.4 m/s | 3.7 |
| 2005 | 17.5°C | 12.6°C | 7.7°C | 21.3°C | 4.2°C | 68 mm | 84% | 1.4 m/s | 4.5 |
| 2004 | 16.9°C | 12.5°C | 8.2°C | 19.9°C | 5.0°C | 113 mm | 86% | 1.4 m/s | 3.9 |
| 2003 | 16.2°C | 12.4°C | 8.6°C | 18.4°C | 5.7°C | 194 mm | 88% | 1.3 m/s | 3.3 |
| 2002 | 16.1°C | 11.5°C | 6.9°C | 17.9°C | 2.8°C | 101 mm | 86% | 1.4 m/s | 3.8 |
| 2001 | 16.9°C | 12.7°C | 8.5°C | 18.8°C | 6.0°C | 125 mm | 87% | 1.4 m/s | 3.6 |
| 2000 | 15.9°C | 11.5°C | 7.0°C | 19.1°C | 2.6°C | 128 mm | 87% | 1.5 m/s | 3.5 |
| 1999 | 17.3°C | 12.7°C | 8.0°C | 19.6°C | 4.9°C | 104 mm | 85% | 1.4 m/s | 4.3 |
| 1998 | 17.2°C | 12.5°C | 7.8°C | 19.3°C | 3.9°C | 106 mm | 86% | 1.3 m/s | 4.5 |
| 1997 | 15.3°C | 10.8°C | 6.3°C | 19.0°C | 1.1°C | 184 mm | 87% | 1.5 m/s | 3.6 |
| 1996 | 16.0°C | 11.9°C | 7.8°C | 18.3°C | 6.1°C | 96 mm | 87% | 1.4 m/s | 3.6 |
| 1995 | 15.8°C | 11.6°C | 7.4°C | 21.3°C | 3.0°C | 179 mm | 87% | 1.4 m/s | 4 |
| 1994 | 17.6°C | 12.6°C | 7.7°C | 19.5°C | 3.2°C | 113 mm | 85% | 1.5 m/s | 4 |
| 1993 | 15.2°C | 11.3°C | 7.4°C | 17.4°C | 4.5°C | 236 mm | 89% | 1.4 m/s | 3.3 |
| 1992 | 16.7°C | 11.9°C | 7.1°C | 20.4°C | 4.0°C | 98 mm | 85% | 1.5 m/s | 3.6 |
| 1991 | 15.9°C | 12.0°C | 8.1°C | 18.1°C | 5.8°C | 146 mm | 88% | 1.4 m/s | 3.1 |
| 1990 | 15.3°C | 11.3°C | 7.3°C | 19.0°C | 2.0°C | 261 mm | 88% | 1.5 m/s | 2.9 |
| 1989 | 16.1°C | 12.2°C | 8.2°C | 19.1°C | 3.3°C | 165 mm | 88% | 1.5 m/s | 3.6 |
| 1988 | 15.6°C | 11.6°C | 7.7°C | 19.1°C | 2.9°C | 152 mm | 88% | 1.5 m/s | 2.5 |
| 1987 | 15.3°C | 11.7°C | 8.1°C | 17.8°C | 4.0°C | 239 mm | 90% | 1.4 m/s | 2.6 |
| 1986 | 14.9°C | 11.0°C | 7.1°C | 18.2°C | 2.8°C | 209 mm | 88% | 1.5 m/s | 3 |
| 1985 | 15.7°C | 11.5°C | 7.4°C | 18.9°C | 1.9°C | 179 mm | 88% | 1.6 m/s | 3.4 |
| 1984 ❄️ | 14.9°C | 10.5°C | 6.0°C | 18.8°C | 1.5°C | 143 mm | 87% | 1.6 m/s | 3.2 |
| 1983 | 16.3°C | 11.9°C | 7.5°C | 19.1°C | 1.9°C | 116 mm | 87% | 1.6 m/s | — |
| 1982 | 16.4°C | 11.9°C | 7.4°C | 20.6°C | 1.8°C | 151 mm | 86% | 1.7 m/s | — |
| 1981 | 16.1°C | 11.7°C | 7.4°C | 19.4°C | 2.8°C | 111 mm | 87% | 1.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.3°C with lows near 8°C (mean 12.2°C), based on 45 years of NASA POWER data.
September averages 166 mm of rainfall in Dibang Valley, a relatively wet time of year. The wettest on record was 378 mm in 2016.
The hottest September reached 21.9°C in 2023. The coldest dipped to 1.1°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 15.9°C to 17.4°C and overnight lows from 7.1°C to 9°C over the same span.
September is one of the warmer months of the year in Dibang Valley and a relatively wet time of year, so plan for around 16.3°C daytime highs and 8°C at night.
Not quite — September is the 9th coolest month in Dibang Valley, averaging 12.2°C.
For September in Dibang Valley, pack light layers you can adjust through the day, with typical highs of 16.3°C and lows of 8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 87% — quite humid.
Average wind speed in September is 1.5 m/s. The windiest September on record averaged 1.7 m/s (1982).
The wettest September on record was 2016 with 378 mm. On average, September sees 166 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 Dibang Valley 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.
