September is one of the warmer months of the year in Tawang, with average highs near 17°C and lows around 8°C (mean 12.5°C). It is a relatively wet time of year, averaging 125 mm of rainfall and 86% relative humidity across the period.
September is one of the warmer months of the year in Tawang. Across 45 years of records, the warmest Septembers in Tawang were 2024 and 2025 — when the month averaged 13.8°C — while the coldest was 1984 at 11.2°C. Typical September days reach 17°C with nights near 8°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in Tawang, averaging 125 mm of rainfall. The wettest September on record was 2014 with 212 mm, while the driest was 1994 at 50 mm.
Relative humidity in Tawang during September averages 86%. The most humid September was 2020 at 90%, and the least humid was 2009 at 83%.
September receives about 4.1 kWh/m²/day of solar energy in Tawang. The sunniest September was 2021 at 4.8 kWh/m²/day, and the cloudiest was 1988 at 3.3.
Average wind speed in Tawang during September is 0.5 m/s. The windiest Septembers were 2006, 2009 and 2011, among others at 0.6 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.1°C | 12.2°C | 12.3°C | 12.8°C | 13.4°C | +1.3°C |
| Avg High | 16.4°C | 16.9°C | 17.2°C | 17.0°C | 18.0°C | +1.6°C |
| Avg Low | 7.8°C | 7.7°C | 7.5°C | 8.7°C | 9.0°C | +1.2°C |
| Avg Rain | 144 mm | 116 mm | 111 mm | 141 mm | 111 mm | -33 mm |
September temperatures in Tawang have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1.1°C (2000) to a record high of 22.8°C (1988).
Rainfall in September is a relatively wet time of year, averaging 125 mm, with a wettest year of 212 mm.
One of the best times to visit Tawang
September is one of the best times to visit Tawang. Expect days averaging 17°C and nights around 8°C (mean 12.5°C) — warmer than Tawang's yearly average — with higher rainfall (125 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 | 18.7°C | 13.8°C | 8.9°C | 21.2°C | 4.8°C | 104 mm | 85% | 0.5 m/s | 4.3 |
| 2024 🔥 | 18.4°C | 13.8°C | 9.3°C | 20.5°C | 5.6°C | 131 mm | 86% | 0.5 m/s | 4.4 |
| 2023 | 18.6°C | 13.7°C | 8.7°C | 21.8°C | 5.3°C | 64 mm | 84% | 0.5 m/s | 4.6 |
| 2022 | 17.0°C | 13.1°C | 9.2°C | 20.0°C | 7.0°C | 66 mm | 88% | 0.5 m/s | 3.9 |
| 2021 | 17.7°C | 12.9°C | 8.1°C | 20.0°C | 5.1°C | 142 mm | 85% | 0.5 m/s | 4.8 |
| 2020 | 17.3°C | 13.4°C | 9.5°C | 21.0°C | 7.6°C | 160 mm | 90% | 0.5 m/s | 3.6 |
| 2019 | 16.5°C | 12.6°C | 8.7°C | 20.0°C | 5.1°C | 196 mm | 88% | 0.5 m/s | 3.8 |
| 2018 | 17.0°C | 13.1°C | 9.2°C | 20.6°C | 5.3°C | 152 mm | 88% | 0.5 m/s | 4.1 |
| 2017 | 17.3°C | 13.4°C | 9.5°C | 19.3°C | 7.1°C | 125 mm | 88% | 0.5 m/s | 3.9 |
| 2016 | 16.9°C | 13.0°C | 9.2°C | 19.3°C | 7.3°C | 81 mm | 89% | 0.5 m/s | 3.7 |
| 2015 | 17.1°C | 13.2°C | 9.3°C | 19.4°C | 6.1°C | 116 mm | 88% | 0.5 m/s | 4.1 |
| 2014 🌧️ | 16.6°C | 12.5°C | 8.3°C | 19.6°C | 6.0°C | 212 mm | 86% | 0.5 m/s | 4.2 |
| 2013 | 17.1°C | 12.7°C | 8.2°C | 19.7°C | 4.1°C | 95 mm | 86% | 0.5 m/s | 4.2 |
| 2012 | 17.1°C | 12.8°C | 8.6°C | 19.3°C | 6.0°C | 123 mm | 87% | 0.5 m/s | 4 |
| 2011 | 17.5°C | 12.6°C | 7.7°C | 20.1°C | 1.7°C | 133 mm | 85% | 0.6 m/s | 4.5 |
| 2010 | 16.8°C | 12.4°C | 8.0°C | 18.4°C | 4.5°C | 175 mm | 87% | 0.5 m/s | 3.9 |
| 2009 | 18.0°C | 12.6°C | 7.3°C | 20.7°C | 3.1°C | 110 mm | 83% | 0.6 m/s | 4.6 |
| 2008 | 17.1°C | 12.2°C | 7.3°C | 19.6°C | 4.7°C | 77 mm | 85% | 0.5 m/s | 4.2 |
| 2007 | 17.0°C | 12.3°C | 7.6°C | 19.9°C | 1.7°C | 175 mm | 85% | 0.5 m/s | 4.1 |
| 2006 | 17.0°C | 12.3°C | 7.5°C | 20.0°C | 4.1°C | 88 mm | 85% | 0.6 m/s | 4 |
| 2005 | 18.0°C | 12.5°C | 7.0°C | 22.2°C | 2.8°C | 84 mm | 84% | 0.5 m/s | 4.5 |
| 2004 | 17.0°C | 12.4°C | 7.9°C | 19.3°C | 2.7°C | 96 mm | 85% | 0.5 m/s | 3.9 |
| 2003 | 17.4°C | 13.1°C | 8.8°C | 19.6°C | 6.0°C | 157 mm | 87% | 0.5 m/s | 3.9 |
| 2002 | 16.3°C | 11.5°C | 6.7°C | 18.7°C | 2.4°C | 83 mm | 86% | 0.5 m/s | 4.1 |
| 2001 | 17.6°C | 12.6°C | 7.6°C | 19.7°C | 5.4°C | 124 mm | 84% | 0.6 m/s | 4 |
| 2000 | 16.7°C | 11.9°C | 7.1°C | 19.2°C | 1.1°C | 113 mm | 84% | 0.5 m/s | 4.4 |
| 1999 | 17.3°C | 12.6°C | 8.0°C | 19.7°C | 5.9°C | 161 mm | 85% | 0.5 m/s | 4.6 |
| 1998 | 17.8°C | 12.7°C | 7.6°C | 20.2°C | 3.5°C | 99 mm | 84% | 0.6 m/s | 4.6 |
| 1997 | 15.6°C | 11.6°C | 7.5°C | 18.8°C | 3.9°C | 98 mm | 88% | 0.5 m/s | 4.5 |
| 1996 | 16.8°C | 12.3°C | 7.7°C | 19.3°C | 4.4°C | 88 mm | 86% | 0.5 m/s | 4.4 |
| 1995 | 16.6°C | 12.1°C | 7.5°C | 20.6°C | 5.1°C | 177 mm | 86% | 0.5 m/s | 4.4 |
| 1994 | 17.8°C | 12.8°C | 7.7°C | 19.4°C | 2.4°C | 50 mm | 84% | 0.5 m/s | 4.5 |
| 1993 | 16.3°C | 11.9°C | 7.5°C | 18.9°C | 5.9°C | 138 mm | 86% | 0.5 m/s | 4.4 |
| 1992 | 17.4°C | 12.1°C | 6.9°C | 20.6°C | 3.4°C | 78 mm | 83% | 0.6 m/s | 4.1 |
| 1991 | 16.3°C | 12.2°C | 8.2°C | 18.5°C | 6.9°C | 146 mm | 88% | 0.5 m/s | 3.9 |
| 1990 | 16.6°C | 12.2°C | 7.9°C | 19.6°C | 4.8°C | 122 mm | 87% | 0.5 m/s | 3.5 |
| 1989 | 16.7°C | 12.5°C | 8.3°C | 19.4°C | 5.6°C | 170 mm | 87% | 0.5 m/s | 4.2 |
| 1988 | 17.1°C | 12.8°C | 8.4°C | 22.8°C | 6.0°C | 135 mm | 87% | 0.5 m/s | 3.3 |
| 1987 | 16.4°C | 12.5°C | 8.6°C | 18.8°C | 6.5°C | 182 mm | 88% | 0.5 m/s | 3.9 |
| 1986 | 16.1°C | 11.5°C | 6.9°C | 19.5°C | 3.4°C | 116 mm | 86% | 0.5 m/s | 3.7 |
| 1985 | 16.4°C | 11.9°C | 7.4°C | 19.3°C | 4.2°C | 165 mm | 87% | 0.6 m/s | 3.8 |
| 1984 ❄️ | 15.5°C | 11.2°C | 7.0°C | 19.5°C | 2.9°C | 157 mm | 87% | 0.5 m/s | 4.1 |
| 1983 | 16.6°C | 12.5°C | 8.4°C | 19.9°C | 4.9°C | 174 mm | 88% | 0.5 m/s | — |
| 1982 | 17.1°C | 12.3°C | 7.5°C | 20.5°C | 3.5°C | 57 mm | 86% | 0.6 m/s | — |
| 1981 | 16.1°C | 11.9°C | 7.7°C | 20.0°C | 4.4°C | 138 mm | 86% | 0.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17°C with lows near 8°C (mean 12.5°C), based on 45 years of NASA POWER data.
September averages 125 mm of rainfall in Tawang, a relatively wet time of year. The wettest on record was 212 mm in 2014.
The hottest September reached 22.8°C in 1988. The coldest dipped to 1.1°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 16.3°C to 18.1°C and overnight lows from 7.6°C to 8.8°C over the same span.
September is one of the warmer months of the year in Tawang and a relatively wet time of year, so plan for around 17°C daytime highs and 8°C at night.
Not quite — September is the 9th coolest month in Tawang, averaging 12.5°C.
For September in Tawang, pack light layers you can adjust through the day, with typical highs of 17°C and lows of 8°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 0.6 m/s (1982).
The wettest September on record was 2014 with 212 mm. On average, September sees 125 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 Tawang 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.
