September is one of the warmer months of the year in Bongaigaon, with average highs near 33.5°C and lows around 22.8°C (mean 28.2°C). It is a relatively wet time of year, averaging 242 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Bongaigaon. Across 45 years of records, the warmest September in Bongaigaon was 2024 — when the month averaged 30.1°C — while the coldest was 1986 at 26.5°C. Typical September days reach 33.5°C with nights near 22.8°C. The long-term trend is warming, about 0.3°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.7°C | 27.9°C | 27.8°C | 28.4°C | 29.2°C | +1.5°C |
| Avg High | 33.1°C | 33.6°C | 33.0°C | 33.6°C | 34.3°C | +1.2°C |
| Avg Low | 22.3°C | 22.1°C | 22.6°C | 23.1°C | 24.2°C | +1.9°C |
| Avg Rain | 270 mm | 216 mm | 207 mm | 298 mm | 210 mm | -60 mm |
September temperatures in Bongaigaon have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 20.3°C (1986) to a record high of 36.2°C (2012).
Rainfall in September is a relatively wet time of year, averaging 242 mm, with a wettest year of 436 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
A good time to visit Bongaigaon
September is a good time to visit Bongaigaon, with days averaging 33.5°C and nights around 22.8°C (mean 28.2°C, warmer than Bongaigaon's yearly average) and higher rainfall. November and March are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 33.8°C | 24.4°C | 29.1°C | 187 mm | 84% | 1.5 m/s | 4.4 |
| 2024 🔥 | 36.1°C | 24.0°C | 30.1°C | 203 mm | 81% | 1.4 m/s | 4.4 |
| 2023 | 35.1°C | 24.2°C | 29.7°C | 209 mm | 82% | 1.3 m/s | 4.5 |
| 2022 | 33.6°C | 23.9°C | 28.7°C | 111 mm | 87% | 1.7 m/s | 4 |
| 2021 | 33.3°C | 24.3°C | 28.8°C | 158 mm | 84% | 1.3 m/s | 4.9 |
| 2020 | 33.6°C | 24.4°C | 29.0°C | 392 mm | 90% | 1.6 m/s | 3.1 |
| 2019 | 34.1°C | 21.9°C | 28.0°C | 417 mm | 86% | 1.3 m/s | 3.7 |
| 2018 | 33.2°C | 23.9°C | 28.6°C | 294 mm | 87% | 1.8 m/s | 3.8 |
| 2017 | 32.9°C | 24.2°C | 28.6°C | 299 mm | 88% | 1.6 m/s | 3.6 |
| 2016 | 33.6°C | 23.4°C | 28.5°C | 197 mm | 87% | 1.4 m/s | 3.8 |
| 2015 | 33.3°C | 23.3°C | 28.3°C | 320 mm | 87% | 1.5 m/s | 4.1 |
| 2014 🌧️ | 33.3°C | 23.1°C | 28.2°C | 436 mm | 86% | 1.5 m/s | 4.1 |
| 2013 | 34.3°C | 22.2°C | 28.2°C | 164 mm | 85% | 1.6 m/s | 4.6 |
| 2012 | 36.2°C | 23.8°C | 30.0°C | 248 mm | 87% | 1.7 m/s | 3.9 |
| 2011 | 33.2°C | 23.1°C | 28.1°C | 304 mm | 84% | 1.3 m/s | 4.5 |
| 2010 | 32.1°C | 21.9°C | 27.0°C | 306 mm | 86% | 1.5 m/s | 4 |
| 2009 | 33.1°C | 22.8°C | 27.9°C | 191 mm | 85% | 1.7 m/s | 4.6 |
| 2008 | 32.0°C | 23.3°C | 27.7°C | 133 mm | 84% | 1.5 m/s | 4.4 |
| 2007 | 32.4°C | 21.9°C | 27.2°C | 316 mm | 82% | 1.5 m/s | 3.8 |
| 2006 | 33.5°C | 22.3°C | 27.9°C | 171 mm | 84% | 1.7 m/s | 3.9 |
| 2005 | 34.6°C | 23.9°C | 29.2°C | 150 mm | 81% | 1.4 m/s | 4.6 |
| 2004 | 32.3°C | 22.6°C | 27.5°C | 198 mm | 87% | 1.9 m/s | 3.8 |
| 2003 | 33.4°C | 23.3°C | 28.3°C | 212 mm | 85% | 1.3 m/s | 4.3 |
| 2002 | 33.9°C | 21.7°C | 27.8°C | 236 mm | 83% | 1.6 m/s | 4.2 |
| 2001 | 32.0°C | 23.0°C | 27.5°C | 264 mm | 84% | 1.1 m/s | 4 |
| 2000 | 32.6°C | 21.3°C | 26.9°C | 201 mm | 85% | 1.3 m/s | 4.4 |
| 1999 | 32.9°C | 23.1°C | 28.0°C | 235 mm | 84% | 1.2 m/s | 4.5 |
| 1998 | 33.7°C | 23.4°C | 28.5°C | 247 mm | 82% | 1.2 m/s | 4.3 |
| 1997 | 33.4°C | 20.5°C | 26.9°C | 257 mm | 86% | 1.5 m/s | 4 |
| 1996 | 34.2°C | 22.5°C | 28.3°C | 141 mm | 82% | 1.5 m/s | 4.6 |
| 1995 | 33.9°C | 21.2°C | 27.6°C | 328 mm | 85% | 1.4 m/s | 4.2 |
| 1994 | 33.7°C | 21.5°C | 27.6°C | 62 mm | 78% | 1.2 m/s | 5.1 |
| 1993 | 33.8°C | 23.0°C | 28.4°C | 255 mm | 83% | 1.3 m/s | 4 |
| 1992 | 33.8°C | 21.1°C | 27.5°C | 188 mm | 80% | 1.4 m/s | 4.2 |
| 1991 | 32.3°C | 23.4°C | 27.9°C | 221 mm | 86% | 1.3 m/s | 3.4 |
| 1990 | 34.6°C | 21.3°C | 28.0°C | 226 mm | 85% | 1.5 m/s | 3.7 |
| 1989 | 33.8°C | 22.2°C | 28.0°C | 318 mm | 84% | 1.6 m/s | 4.1 |
| 1988 | 32.7°C | 22.6°C | 27.7°C | 158 mm | 86% | 1.7 m/s | 3.6 |
| 1987 | 32.8°C | 23.0°C | 27.9°C | 323 mm | 85% | 1.3 m/s | 3.9 |
| 1986 ❄️ | 32.7°C | 20.3°C | 26.5°C | 223 mm | 83% | 1.6 m/s | 3.6 |
| 1985 | 32.4°C | 23.3°C | 27.9°C | 297 mm | 84% | 1.5 m/s | 4.6 |
| 1984 | 33.0°C | 20.7°C | 26.9°C | 356 mm | 86% | 1.7 m/s | 4.1 |
| 1983 | 33.5°C | 23.5°C | 28.5°C | 328 mm | 85% | 1.7 m/s | — |
| 1982 | 33.9°C | 22.4°C | 28.2°C | 155 mm | 85% | 1.7 m/s | — |
| 1981 | 32.9°C | 23.0°C | 27.9°C | 273 mm | 85% | 1.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.5°C with lows near 22.8°C (mean 28.2°C), based on 45 years of NASA POWER data.
September averages 242 mm of rainfall in Bongaigaon, a relatively wet time of year. The wettest on record was 436 mm in 2014.
The hottest September reached 36.2°C in 2012. The coldest dipped to 20.3°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.4°C. Daytime highs moved from 33.1°C to 34.4°C and overnight lows from 22.6°C to 24.2°C over the same span.
September is one of the warmer months of the year in Bongaigaon and a relatively wet time of year, so plan for around 33.5°C daytime highs and 22.8°C at night.
Not quite — September is the 8th coolest month in Bongaigaon, averaging 28.2°C.
For September in Bongaigaon, pack light, breathable clothing and sun protection, with typical highs of 33.5°C and lows of 22.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 1.5 m/s. The windiest September on record averaged 1.9 m/s (2004).
The wettest September on record was 2014 with 436 mm. On average, September sees 242 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 Bongaigaon 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.
