September is one of the warmer months of the year in Sivasagar, with average highs near 34.4°C and lows around 22.4°C (mean 28.4°C). It is a relatively wet time of year, averaging 278 mm of rainfall and 82% relative humidity across the period.
September is one of the warmer months of the year in Sivasagar. Across 45 years of records, the warmest September in Sivasagar was 2025 — when the month averaged 30.6°C — while the coldest was 1997 at 26.4°C. Typical September days reach 34.4°C with nights near 22.4°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 | 27.7°C | 28.1°C | 28.2°C | 28.7°C | 29.8°C | +2.1°C |
| Avg High | 33.7°C | 34.5°C | 34.0°C | 34.4°C | 35.7°C | +2°C |
| Avg Low | 21.8°C | 21.6°C | 22.3°C | 23.0°C | 23.8°C | +2°C |
| Avg Rain | 301 mm | 276 mm | 225 mm | 335 mm | 241 mm | -60 mm |
September temperatures in Sivasagar have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 18.7°C (1997) to a record high of 37.3°C (2024).
Rainfall in September is a relatively wet time of year, averaging 278 mm, with a wettest year of 487 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 quieter season to visit Sivasagar
If your dates are flexible, the more temperate months of November and March tend to be the most comfortable for visiting Sivasagar. That said, September — with days averaging 34.4°C and nights around 22.4°C (mean 28.4°C) and higher rainfall (278 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 🔥 | 36.7°C | 24.4°C | 30.6°C | 285 mm | 83% | 0.9 m/s | 4.7 |
| 2024 | 37.3°C | 23.5°C | 30.4°C | 245 mm | 78% | 0.9 m/s | 4.8 |
| 2023 | 36.4°C | 24.2°C | 30.3°C | 160 mm | 76% | 0.8 m/s | 5.1 |
| 2022 | 33.7°C | 23.5°C | 28.6°C | 244 mm | 84% | 1 m/s | 4.5 |
| 2021 | 35.0°C | 24.1°C | 29.6°C | 159 mm | 81% | 0.9 m/s | 5.1 |
| 2020 | 35.1°C | 23.3°C | 29.2°C | 354 mm | 87% | 1.3 m/s | 4.2 |
| 2019 | 35.1°C | 22.8°C | 28.9°C | 386 mm | 84% | 1 m/s | 4.2 |
| 2018 | 34.5°C | 23.6°C | 29.0°C | 310 mm | 84% | 1 m/s | 4.3 |
| 2017 | 34.2°C | 24.2°C | 29.2°C | 309 mm | 86% | 1.1 m/s | 4.2 |
| 2016 | 34.5°C | 21.8°C | 28.1°C | 343 mm | 85% | 1 m/s | 4.3 |
| 2015 | 34.5°C | 23.9°C | 29.2°C | 229 mm | 85% | 1.1 m/s | 4.5 |
| 2014 | 35.2°C | 22.9°C | 29.0°C | 386 mm | 83% | 0.9 m/s | 4.3 |
| 2013 | 34.2°C | 23.4°C | 28.8°C | 194 mm | 83% | 1.1 m/s | 4.5 |
| 2012 | 35.0°C | 22.5°C | 28.7°C | 430 mm | 87% | 1.6 m/s | 3.8 |
| 2011 | 33.8°C | 22.4°C | 28.1°C | 314 mm | 82% | 1 m/s | 4.7 |
| 2010 | 33.2°C | 22.2°C | 27.7°C | 452 mm | 84% | 0.9 m/s | 4.1 |
| 2009 | 34.0°C | 22.6°C | 28.3°C | 158 mm | 80% | 1 m/s | 4.8 |
| 2008 | 32.7°C | 23.5°C | 28.1°C | 206 mm | 80% | 0.9 m/s | 4.6 |
| 2007 | 35.2°C | 19.7°C | 27.5°C | 324 mm | 79% | 1 m/s | 4.2 |
| 2006 | 34.8°C | 22.7°C | 28.8°C | 203 mm | 79% | 1 m/s | 4.6 |
| 2005 | 35.3°C | 23.6°C | 29.5°C | 132 mm | 75% | 0.9 m/s | 4.6 |
| 2004 | 31.9°C | 22.0°C | 26.9°C | 163 mm | 82% | 1 m/s | 3.9 |
| 2003 | 32.1°C | 23.5°C | 27.8°C | 267 mm | 82% | 0.9 m/s | 4.3 |
| 2002 | 35.3°C | 21.1°C | 28.2°C | 227 mm | 79% | 1.1 m/s | 4.7 |
| 2001 | 32.7°C | 23.3°C | 28.0°C | 211 mm | 82% | 0.8 m/s | 4.2 |
| 2000 | 35.5°C | 21.4°C | 28.5°C | 358 mm | 82% | 1 m/s | 4.3 |
| 1999 | 33.7°C | 23.5°C | 28.6°C | 256 mm | 80% | 0.7 m/s | 4.5 |
| 1998 | 34.4°C | 23.3°C | 28.8°C | 106 mm | 76% | 0.8 m/s | 4.9 |
| 1997 ❄️ | 34.2°C | 18.7°C | 26.4°C | 204 mm | 83% | 1.1 m/s | 4.1 |
| 1996 | 35.1°C | 22.8°C | 29.0°C | 145 mm | 80% | 1 m/s | 4.8 |
| 1995 | 36.0°C | 20.1°C | 28.0°C | 358 mm | 83% | 1.2 m/s | 4.6 |
| 1994 | 34.6°C | 22.1°C | 28.4°C | 268 mm | 78% | 0.8 m/s | 5 |
| 1993 | 34.7°C | 21.9°C | 28.3°C | 318 mm | 81% | 1 m/s | 4.1 |
| 1992 | 34.6°C | 21.2°C | 27.9°C | 176 mm | 79% | 0.8 m/s | 4.6 |
| 1991 | 32.3°C | 22.4°C | 27.3°C | 440 mm | 84% | 0.9 m/s | 4 |
| 1990 🌧️ | 35.4°C | 20.3°C | 27.9°C | 487 mm | 83% | 1.1 m/s | 4 |
| 1989 | 32.8°C | 22.4°C | 27.6°C | 308 mm | 84% | 1.1 m/s | 4.6 |
| 1988 | 33.8°C | 22.2°C | 28.0°C | 306 mm | 84% | 1.2 m/s | 4.3 |
| 1987 | 33.2°C | 20.7°C | 27.0°C | 438 mm | 84% | 0.8 m/s | 4.1 |
| 1986 | 32.9°C | 20.7°C | 26.8°C | 231 mm | 81% | 1.2 m/s | 4 |
| 1985 | 33.8°C | 22.7°C | 28.2°C | 296 mm | 84% | 1 m/s | 4.8 |
| 1984 | 34.0°C | 20.7°C | 27.4°C | 275 mm | 83% | 1 m/s | 4.3 |
| 1983 | 34.5°C | 22.0°C | 28.3°C | 386 mm | 82% | 1.1 m/s | — |
| 1982 | 35.3°C | 21.8°C | 28.5°C | 222 mm | 81% | 1.2 m/s | — |
| 1981 | 33.1°C | 22.7°C | 27.9°C | 250 mm | 83% | 1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34.4°C with lows near 22.4°C (mean 28.4°C), based on 45 years of NASA POWER data.
September averages 278 mm of rainfall in Sivasagar, a relatively wet time of year. The wettest on record was 487 mm in 1990.
The hottest September reached 37.3°C in 2024. The coldest dipped to 18.7°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 34.1°C to 35.8°C and overnight lows from 22°C to 23.9°C over the same span.
September is one of the warmer months of the year in Sivasagar and a relatively wet time of year, so plan for around 34.4°C daytime highs and 22.4°C at night.
Not quite — September is the 9th coolest month in Sivasagar, averaging 28.4°C.
For September in Sivasagar, pack light, breathable clothing and sun protection, with typical highs of 34.4°C and lows of 22.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 82% — quite humid.
Average wind speed in September is 1 m/s. The windiest September on record averaged 1.6 m/s (2012).
The wettest September on record was 1990 with 487 mm. On average, September sees 278 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 Sivasagar 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.
