September is one of the warmer months of the year in Purnia, with average highs near 33.8°C and lows around 22.6°C (mean 28.2°C). It is a relatively wet time of year, averaging 204 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Purnia. Across 45 years of records, the warmest September in Purnia was 1993 — when the month averaged 30.3°C — while the coldest was 1984 at 25.9°C. Typical September days reach 33.8°C with nights near 22.6°C. The long-term September temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.8°C | 28.5°C | 27.9°C | 28.1°C | 28.7°C | +0.9°C |
| Avg High | 33.5°C | 34.9°C | 33.2°C | 33.5°C | 33.6°C | +0.1°C |
| Avg Low | 22.0°C | 22.1°C | 22.6°C | 22.6°C | 23.9°C | +1.9°C |
| Avg Rain | 183 mm | 133 mm | 199 mm | 234 mm | 311 mm | +128 mm |
September temperatures in Purnia have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 19.6°C (1994) to a record high of 37.6°C (1992).
Rainfall in September is a relatively wet time of year, averaging 204 mm, with a wettest year of 566 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Purnia
September is a good time to visit Purnia, with days averaging 33.8°C and nights around 22.6°C (mean 28.2°C, warmer than Purnia's yearly average) and higher rainfall. November and February are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 33.6°C | 24.6°C | 29.1°C | 239 mm | 86% | 1.3 m/s | 4.6 |
| 2024 | 35.9°C | 23.2°C | 29.6°C | 348 mm | 87% | 1.9 m/s | 4.7 |
| 2023 | 33.9°C | 24.5°C | 29.2°C | 333 mm | 88% | 1.8 m/s | 4.2 |
| 2022 | 32.4°C | 23.5°C | 27.9°C | 261 mm | 89% | 1.8 m/s | 4 |
| 2021 | 32.4°C | 23.9°C | 28.1°C | 118 mm | 90% | 1.8 m/s | 4.7 |
| 2020 🌧️ | 33.2°C | 23.8°C | 28.5°C | 566 mm | 89% | 1.5 m/s | 3.5 |
| 2019 | 34.2°C | 21.6°C | 27.9°C | 373 mm | 88% | 1.9 m/s | 3.8 |
| 2018 | 33.5°C | 23.0°C | 28.3°C | 161 mm | 85% | 1.7 m/s | 4.8 |
| 2017 | 33.5°C | 24.6°C | 29.0°C | 135 mm | 89% | 1.7 m/s | 4.5 |
| 2016 | 32.5°C | 23.4°C | 28.0°C | 385 mm | 89% | 1.4 m/s | 4.2 |
| 2015 | 33.9°C | 21.6°C | 27.8°C | 194 mm | 85% | 1.5 m/s | 4.9 |
| 2014 | 33.7°C | 22.8°C | 28.2°C | 217 mm | 87% | 1.5 m/s | 4.5 |
| 2013 | 33.1°C | 22.6°C | 27.8°C | 128 mm | 85% | 1.6 m/s | 4.9 |
| 2012 | 34.8°C | 22.0°C | 28.4°C | 221 mm | 86% | 2 m/s | 4.5 |
| 2011 | 33.5°C | 22.9°C | 28.2°C | 255 mm | 89% | 2.4 m/s | 4.5 |
| 2010 | 32.2°C | 21.7°C | 26.9°C | 268 mm | 89% | 1.7 m/s | 4.7 |
| 2009 | 33.1°C | 23.3°C | 28.2°C | 106 mm | 87% | 1.8 m/s | 4.9 |
| 2008 | 32.6°C | 22.4°C | 27.5°C | 135 mm | 87% | 1.5 m/s | 4.8 |
| 2007 | 32.4°C | 21.4°C | 26.9°C | 290 mm | 88% | 2 m/s | 4.1 |
| 2006 | 34.8°C | 22.3°C | 28.6°C | 429 mm | 86% | 2.2 m/s | 4.4 |
| 2005 | 33.6°C | 23.8°C | 28.7°C | 128 mm | 86% | 1.5 m/s | 4.9 |
| 2004 | 32.5°C | 22.6°C | 27.6°C | 158 mm | 88% | 1.9 m/s | 4.2 |
| 2003 | 33.4°C | 23.0°C | 28.2°C | 138 mm | 86% | 2.2 m/s | 4.5 |
| 2002 | 33.6°C | 21.8°C | 27.7°C | 184 mm | 85% | 2 m/s | 4.8 |
| 2001 | 32.3°C | 23.3°C | 27.8°C | 239 mm | 87% | 1.6 m/s | 4.4 |
| 2000 | 33.6°C | 22.3°C | 27.9°C | 180 mm | 86% | 2.1 m/s | 4.1 |
| 1999 | 31.9°C | 21.9°C | 26.9°C | 118 mm | 89% | 2.3 m/s | 4.2 |
| 1998 | 33.2°C | 23.3°C | 28.3°C | 164 mm | 87% | 1.7 m/s | 4.5 |
| 1997 | 33.7°C | 21.1°C | 27.4°C | 169 mm | 85% | 1.7 m/s | 4.7 |
| 1996 | 35.2°C | 23.0°C | 29.1°C | 92 mm | 79% | 1.6 m/s | 4.7 |
| 1995 | 34.9°C | 22.2°C | 28.5°C | 86 mm | 82% | 2.6 m/s | 4.6 |
| 1994 | 36.8°C | 19.6°C | 28.2°C | 76 mm | 68% | 2.1 m/s | 5.1 |
| 1993 🔥 | 37.6°C | 23.1°C | 30.3°C | 143 mm | 76% | 2.4 m/s | 4.3 |
| 1992 | 37.6°C | 21.6°C | 29.6°C | 74 mm | 69% | 1.9 m/s | 4.9 |
| 1991 | 32.5°C | 23.4°C | 27.9°C | 287 mm | 88% | 2 m/s | 4.1 |
| 1990 | 35.7°C | 22.2°C | 28.9°C | 127 mm | 81% | 2 m/s | 4.3 |
| 1989 | 35.9°C | 23.6°C | 29.8°C | 170 mm | 79% | 2.1 m/s | 4.1 |
| 1988 | 34.7°C | 21.8°C | 28.3°C | 77 mm | 82% | 1.8 m/s | 5 |
| 1987 | 32.7°C | 21.7°C | 27.2°C | 239 mm | 88% | 1.7 m/s | 4.6 |
| 1986 | 33.3°C | 21.6°C | 27.5°C | 209 mm | 85% | 2.3 m/s | 4.5 |
| 1985 | 32.8°C | 23.0°C | 27.9°C | 203 mm | 86% | 1.6 m/s | 5 |
| 1984 ❄️ | 31.8°C | 20.0°C | 25.9°C | 267 mm | 87% | 1.7 m/s | 4.5 |
| 1983 | 33.8°C | 23.9°C | 28.9°C | 136 mm | 84% | 2.1 m/s | — |
| 1982 | 33.5°C | 20.0°C | 26.8°C | 183 mm | 83% | 1.5 m/s | — |
| 1981 | 33.2°C | 22.2°C | 27.7°C | 162 mm | 88% | 1.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.8°C with lows near 22.6°C (mean 28.2°C), based on 45 years of NASA POWER data.
September averages 204 mm of rainfall in Purnia, a relatively wet time of year. The wettest on record was 566 mm in 2020.
The hottest September reached 37.6°C in 1992. The coldest dipped to 19.6°C in 1994.
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°C to 33.6°C and overnight lows from 21.8°C to 23.9°C over the same span.
September is one of the warmer months of the year in Purnia and a relatively wet time of year, so plan for around 33.8°C daytime highs and 22.6°C at night.
Not quite — September is the 7th coolest month in Purnia, averaging 28.2°C.
For September in Purnia, pack light, breathable clothing and sun protection, with typical highs of 33.8°C and lows of 22.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 1.8 m/s. The windiest September on record averaged 2.6 m/s (1995).
The wettest September on record was 2020 with 566 mm. On average, September sees 204 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 Purnia 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.
