September is one of the warmer months of the year in East Champaran, with average highs near 34.1°C and lows around 22.3°C (mean 28.2°C). It is a relatively wet time of year, averaging 179 mm of rainfall and 83% relative humidity across the period.
September is one of the warmer months of the year in East Champaran. Across 45 years of records, the warmest September in East Champaran was 1983 — when the month averaged 31.2°C — while the coldest was 1984 at 25.3°C. Typical September days reach 34.1°C with nights near 22.3°C. The long-term trend is warming, about 0.2°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.1°C | 28.0°C | 28.1°C | 28.2°C | 28.9°C | +0.8°C |
| Avg High | 34.5°C | 34.2°C | 33.9°C | 34.1°C | 34.0°C | -0.5°C |
| Avg Low | 21.7°C | 21.9°C | 22.4°C | 22.2°C | 23.7°C | +2°C |
| Avg Rain | 181 mm | 148 mm | 170 mm | 204 mm | 200 mm | +20 mm |
September temperatures in East Champaran have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 16.9°C (1994) to a record high of 38.2°C (1983).
Rainfall in September is a relatively wet time of year, averaging 179 mm, with a wettest year of 379 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit East Champaran
September is a good time to visit East Champaran, with days averaging 34.1°C and nights around 22.3°C (mean 28.2°C, warmer than East Champaran'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 | 34.1°C | 24.4°C | 29.2°C | 187 mm | 85% | 1.6 m/s | 4.5 |
| 2024 | 37.3°C | 23.9°C | 30.6°C | 231 mm | 85% | 2.1 m/s | 4.4 |
| 2023 | 33.2°C | 24.0°C | 28.6°C | 145 mm | 88% | 2.1 m/s | 4.3 |
| 2022 | 33.0°C | 23.4°C | 28.2°C | 176 mm | 86% | 1.8 m/s | 3.8 |
| 2021 | 32.7°C | 24.3°C | 28.5°C | 131 mm | 89% | 2 m/s | 4.5 |
| 2020 | 33.9°C | 22.3°C | 28.1°C | 332 mm | 87% | 1.5 m/s | 4 |
| 2019 | 35.2°C | 21.2°C | 28.2°C | 248 mm | 84% | 2.2 m/s | 3.7 |
| 2018 | 35.6°C | 23.8°C | 29.7°C | 98 mm | 78% | 2.2 m/s | 4.8 |
| 2017 | 33.8°C | 24.4°C | 29.1°C | 89 mm | 85% | 1.5 m/s | 4.8 |
| 2016 | 35.5°C | 23.4°C | 29.4°C | 243 mm | 85% | 1.4 m/s | 3.8 |
| 2015 | 34.2°C | 19.1°C | 26.6°C | 123 mm | 82% | 1.5 m/s | 5.1 |
| 2014 | 33.5°C | 21.2°C | 27.4°C | 245 mm | 86% | 1.7 m/s | 4.6 |
| 2013 | 33.4°C | 22.8°C | 28.1°C | 255 mm | 83% | 1.5 m/s | 4.9 |
| 2012 | 33.4°C | 21.3°C | 27.3°C | 289 mm | 84% | 1.7 m/s | 4.6 |
| 2011 | 34.0°C | 22.7°C | 28.4°C | 264 mm | 86% | 2.1 m/s | 4.6 |
| 2010 | 32.8°C | 21.9°C | 27.3°C | 181 mm | 87% | 2.1 m/s | 4.4 |
| 2009 | 34.0°C | 23.3°C | 28.7°C | 96 mm | 85% | 1.8 m/s | 5.1 |
| 2008 | 32.5°C | 21.8°C | 27.1°C | 231 mm | 87% | 1.6 m/s | 5.1 |
| 2007 | 32.5°C | 22.0°C | 27.3°C | 310 mm | 88% | 2 m/s | 4.3 |
| 2006 | 33.4°C | 22.1°C | 27.7°C | 234 mm | 85% | 2 m/s | 4.7 |
| 2005 | 33.8°C | 23.0°C | 28.4°C | 83 mm | 85% | 1.9 m/s | 4.9 |
| 2004 | 34.1°C | 22.4°C | 28.3°C | 98 mm | 82% | 1.5 m/s | 4.8 |
| 2003 | 35.5°C | 22.8°C | 29.1°C | 119 mm | 79% | 2.3 m/s | 4.3 |
| 2002 | 37.1°C | 23.5°C | 30.3°C | 93 mm | 72% | 2.5 m/s | 4.6 |
| 2001 | 32.7°C | 22.2°C | 27.5°C | 232 mm | 85% | 1.5 m/s | 4.3 |
| 2000 | 32.9°C | 20.7°C | 26.8°C | 203 mm | 86% | 2.4 m/s | 4.2 |
| 1999 | 35.0°C | 23.0°C | 29.0°C | 80 mm | 80% | 2.5 m/s | 4.9 |
| 1998 | 33.3°C | 23.8°C | 28.5°C | 199 mm | 86% | 2.1 m/s | 5.1 |
| 1997 | 33.3°C | 21.6°C | 27.4°C | 109 mm | 83% | 1.7 m/s | 4.5 |
| 1996 | 33.2°C | 22.8°C | 28.0°C | 152 mm | 84% | 1.6 m/s | 5.4 |
| 1995 | 34.1°C | 22.2°C | 28.1°C | 149 mm | 83% | 2.2 m/s | 5 |
| 1994 | 35.1°C | 16.9°C | 26.0°C | 178 mm | 79% | 2.1 m/s | 4.9 |
| 1993 | 34.2°C | 22.4°C | 28.3°C | 232 mm | 84% | 2.4 m/s | 4.6 |
| 1992 | 36.0°C | 21.6°C | 28.8°C | 74 mm | 72% | 2.1 m/s | 5 |
| 1991 | 33.5°C | 22.4°C | 28.0°C | 179 mm | 81% | 1.7 m/s | 4.4 |
| 1990 | 34.1°C | 22.3°C | 28.2°C | 123 mm | 85% | 2.1 m/s | 4.3 |
| 1989 | 36.6°C | 23.1°C | 29.8°C | 120 mm | 76% | 2.2 m/s | 4.4 |
| 1988 | 33.5°C | 22.1°C | 27.8°C | 130 mm | 86% | 1.8 m/s | 4.9 |
| 1987 🌧️ | 32.8°C | 21.8°C | 27.3°C | 379 mm | 88% | 1.8 m/s | 4.3 |
| 1986 | 35.0°C | 20.7°C | 27.8°C | 88 mm | 78% | 2.4 m/s | 5 |
| 1985 | 33.2°C | 22.2°C | 27.7°C | 283 mm | 89% | 1.9 m/s | 4.4 |
| 1984 ❄️ | 31.7°C | 18.9°C | 25.3°C | 256 mm | 86% | 2 m/s | 4.8 |
| 1983 🔥 | 38.2°C | 24.3°C | 31.2°C | 49 mm | 70% | 2.6 m/s | — |
| 1982 | 35.7°C | 19.6°C | 27.6°C | 143 mm | 82% | 1.8 m/s | — |
| 1981 | 33.5°C | 22.7°C | 28.1°C | 179 mm | 87% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34.1°C with lows near 22.3°C (mean 28.2°C), based on 45 years of NASA POWER data.
September averages 179 mm of rainfall in East Champaran, a relatively wet time of year. The wettest on record was 379 mm in 1987.
The hottest September reached 38.2°C in 1983. The coldest dipped to 16.9°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°C. Daytime highs moved from 34.5°C to 34.1°C and overnight lows from 21.5°C to 24°C over the same span.
September is one of the warmer months of the year in East Champaran and a relatively wet time of year, so plan for around 34.1°C daytime highs and 22.3°C at night.
Not quite — September is the 7th coolest month in East Champaran, averaging 28.2°C.
For September in East Champaran, pack light, breathable clothing and sun protection, with typical highs of 34.1°C and lows of 22.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 83% — quite humid.
Average wind speed in September is 1.9 m/s. The windiest September on record averaged 2.6 m/s (1983).
The wettest September on record was 1987 with 379 mm. On average, September sees 179 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 East Champaran 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.
