September is one of the warmer months of the year in Muzaffarpur, with average highs near 34.2°C and lows around 22.4°C (mean 28.3°C). It is a relatively wet time of year, averaging 188 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Muzaffarpur. Across 45 years of records, the warmest September in Muzaffarpur was 1983 — when the month averaged 31.2°C — while the coldest was 1984 at 25.1°C. Typical September days reach 34.2°C with nights near 22.4°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 | 28.2°C | 28.5°C | 28.9°C | +0.8°C |
| Avg High | 34.3°C | 34.0°C | 33.9°C | 34.7°C | 34.1°C | -0.2°C |
| Avg Low | 21.9°C | 21.9°C | 22.5°C | 22.3°C | 23.7°C | +1.8°C |
| Avg Rain | 192 mm | 164 mm | 171 mm | 209 mm | 215 mm | +23 mm |
September temperatures in Muzaffarpur have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 17.2°C (1994) to a record high of 38.2°C (1983).
Rainfall in September is a relatively wet time of year, averaging 188 mm, with a wettest year of 425 mm.
Daytime highs and overnight lows have shifted differently — highs rose 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 Muzaffarpur
September is a good time to visit Muzaffarpur, with days averaging 34.2°C and nights around 22.4°C (mean 28.3°C, warmer than Muzaffarpur'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 | 34.4°C | 24.3°C | 29.3°C | 203 mm | 83% | 1.5 m/s | 4.6 |
| 2024 | 36.5°C | 24.1°C | 30.3°C | 236 mm | 85% | 2.2 m/s | 4.5 |
| 2023 | 33.4°C | 23.5°C | 28.5°C | 243 mm | 88% | 2.1 m/s | 4.4 |
| 2022 | 33.8°C | 23.8°C | 28.8°C | 174 mm | 84% | 1.9 m/s | 4 |
| 2021 | 32.9°C | 24.0°C | 28.5°C | 109 mm | 89% | 2 m/s | 4.8 |
| 2020 | 33.5°C | 22.3°C | 27.9°C | 326 mm | 87% | 1.5 m/s | 4 |
| 2019 | 35.4°C | 21.9°C | 28.6°C | 310 mm | 82% | 2.3 m/s | 4 |
| 2018 | 36.4°C | 24.1°C | 30.3°C | 110 mm | 77% | 2.2 m/s | 4.9 |
| 2017 | 34.8°C | 24.0°C | 29.4°C | 92 mm | 83% | 1.5 m/s | 4.7 |
| 2016 | 35.1°C | 23.4°C | 29.2°C | 323 mm | 86% | 1.4 m/s | 3.9 |
| 2015 | 34.3°C | 19.8°C | 27.0°C | 124 mm | 82% | 1.6 m/s | 4.9 |
| 2014 | 33.5°C | 21.5°C | 27.5°C | 248 mm | 86% | 1.8 m/s | 4.6 |
| 2013 | 34.7°C | 22.5°C | 28.6°C | 240 mm | 81% | 1.7 m/s | 5.1 |
| 2012 | 34.2°C | 21.2°C | 27.7°C | 233 mm | 84% | 1.9 m/s | 4.6 |
| 2011 | 35.2°C | 22.6°C | 28.9°C | 271 mm | 86% | 2.4 m/s | 4.6 |
| 2010 | 33.5°C | 22.0°C | 27.8°C | 139 mm | 85% | 2.1 m/s | 4.7 |
| 2009 | 34.3°C | 23.5°C | 28.9°C | 107 mm | 85% | 1.9 m/s | 5 |
| 2008 | 32.6°C | 22.1°C | 27.3°C | 208 mm | 87% | 1.7 m/s | 5 |
| 2007 | 32.7°C | 22.1°C | 27.4°C | 314 mm | 88% | 2.2 m/s | 4.3 |
| 2006 | 33.8°C | 22.2°C | 28.0°C | 245 mm | 85% | 2.3 m/s | 4.6 |
| 2005 | 34.1°C | 23.6°C | 28.9°C | 78 mm | 83% | 2.1 m/s | 5 |
| 2004 | 34.9°C | 21.9°C | 28.4°C | 74 mm | 81% | 1.7 m/s | 4.7 |
| 2003 | 34.9°C | 23.0°C | 28.9°C | 136 mm | 82% | 2.4 m/s | 4.7 |
| 2002 | 36.3°C | 23.1°C | 29.7°C | 102 mm | 77% | 2.5 m/s | 4.8 |
| 2001 | 32.6°C | 22.1°C | 27.4°C | 237 mm | 86% | 1.6 m/s | 4.5 |
| 2000 | 32.9°C | 21.1°C | 27.0°C | 212 mm | 87% | 2.7 m/s | 4.4 |
| 1999 | 34.7°C | 22.5°C | 28.6°C | 91 mm | 83% | 2.8 m/s | 4.9 |
| 1998 | 33.5°C | 24.0°C | 28.8°C | 231 mm | 87% | 2.1 m/s | 5 |
| 1997 | 33.2°C | 21.0°C | 27.1°C | 116 mm | 84% | 1.6 m/s | 4.7 |
| 1996 | 33.0°C | 22.8°C | 27.9°C | 179 mm | 85% | 1.5 m/s | 5.4 |
| 1995 | 33.7°C | 21.8°C | 27.8°C | 190 mm | 85% | 2.6 m/s | 5 |
| 1994 | 34.1°C | 17.2°C | 25.6°C | 169 mm | 81% | 2.2 m/s | 5.4 |
| 1993 | 33.9°C | 22.9°C | 28.4°C | 302 mm | 86% | 2.4 m/s | 4.7 |
| 1992 | 36.3°C | 22.0°C | 29.1°C | 56 mm | 73% | 2.2 m/s | 5 |
| 1991 | 33.3°C | 22.4°C | 27.9°C | 191 mm | 83% | 1.8 m/s | 4.4 |
| 1990 | 34.2°C | 22.6°C | 28.4°C | 119 mm | 85% | 2.1 m/s | 4.2 |
| 1989 | 37.0°C | 23.5°C | 30.3°C | 140 mm | 77% | 2.3 m/s | 4.3 |
| 1988 | 33.7°C | 22.1°C | 27.9°C | 142 mm | 86% | 1.7 m/s | 4.7 |
| 1987 🌧️ | 32.6°C | 21.8°C | 27.2°C | 425 mm | 89% | 1.9 m/s | 4.5 |
| 1986 | 34.9°C | 21.8°C | 28.3°C | 108 mm | 80% | 2.6 m/s | 5.1 |
| 1985 | 32.8°C | 22.6°C | 27.7°C | 294 mm | 89% | 1.8 m/s | 4.5 |
| 1984 ❄️ | 31.7°C | 18.5°C | 25.1°C | 251 mm | 87% | 2 m/s | 4.7 |
| 1983 🔥 | 38.2°C | 24.1°C | 31.2°C | 54 mm | 71% | 2.6 m/s | — |
| 1982 | 34.8°C | 20.1°C | 27.4°C | 124 mm | 81% | 1.9 m/s | — |
| 1981 | 33.3°C | 22.4°C | 27.8°C | 188 mm | 87% | 1.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34.2°C with lows near 22.4°C (mean 28.3°C), based on 45 years of NASA POWER data.
September averages 188 mm of rainfall in Muzaffarpur, a relatively wet time of year. The wettest on record was 425 mm in 1987.
The hottest September reached 38.2°C in 1983. The coldest dipped to 17.2°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.3°C. Daytime highs moved from 34.2°C to 34.2°C and overnight lows from 21.5°C to 23.9°C over the same span.
September is one of the warmer months of the year in Muzaffarpur and a relatively wet time of year, so plan for around 34.2°C daytime highs and 22.4°C at night.
Not quite — September is the 7th coolest month in Muzaffarpur, averaging 28.3°C.
For September in Muzaffarpur, pack light, breathable clothing and sun protection, with typical highs of 34.2°C and lows of 22.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.8 m/s (1999).
The wettest September on record was 1987 with 425 mm. On average, September sees 188 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 Muzaffarpur 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.
