September is one of the warmer months of the year in Jamui, with average highs near 33.1°C and lows around 22.4°C (mean 27.8°C). It is a relatively wet time of year, averaging 187 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Jamui. Across 45 years of records, the warmest September in Jamui was 1989 — when the month averaged 29.9°C — while the coldest was 1984 at 24.5°C. Typical September days reach 33.1°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 | 27.6°C | 27.5°C | 27.8°C | 28.0°C | 28.3°C | +0.7°C |
| Avg High | 33.4°C | 32.9°C | 32.7°C | 33.5°C | 33.1°C | -0.3°C |
| Avg Low | 21.8°C | 22.1°C | 22.8°C | 22.4°C | 23.5°C | +1.7°C |
| Avg Rain | 177 mm | 170 mm | 182 mm | 193 mm | 230 mm | +53 mm |
September temperatures in Jamui have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 17.8°C (1994) to a record high of 36.1°C (1989).
Rainfall in September is a relatively wet time of year, averaging 187 mm, with a wettest year of 381 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Jamui
September is a good time to visit Jamui, with days averaging 33.1°C and nights around 22.4°C (mean 27.8°C, warmer than Jamui's yearly average) and higher rainfall. February and November are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 32.9°C | 23.8°C | 28.3°C | 144 mm | 86% | 1.4 m/s | 4.4 |
| 2024 | 33.3°C | 23.5°C | 28.4°C | 283 mm | 88% | 2.3 m/s | 4.4 |
| 2023 | 33.1°C | 23.8°C | 28.5°C | 343 mm | 88% | 1.9 m/s | 4.1 |
| 2022 | 33.4°C | 23.5°C | 28.5°C | 162 mm | 85% | 1.7 m/s | 4 |
| 2021 | 33.1°C | 23.9°C | 28.5°C | 153 mm | 87% | 2.1 m/s | 4.3 |
| 2020 | 33.0°C | 22.5°C | 27.7°C | 296 mm | 87% | 1.5 m/s | 4 |
| 2019 🌧️ | 34.1°C | 23.2°C | 28.7°C | 381 mm | 86% | 2.1 m/s | 3.9 |
| 2018 | 33.6°C | 23.0°C | 28.3°C | 95 mm | 83% | 2 m/s | 4.6 |
| 2017 | 33.3°C | 23.5°C | 28.4°C | 149 mm | 86% | 1.6 m/s | 4.6 |
| 2016 | 33.0°C | 24.1°C | 28.6°C | 331 mm | 88% | 1.6 m/s | 4.2 |
| 2015 | 33.8°C | 21.7°C | 27.8°C | 147 mm | 82% | 1.8 m/s | 5.1 |
| 2014 | 33.2°C | 21.6°C | 27.4°C | 151 mm | 85% | 1.8 m/s | 4.7 |
| 2013 | 34.4°C | 23.2°C | 28.8°C | 146 mm | 80% | 1.8 m/s | 4.7 |
| 2012 | 32.8°C | 19.9°C | 26.3°C | 154 mm | 86% | 1.8 m/s | 4.5 |
| 2011 | 33.2°C | 22.3°C | 27.7°C | 234 mm | 89% | 2.6 m/s | 4.2 |
| 2010 | 33.7°C | 21.4°C | 27.6°C | 138 mm | 84% | 2 m/s | 4.6 |
| 2009 | 32.8°C | 23.7°C | 28.3°C | 170 mm | 86% | 1.9 m/s | 4.7 |
| 2008 | 32.8°C | 22.5°C | 27.7°C | 148 mm | 86% | 1.7 m/s | 4.7 |
| 2007 | 32.1°C | 23.3°C | 27.7°C | 278 mm | 88% | 2.2 m/s | 4.5 |
| 2006 | 32.7°C | 23.3°C | 28.0°C | 281 mm | 87% | 2.2 m/s | 4.4 |
| 2005 | 33.1°C | 23.4°C | 28.3°C | 107 mm | 85% | 2.1 m/s | 4.8 |
| 2004 | 34.0°C | 22.3°C | 28.1°C | 95 mm | 85% | 2 m/s | 4.3 |
| 2003 | 32.6°C | 23.6°C | 28.1°C | 147 mm | 86% | 2.1 m/s | 4.4 |
| 2002 | 32.5°C | 21.9°C | 27.2°C | 176 mm | 85% | 2.1 m/s | 4.5 |
| 2001 | 32.1°C | 22.3°C | 27.2°C | 173 mm | 86% | 1.6 m/s | 4.5 |
| 2000 | 32.2°C | 21.8°C | 27.0°C | 244 mm | 88% | 2.5 m/s | 4 |
| 1999 | 32.0°C | 22.7°C | 27.4°C | 98 mm | 89% | 2.6 m/s | 4.3 |
| 1998 | 32.7°C | 23.7°C | 28.2°C | 239 mm | 88% | 2.1 m/s | 4.4 |
| 1997 | 32.3°C | 20.8°C | 26.5°C | 122 mm | 86% | 1.6 m/s | 4.6 |
| 1996 | 32.7°C | 23.4°C | 28.0°C | 135 mm | 85% | 1.5 m/s | 4.7 |
| 1995 | 32.2°C | 22.3°C | 27.2°C | 247 mm | 87% | 2.3 m/s | 4.2 |
| 1994 | 32.2°C | 17.8°C | 25.0°C | 134 mm | 83% | 2.3 m/s | 4.7 |
| 1993 | 32.9°C | 23.2°C | 28.1°C | 318 mm | 87% | 2.2 m/s | 4 |
| 1992 | 35.7°C | 22.1°C | 28.9°C | 58 mm | 78% | 2.2 m/s | 5.1 |
| 1991 | 32.7°C | 22.2°C | 27.4°C | 208 mm | 87% | 1.8 m/s | 4.2 |
| 1990 | 33.8°C | 22.5°C | 28.1°C | 140 mm | 87% | 2 m/s | 4.4 |
| 1989 🔥 | 36.1°C | 23.7°C | 29.9°C | 150 mm | 79% | 2.1 m/s | 4.5 |
| 1988 | 33.5°C | 22.7°C | 28.1°C | 125 mm | 85% | 1.7 m/s | 5 |
| 1987 | 32.7°C | 21.5°C | 27.1°C | 348 mm | 88% | 2 m/s | 4.5 |
| 1986 | 34.1°C | 21.6°C | 27.9°C | 110 mm | 80% | 2.5 m/s | 4.5 |
| 1985 | 32.5°C | 22.1°C | 27.3°C | 255 mm | 86% | 1.8 m/s | 5 |
| 1984 ❄️ | 31.0°C | 18.1°C | 24.5°C | 201 mm | 87% | 1.9 m/s | 4.8 |
| 1983 | 35.0°C | 23.9°C | 29.5°C | 87 mm | 77% | 2.2 m/s | — |
| 1982 | 33.7°C | 19.9°C | 26.8°C | 112 mm | 81% | 2 m/s | — |
| 1981 | 32.4°C | 23.0°C | 27.7°C | 203 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 33.1°C with lows near 22.4°C (mean 27.8°C), based on 45 years of NASA POWER data.
September averages 187 mm of rainfall in Jamui, a relatively wet time of year. The wettest on record was 381 mm in 2019.
The hottest September reached 36.1°C in 1989. The coldest dipped to 17.8°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.2°C. Daytime highs moved from 32.9°C to 33.2°C and overnight lows from 21.4°C to 23.7°C over the same span.
September is one of the warmer months of the year in Jamui and a relatively wet time of year, so plan for around 33.1°C daytime highs and 22.4°C at night.
Not quite — September is the 7th coolest month in Jamui, averaging 27.8°C.
For September in Jamui, pack light, breathable clothing and sun protection, with typical highs of 33.1°C and lows of 22.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.6 m/s (1999).
The wettest September on record was 2019 with 381 mm. On average, September sees 187 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 Jamui 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.
