September is one of the warmer months of the year in Vaishali, with average highs near 31.5°C and lows around 24.9°C (mean 28.2°C). It is a relatively wet time of year, averaging 177 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Vaishali. Across 45 years of records, the warmest September in Vaishali was 1983 — when the month averaged 30.2°C — while the coldest was 1984 at 26.7°C. Typical September days reach 31.5°C with nights near 24.9°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Vaishali, averaging 177 mm of rainfall. The wettest September on record was 1987 with 410 mm, while the driest was 1992 at 46 mm.
Relative humidity in Vaishali during September averages 84%. The most humid September was 1987 at 89%, and the least humid was 1983 at 71%.
September receives about 4.7 kWh/m²/day of solar energy in Vaishali. The sunniest Septembers were 1992 and 2015 at 5.2 kWh/m²/day, and the cloudiest were 2016, 2019 and 2022 at 3.9.
Average wind speed in Vaishali during September is 2 m/s. The windiest Septembers were 1999 and 2000 at 2.6 m/s, while the calmest was 1996 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.2°C | 27.9°C | 28.0°C | 28.4°C | 28.7°C | +0.5°C |
| Avg High | 31.7°C | 31.2°C | 31.3°C | 31.8°C | 31.8°C | +0.1°C |
| Avg Low | 24.7°C | 24.6°C | 24.7°C | 25.0°C | 25.7°C | +1°C |
| Avg Rain | 182 mm | 173 mm | 165 mm | 194 mm | 164 mm | -18 mm |
September temperatures in Vaishali have risen by about 0.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 17°C (1994) to a record high of 38.2°C (1983).
Rainfall in September is a relatively wet time of year, averaging 177 mm, with a wettest year of 410 mm.
A good time to visit Vaishali
September is a good time to visit Vaishali, with days averaging 31.5°C and nights around 24.9°C (mean 28.2°C, warmer than Vaishali's yearly average) and higher rainfall. November and February are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 31.8°C | 28.7°C | 25.6°C | 33.2°C | 24.5°C | 144 mm | 85% | 1.5 m/s | 4.4 |
| 2024 | 32.1°C | 29.0°C | 25.9°C | 36.1°C | 23.7°C | 159 mm | 85% | 2.2 m/s | 4.4 |
| 2023 | 32.1°C | 29.0°C | 25.9°C | 34.8°C | 24.5°C | 171 mm | 85% | 2 m/s | 4.3 |
| 2022 | 31.9°C | 28.7°C | 25.5°C | 34.3°C | 23.7°C | 130 mm | 83% | 1.8 m/s | 3.9 |
| 2021 | 31.2°C | 28.3°C | 25.5°C | 33.1°C | 24.4°C | 129 mm | 88% | 2.1 m/s | 4.6 |
| 2020 | 31.7°C | 28.6°C | 25.6°C | 33.8°C | 22.0°C | 251 mm | 86% | 1.5 m/s | 4.1 |
| 2019 | 31.6°C | 28.7°C | 25.7°C | 35.4°C | 22.8°C | 329 mm | 84% | 2.1 m/s | 3.9 |
| 2018 | 33.1°C | 29.1°C | 25.1°C | 35.9°C | 23.1°C | 80 mm | 80% | 2.1 m/s | 4.8 |
| 2017 | 32.4°C | 29.1°C | 25.8°C | 34.2°C | 23.3°C | 79 mm | 84% | 1.5 m/s | 4.7 |
| 2016 | 31.1°C | 28.3°C | 25.5°C | 34.6°C | 24.2°C | 314 mm | 87% | 1.5 m/s | 3.9 |
| 2015 | 32.5°C | 28.5°C | 24.5°C | 34.3°C | 20.7°C | 72 mm | 81% | 1.8 m/s | 5.2 |
| 2014 | 31.1°C | 27.9°C | 24.6°C | 33.0°C | 21.3°C | 235 mm | 86% | 1.8 m/s | 4.9 |
| 2013 | 32.1°C | 28.5°C | 25.0°C | 33.6°C | 23.3°C | 236 mm | 81% | 1.5 m/s | 5 |
| 2012 | 31.1°C | 27.5°C | 24.0°C | 33.2°C | 20.4°C | 204 mm | 84% | 1.7 m/s | 4.6 |
| 2011 | 30.8°C | 27.9°C | 25.0°C | 34.0°C | 22.8°C | 276 mm | 87% | 2.4 m/s | 4.5 |
| 2010 | 31.7°C | 28.3°C | 25.0°C | 33.5°C | 21.6°C | 114 mm | 84% | 2 m/s | 4.8 |
| 2009 | 31.8°C | 28.4°C | 24.9°C | 33.2°C | 23.8°C | 137 mm | 84% | 1.9 m/s | 5 |
| 2008 | 30.9°C | 27.8°C | 24.6°C | 32.8°C | 21.9°C | 168 mm | 87% | 1.7 m/s | 5.1 |
| 2007 | 30.5°C | 27.7°C | 24.8°C | 33.1°C | 23.2°C | 299 mm | 88% | 2.2 m/s | 4.4 |
| 2006 | 31.1°C | 27.8°C | 24.5°C | 33.1°C | 22.8°C | 207 mm | 85% | 2.1 m/s | 4.5 |
| 2005 | 32.0°C | 28.6°C | 25.1°C | 33.6°C | 22.7°C | 83 mm | 84% | 2.1 m/s | 4.9 |
| 2004 | 31.8°C | 28.1°C | 24.4°C | 34.8°C | 21.8°C | 74 mm | 82% | 1.8 m/s | 4.7 |
| 2003 | 31.3°C | 28.4°C | 25.4°C | 33.1°C | 23.5°C | 144 mm | 87% | 2.2 m/s | 4.8 |
| 2002 | 32.0°C | 28.2°C | 24.3°C | 35.0°C | 22.7°C | 99 mm | 81% | 2.3 m/s | 4.8 |
| 2001 | 30.8°C | 27.8°C | 24.7°C | 32.7°C | 22.0°C | 210 mm | 86% | 1.6 m/s | 4.6 |
| 2000 | 30.6°C | 27.6°C | 24.5°C | 32.6°C | 21.7°C | 227 mm | 87% | 2.6 m/s | 4.2 |
| 1999 | 31.0°C | 28.0°C | 25.0°C | 33.0°C | 22.5°C | 91 mm | 87% | 2.6 m/s | 4.8 |
| 1998 | 31.1°C | 28.1°C | 25.2°C | 33.6°C | 24.2°C | 245 mm | 87% | 2.1 m/s | 4.7 |
| 1997 | 31.2°C | 27.9°C | 24.5°C | 32.5°C | 21.7°C | 127 mm | 85% | 1.5 m/s | 4.7 |
| 1996 | 31.5°C | 28.2°C | 25.0°C | 33.0°C | 23.5°C | 172 mm | 85% | 1.4 m/s | 4.9 |
| 1995 | 30.6°C | 27.5°C | 24.5°C | 32.8°C | 21.7°C | 258 mm | 86% | 2.4 m/s | 4.8 |
| 1994 | 30.8°C | 26.9°C | 23.1°C | 32.7°C | 17.0°C | 162 mm | 84% | 2.4 m/s | 5 |
| 1993 | 30.3°C | 27.4°C | 24.5°C | 33.0°C | 23.1°C | 342 mm | 88% | 2.2 m/s | 4.5 |
| 1992 | 32.9°C | 28.5°C | 24.2°C | 35.6°C | 21.7°C | 46 mm | 78% | 2.2 m/s | 5.2 |
| 1991 | 31.4°C | 28.0°C | 24.6°C | 33.1°C | 22.3°C | 180 mm | 84% | 1.5 m/s | 4.5 |
| 1990 | 31.2°C | 28.1°C | 25.1°C | 34.4°C | 22.6°C | 111 mm | 87% | 2.1 m/s | 4.5 |
| 1989 | 33.1°C | 29.4°C | 25.7°C | 37.0°C | 24.2°C | 142 mm | 77% | 2 m/s | 4.7 |
| 1988 | 31.7°C | 28.4°C | 25.2°C | 33.6°C | 22.9°C | 132 mm | 86% | 1.7 m/s | 5.1 |
| 1987 🌧️ | 30.5°C | 27.7°C | 24.9°C | 32.9°C | 20.8°C | 410 mm | 89% | 2.1 m/s | 4.6 |
| 1986 | 31.8°C | 27.8°C | 23.8°C | 34.7°C | 21.0°C | 98 mm | 80% | 2.3 m/s | 4.8 |
| 1985 | 30.5°C | 27.6°C | 24.7°C | 33.8°C | 22.3°C | 269 mm | 88% | 1.8 m/s | 5.1 |
| 1984 ❄️ | 30.1°C | 26.7°C | 23.2°C | 31.5°C | 17.7°C | 228 mm | 87% | 2.1 m/s | 5 |
| 1983 🔥 | 34.4°C | 30.2°C | 26.1°C | 38.2°C | 24.2°C | 56 mm | 71% | 2.4 m/s | — |
| 1982 | 32.6°C | 28.3°C | 23.9°C | 34.6°C | 19.7°C | 107 mm | 81% | 2 m/s | — |
| 1981 | 30.9°C | 27.9°C | 24.9°C | 33.4°C | 23.3°C | 200 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 31.5°C with lows near 24.9°C (mean 28.2°C), based on 45 years of NASA POWER data.
September averages 177 mm of rainfall in Vaishali, a relatively wet time of year. The wettest on record was 410 mm in 1987.
The hottest September reached 38.2°C in 1983. The coldest dipped to 17°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.6°C. Daytime highs moved from 31.7°C to 31.8°C and overnight lows from 24.6°C to 25.7°C over the same span.
September is one of the warmer months of the year in Vaishali and a relatively wet time of year, so plan for around 31.5°C daytime highs and 24.9°C at night.
Not quite — September is the 7th coolest month in Vaishali, averaging 28.2°C.
For September in Vaishali, pack light, breathable clothing and sun protection, with typical highs of 31.5°C and lows of 24.9°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 2.6 m/s (1999).
The wettest September on record was 1987 with 410 mm. On average, September sees 177 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 Vaishali 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.
