September is one of the warmer months of the year in Basti, with average highs near 31.9°C and lows around 24.3°C (mean 28.1°C). It is a relatively wet time of year, averaging 174 mm of rainfall and 82% relative humidity across the period.
September is one of the warmer months of the year in Basti. Across 45 years of records, the warmest September in Basti was 2015 — when the month averaged 29.8°C — while the coldest were 1982 and 1984 at 26.9°C. Typical September days reach 31.9°C with nights near 24.3°C. The long-term September temperature trend is broadly flat.
September is a relatively wet time of year in Basti, averaging 174 mm of rainfall. The wettest September on record was 2012 with 357 mm, while the driest was 2015 at 21 mm.
Relative humidity in Basti during September averages 82%. The most humid September was 2021 at 89%, and the least humid was 1986 at 65%.
September receives about 4.6 kWh/m²/day of solar energy in Basti. The sunniest September was 2015 at 5.4 kWh/m²/day, and the cloudiest was 2019 at 3.4.
Average wind speed in Basti during September is 1.9 m/s. The windiest September was 1993 at 2.6 m/s, while the calmest was 2001 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.0°C | 28.0°C | 28.1°C | 28.2°C | 28.4°C | +0.4°C |
| Avg High | 32.0°C | 31.9°C | 32.0°C | 31.8°C | 31.7°C | -0.3°C |
| Avg Low | 24.1°C | 24.1°C | 24.2°C | 24.5°C | 25.1°C | +1°C |
| Avg Rain | 181 mm | 146 mm | 163 mm | 184 mm | 215 mm | +35 mm |
September temperatures in Basti have risen by about 0.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 16.2°C (1994) to a record high of 38.5°C (2004).
Rainfall in September is a relatively wet time of year, averaging 174 mm, with a wettest year of 357 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.3°C per decade, narrowing the gap between day and night.
A good time to visit Basti
September is a good time to visit Basti, with days averaging 31.9°C and nights around 24.3°C (mean 28.1°C, warmer than Basti'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 | 31.5°C | 28.5°C | 25.5°C | 34.3°C | 24.3°C | 251 mm | 88% | 1.6 m/s | 4.3 |
| 2024 | 31.4°C | 28.3°C | 25.2°C | 34.4°C | 22.9°C | 261 mm | 87% | 1.9 m/s | 4.4 |
| 2023 | 31.8°C | 28.4°C | 25.1°C | 34.1°C | 23.5°C | 179 mm | 86% | 1.8 m/s | 4.4 |
| 2022 | 31.8°C | 28.4°C | 24.9°C | 35.3°C | 22.6°C | 284 mm | 83% | 2.1 m/s | 4.2 |
| 2021 | 30.7°C | 28.0°C | 25.2°C | 32.5°C | 24.1°C | 196 mm | 89% | 2.1 m/s | 4.6 |
| 2020 | 32.7°C | 28.7°C | 24.7°C | 35.3°C | 20.3°C | 121 mm | 81% | 1.6 m/s | 4 |
| 2019 | 30.4°C | 27.7°C | 24.9°C | 34.4°C | 20.9°C | 330 mm | 88% | 2.2 m/s | 3.4 |
| 2018 | 30.9°C | 27.6°C | 24.2°C | 32.1°C | 20.4°C | 114 mm | 87% | 2.1 m/s | 4.8 |
| 2017 | 32.0°C | 28.5°C | 25.0°C | 33.8°C | 21.8°C | 141 mm | 85% | 1.6 m/s | 4.8 |
| 2016 | 31.9°C | 28.4°C | 24.9°C | 33.7°C | 23.5°C | 160 mm | 85% | 1.6 m/s | 4.3 |
| 2015 🔥 | 35.2°C | 29.8°C | 24.4°C | 37.8°C | 20.0°C | 21 mm | 67% | 1.9 m/s | 5.4 |
| 2014 | 32.7°C | 28.3°C | 24.0°C | 35.1°C | 20.5°C | 163 mm | 78% | 1.8 m/s | 4.6 |
| 2013 | 32.4°C | 28.6°C | 24.8°C | 34.0°C | 23.6°C | 116 mm | 82% | 1.6 m/s | 4.8 |
| 2012 🌧️ | 31.0°C | 27.4°C | 23.8°C | 32.9°C | 20.9°C | 357 mm | 86% | 1.9 m/s | 4.6 |
| 2011 | 31.0°C | 27.8°C | 24.6°C | 32.5°C | 22.3°C | 177 mm | 87% | 2 m/s | 4.7 |
| 2010 | 30.5°C | 27.4°C | 24.3°C | 33.4°C | 20.5°C | 262 mm | 87% | 2.1 m/s | 4.4 |
| 2009 | 31.6°C | 28.0°C | 24.4°C | 33.7°C | 22.0°C | 202 mm | 84% | 1.6 m/s | 4.7 |
| 2008 | 30.6°C | 27.2°C | 23.9°C | 32.8°C | 20.9°C | 206 mm | 87% | 1.7 m/s | 5.3 |
| 2007 | 30.8°C | 27.4°C | 24.1°C | 33.8°C | 21.5°C | 225 mm | 86% | 2.1 m/s | 4.4 |
| 2006 | 32.9°C | 28.6°C | 24.4°C | 34.8°C | 22.3°C | 95 mm | 77% | 1.7 m/s | 5.1 |
| 2005 | 31.0°C | 27.8°C | 24.6°C | 33.7°C | 22.2°C | 128 mm | 86% | 2.3 m/s | 4.7 |
| 2004 | 33.8°C | 29.0°C | 24.2°C | 38.5°C | 22.3°C | 114 mm | 72% | 1.7 m/s | 5 |
| 2003 | 32.3°C | 28.7°C | 25.2°C | 35.0°C | 22.8°C | 211 mm | 80% | 1.8 m/s | 3.9 |
| 2002 | 33.4°C | 28.8°C | 24.2°C | 37.7°C | 22.1°C | 178 mm | 72% | 2.1 m/s | 4.5 |
| 2001 | 32.9°C | 28.4°C | 23.8°C | 35.6°C | 20.4°C | 127 mm | 77% | 1.4 m/s | 4.8 |
| 2000 | 31.0°C | 27.3°C | 23.6°C | 32.7°C | 20.6°C | 144 mm | 84% | 1.6 m/s | 4.3 |
| 1999 | 32.2°C | 28.5°C | 24.9°C | 34.3°C | 23.4°C | 124 mm | 80% | 2 m/s | 4.4 |
| 1998 | 31.6°C | 28.1°C | 24.6°C | 33.5°C | 22.9°C | 81 mm | 86% | 2.1 m/s | 5 |
| 1997 | 32.8°C | 28.3°C | 23.7°C | 35.1°C | 20.0°C | 175 mm | 76% | 1.7 m/s | 4.5 |
| 1996 | 31.9°C | 28.3°C | 24.7°C | 33.9°C | 22.7°C | 100 mm | 82% | 1.5 m/s | 5.1 |
| 1995 | 32.1°C | 28.2°C | 24.3°C | 35.3°C | 22.1°C | 115 mm | 80% | 2.1 m/s | 4.8 |
| 1994 | 32.3°C | 27.6°C | 22.9°C | 34.2°C | 16.2°C | 126 mm | 77% | 2.2 m/s | 4.9 |
| 1993 | 30.6°C | 27.3°C | 24.0°C | 33.8°C | 22.2°C | 195 mm | 85% | 2.6 m/s | 4.1 |
| 1992 | 32.8°C | 28.3°C | 23.8°C | 34.8°C | 21.0°C | 137 mm | 76% | 1.8 m/s | 5.1 |
| 1991 | 31.5°C | 27.6°C | 23.8°C | 32.8°C | 19.7°C | 244 mm | 84% | 1.5 m/s | 4.7 |
| 1990 | 30.9°C | 27.6°C | 24.4°C | 34.0°C | 22.5°C | 161 mm | 87% | 2.3 m/s | 4.5 |
| 1989 | 32.7°C | 28.8°C | 24.9°C | 37.3°C | 22.6°C | 163 mm | 78% | 1.9 m/s | 4.7 |
| 1988 | 31.8°C | 28.3°C | 24.8°C | 33.8°C | 22.8°C | 67 mm | 84% | 1.9 m/s | 5.2 |
| 1987 | 32.1°C | 28.1°C | 24.2°C | 35.8°C | 18.9°C | 218 mm | 81% | 1.8 m/s | 4.6 |
| 1986 | 34.5°C | 29.1°C | 23.7°C | 38.4°C | 20.8°C | 71 mm | 65% | 2.4 m/s | 5.2 |
| 1985 | 31.4°C | 27.9°C | 24.3°C | 37.0°C | 22.3°C | 346 mm | 83% | 2.4 m/s | 4.9 |
| 1984 | 31.0°C | 26.9°C | 22.9°C | 32.7°C | 17.9°C | 173 mm | 83% | 2.2 m/s | 5.1 |
| 1983 | 32.8°C | 29.0°C | 25.2°C | 35.4°C | 23.8°C | 184 mm | 78% | 2.2 m/s | — |
| 1982 ❄️ | 31.1°C | 26.9°C | 22.7°C | 35.2°C | 18.0°C | 189 mm | 84% | 1.9 m/s | — |
| 1981 | 30.6°C | 27.3°C | 24.0°C | 34.0°C | 22.4°C | 216 mm | 86% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 31.9°C with lows near 24.3°C (mean 28.1°C), based on 45 years of NASA POWER data.
September averages 174 mm of rainfall in Basti, a relatively wet time of year. The wettest on record was 357 mm in 2012.
The hottest September reached 38.5°C in 2004. The coldest dipped to 16.2°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.7°C. Daytime highs moved from 31.4°C to 31.4°C and overnight lows from 23.8°C to 25.2°C over the same span.
September is one of the warmer months of the year in Basti and a relatively wet time of year, so plan for around 31.9°C daytime highs and 24.3°C at night.
Not quite — September is the 7th coolest month in Basti, averaging 28.1°C.
For September in Basti, pack light, breathable clothing and sun protection, with typical highs of 31.9°C and lows of 24.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 82% — quite humid.
Average wind speed in September is 1.9 m/s. The windiest September on record averaged 2.6 m/s (1993).
The wettest September on record was 2012 with 357 mm. On average, September sees 174 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 Basti 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.
