September is one of the warmer months of the year in Banka, with average highs near 33.3°C and lows around 22.7°C (mean 28°C). It is a relatively wet time of year, averaging 189 mm of rainfall and 86% relative humidity across the period.
September is one of the warmer months of the year in Banka. Across 45 years of records, the warmest September in Banka was 1989 — when the month averaged 30.3°C — while the coldest was 1984 at 24.9°C. Typical September days reach 33.3°C with nights near 22.7°C. The long-term September temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.9°C | 27.8°C | 27.9°C | 28.0°C | 28.5°C | +0.6°C |
| Avg High | 33.7°C | 33.4°C | 32.8°C | 33.4°C | 33.1°C | -0.6°C |
| Avg Low | 22.1°C | 22.3°C | 22.9°C | 22.7°C | 23.9°C | +1.8°C |
| Avg Rain | 165 mm | 152 mm | 200 mm | 192 mm | 264 mm | +99 mm |
September temperatures in Banka have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 18.6°C (1984) to a record high of 37.9°C (1992).
Rainfall in September is a relatively wet time of year, averaging 189 mm, with a wettest year of 403 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Banka
September is a good time to visit Banka, with days averaging 33.3°C and nights around 22.7°C (mean 28°C, warmer than Banka'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 | 32.5°C | 24.4°C | 28.5°C | 155 mm | 87% | 1.5 m/s | 4.4 |
| 2024 | 33.6°C | 24.0°C | 28.8°C | 323 mm | 89% | 2.2 m/s | 4.4 |
| 2023 | 33.2°C | 24.2°C | 28.7°C | 374 mm | 89% | 1.9 m/s | 4.1 |
| 2022 | 32.9°C | 23.8°C | 28.3°C | 223 mm | 87% | 1.7 m/s | 4 |
| 2021 | 33.0°C | 23.6°C | 28.3°C | 130 mm | 88% | 2 m/s | 4.3 |
| 2020 | 33.3°C | 23.5°C | 28.4°C | 380 mm | 88% | 1.5 m/s | 4 |
| 2019 🌧️ | 33.5°C | 22.9°C | 28.2°C | 403 mm | 88% | 2 m/s | 3.9 |
| 2018 | 32.6°C | 23.0°C | 27.8°C | 115 mm | 85% | 1.9 m/s | 4.6 |
| 2017 | 33.4°C | 24.2°C | 28.8°C | 158 mm | 87% | 1.6 m/s | 4.6 |
| 2016 | 32.7°C | 24.2°C | 28.4°C | 338 mm | 88% | 1.6 m/s | 4.2 |
| 2015 | 33.9°C | 21.9°C | 27.9°C | 178 mm | 83% | 1.7 m/s | 5.1 |
| 2014 | 33.4°C | 22.1°C | 27.8°C | 122 mm | 85% | 1.7 m/s | 4.7 |
| 2013 | 34.7°C | 23.6°C | 29.2°C | 98 mm | 80% | 1.8 m/s | 4.7 |
| 2012 | 33.3°C | 20.5°C | 26.9°C | 143 mm | 86% | 1.9 m/s | 4.5 |
| 2011 | 32.8°C | 22.2°C | 27.5°C | 205 mm | 89% | 2.6 m/s | 4.2 |
| 2010 | 33.2°C | 22.1°C | 27.7°C | 161 mm | 86% | 1.9 m/s | 4.6 |
| 2009 | 32.8°C | 23.6°C | 28.2°C | 164 mm | 87% | 1.8 m/s | 4.7 |
| 2008 | 33.0°C | 21.8°C | 27.4°C | 162 mm | 86% | 1.7 m/s | 4.7 |
| 2007 | 31.9°C | 23.4°C | 27.6°C | 285 mm | 89% | 2.1 m/s | 4.5 |
| 2006 | 33.0°C | 23.6°C | 28.3°C | 347 mm | 87% | 2.2 m/s | 4.4 |
| 2005 | 33.0°C | 23.6°C | 28.3°C | 114 mm | 86% | 1.9 m/s | 4.8 |
| 2004 | 33.2°C | 22.8°C | 28.0°C | 117 mm | 87% | 2.1 m/s | 4.3 |
| 2003 | 33.6°C | 23.9°C | 28.8°C | 149 mm | 84% | 2.2 m/s | 4.4 |
| 2002 | 32.3°C | 22.4°C | 27.3°C | 223 mm | 86% | 2.1 m/s | 4.5 |
| 2001 | 32.4°C | 23.2°C | 27.8°C | 195 mm | 86% | 1.5 m/s | 4.5 |
| 2000 | 32.5°C | 21.1°C | 26.8°C | 242 mm | 88% | 2.3 m/s | 4 |
| 1999 | 31.6°C | 22.8°C | 27.2°C | 114 mm | 90% | 2.5 m/s | 4.3 |
| 1998 | 32.9°C | 23.9°C | 28.4°C | 212 mm | 88% | 1.9 m/s | 4.4 |
| 1997 | 31.8°C | 20.0°C | 25.9°C | 135 mm | 87% | 1.7 m/s | 4.6 |
| 1996 | 33.2°C | 23.6°C | 28.4°C | 100 mm | 83% | 1.5 m/s | 4.7 |
| 1995 | 32.5°C | 22.7°C | 27.6°C | 177 mm | 87% | 2.4 m/s | 4.2 |
| 1994 | 33.5°C | 18.8°C | 26.1°C | 100 mm | 79% | 2.3 m/s | 4.7 |
| 1993 | 33.7°C | 23.2°C | 28.5°C | 229 mm | 85% | 2.2 m/s | 4 |
| 1992 | 37.9°C | 21.9°C | 29.9°C | 61 mm | 73% | 2.3 m/s | 5.1 |
| 1991 | 32.8°C | 22.3°C | 27.5°C | 235 mm | 88% | 1.8 m/s | 4.2 |
| 1990 | 34.3°C | 23.4°C | 28.8°C | 161 mm | 86% | 1.9 m/s | 4.4 |
| 1989 🔥 | 36.6°C | 24.1°C | 30.3°C | 164 mm | 80% | 2.2 m/s | 4.5 |
| 1988 | 33.6°C | 22.8°C | 28.2°C | 104 mm | 85% | 1.6 m/s | 5 |
| 1987 | 32.9°C | 22.2°C | 27.5°C | 273 mm | 88% | 1.9 m/s | 4.5 |
| 1986 | 34.6°C | 21.9°C | 28.3°C | 140 mm | 80% | 2.5 m/s | 4.5 |
| 1985 | 33.2°C | 22.3°C | 27.7°C | 204 mm | 85% | 1.7 m/s | 5 |
| 1984 ❄️ | 31.3°C | 18.6°C | 24.9°C | 187 mm | 86% | 1.8 m/s | 4.8 |
| 1983 | 35.2°C | 23.9°C | 29.5°C | 99 mm | 79% | 2.2 m/s | — |
| 1982 | 33.6°C | 19.9°C | 26.8°C | 119 mm | 82% | 1.9 m/s | — |
| 1981 | 32.6°C | 22.9°C | 27.8°C | 199 mm | 88% | 1.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.3°C with lows near 22.7°C (mean 28°C), based on 45 years of NASA POWER data.
September averages 189 mm of rainfall in Banka, a relatively wet time of year. The wettest on record was 403 mm in 2019.
The hottest September reached 37.9°C in 1992. The coldest dipped to 18.6°C in 1984.
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 33.2°C to 33°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 Banka and a relatively wet time of year, so plan for around 33.3°C daytime highs and 22.7°C at night.
Not quite — September is the 7th coolest month in Banka, averaging 28°C.
For September in Banka, pack light, breathable clothing and sun protection, with typical highs of 33.3°C and lows of 22.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 86% — quite humid.
Average wind speed in September is 1.9 m/s. The windiest September on record averaged 2.6 m/s (2011).
The wettest September on record was 2019 with 403 mm. On average, September sees 189 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 Banka 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.
