September is one of the warmer months of the year in Niwari, with average highs near 33.4°C and lows around 20.4°C (mean 26.9°C). It is a relatively wet time of year, averaging 140 mm of rainfall and 81% relative humidity across the period.
September is one of the warmer months of the year in Niwari. Across 45 years of records, the warmest September in Niwari was 2000 — when the month averaged 29.7°C — while the coldest was 1994 at 24°C. Typical September days reach 33.4°C with nights near 20.4°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 | 27.0°C | 26.5°C | 27.3°C | 26.5°C | 27.4°C | +0.4°C |
| Avg High | 34.1°C | 32.9°C | 34.3°C | 32.9°C | 32.9°C | -1.2°C |
| Avg Low | 20.0°C | 20.1°C | 20.3°C | 20.1°C | 22.0°C | +2°C |
| Avg Rain | 119 mm | 175 mm | 111 mm | 128 mm | 181 mm | +62 mm |
September temperatures in Niwari have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 16.4°C (1982) to a record high of 38.7°C (2000).
Rainfall in September is a relatively wet time of year, averaging 140 mm, with a wettest year of 344 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 Niwari
September is a good time to visit Niwari, with days averaging 33.4°C and nights around 20.4°C (mean 26.9°C, close to Niwari'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 | 32.0°C | 21.8°C | 26.9°C | 138 mm | 86% | 1.8 m/s | 4.6 |
| 2024 | 32.4°C | 22.2°C | 27.3°C | 296 mm | 88% | 1.9 m/s | 4.3 |
| 2023 | 33.3°C | 20.8°C | 27.1°C | 191 mm | 83% | 1.8 m/s | 4.6 |
| 2022 | 32.4°C | 22.3°C | 27.4°C | 271 mm | 85% | 1.8 m/s | 4.4 |
| 2021 | 32.3°C | 23.0°C | 27.6°C | 148 mm | 87% | 2.2 m/s | 4.6 |
| 2020 | 34.9°C | 21.6°C | 28.3°C | 41 mm | 78% | 1.8 m/s | 4.7 |
| 2019 | 32.4°C | 22.2°C | 27.3°C | 248 mm | 89% | 1.7 m/s | 3.8 |
| 2018 | 32.2°C | 19.9°C | 26.1°C | 194 mm | 85% | 2.7 m/s | 4.5 |
| 2017 | 37.1°C | 21.0°C | 29.0°C | 122 mm | 71% | 1.7 m/s | 5.1 |
| 2016 | 32.3°C | 21.9°C | 27.1°C | 23 mm | 84% | 1.7 m/s | 5 |
| 2015 | 33.6°C | 18.3°C | 26.0°C | 69 mm | 76% | 2.1 m/s | 5.7 |
| 2014 | 32.5°C | 19.7°C | 26.1°C | 140 mm | 82% | 2.3 m/s | 5.3 |
| 2013 | 32.0°C | 21.2°C | 26.6°C | 31 mm | 82% | 1.7 m/s | 5.3 |
| 2012 | 33.2°C | 18.8°C | 26.0°C | 115 mm | 82% | 1.9 m/s | 4.8 |
| 2011 | 31.6°C | 19.8°C | 25.7°C | 174 mm | 87% | 2.1 m/s | 4.9 |
| 2010 | 32.2°C | 18.5°C | 25.4°C | 161 mm | 82% | 1.8 m/s | 4.9 |
| 2009 | 36.3°C | 20.6°C | 28.5°C | 132 mm | 76% | 2.1 m/s | 5.2 |
| 2008 | 33.6°C | 19.7°C | 26.6°C | 152 mm | 83% | 1.9 m/s | 5.5 |
| 2007 | 33.0°C | 20.1°C | 26.6°C | 126 mm | 80% | 1.7 m/s | 4.9 |
| 2006 | 33.3°C | 19.2°C | 26.3°C | 99 mm | 78% | 1.7 m/s | 5.6 |
| 2005 | 34.5°C | 20.8°C | 27.7°C | 132 mm | 83% | 2.4 m/s | 4.7 |
| 2004 | 34.0°C | 21.2°C | 27.6°C | 56 mm | 77% | 1.7 m/s | 5.5 |
| 2003 | 31.7°C | 22.0°C | 26.9°C | 250 mm | 88% | 1.8 m/s | 3.1 |
| 2002 | 33.7°C | 18.7°C | 26.2°C | 97 mm | 78% | 2 m/s | 5.2 |
| 2001 | 34.1°C | 19.7°C | 26.9°C | 20 mm | 73% | 1.8 m/s | 5.9 |
| 2000 🔥 | 38.7°C | 20.6°C | 29.7°C | 43 mm | 63% | 2.2 m/s | 5.2 |
| 1999 | 32.8°C | 21.5°C | 27.1°C | 203 mm | 85% | 1.6 m/s | 4.1 |
| 1998 | 33.1°C | 23.2°C | 28.2°C | 127 mm | 82% | 2 m/s | 5.2 |
| 1997 | 33.5°C | 19.8°C | 26.7°C | 125 mm | 80% | 2.1 m/s | 4.7 |
| 1996 | 34.0°C | 19.5°C | 26.7°C | 137 mm | 82% | 1.7 m/s | 5.1 |
| 1995 | 33.0°C | 19.4°C | 26.2°C | 253 mm | 83% | 2.2 m/s | 5.3 |
| 1994 ❄️ | 31.3°C | 16.8°C | 24.0°C | 77 mm | 79% | 2.3 m/s | 5.2 |
| 1993 🌧️ | 34.0°C | 21.3°C | 27.6°C | 344 mm | 84% | 2.3 m/s | 3.6 |
| 1992 | 32.4°C | 18.2°C | 25.3°C | 131 mm | 80% | 1.9 m/s | 4.9 |
| 1991 | 32.8°C | 19.2°C | 26.0°C | 21 mm | 78% | 2.1 m/s | 5 |
| 1990 | 31.7°C | 22.3°C | 27.0°C | 336 mm | 87% | 2.2 m/s | 3.8 |
| 1989 | 34.4°C | 21.1°C | 27.7°C | 98 mm | 76% | 1.9 m/s | 5.3 |
| 1988 | 37.4°C | 21.2°C | 29.3°C | 70 mm | 74% | 2.2 m/s | 5.5 |
| 1987 | 35.0°C | 19.5°C | 27.2°C | 114 mm | 75% | 2.2 m/s | 4.6 |
| 1986 | 34.4°C | 20.7°C | 27.5°C | 45 mm | 74% | 1.9 m/s | 5.8 |
| 1985 | 32.8°C | 19.5°C | 26.2°C | 166 mm | 82% | 2.4 m/s | 5 |
| 1984 | 32.1°C | 19.5°C | 25.8°C | 150 mm | 80% | 2 m/s | 5.5 |
| 1983 | 33.2°C | 20.3°C | 26.8°C | 280 mm | 85% | 1.8 m/s | — |
| 1982 | 33.6°C | 16.4°C | 25.0°C | 66 mm | 82% | 2.3 m/s | — |
| 1981 | 33.8°C | 21.7°C | 27.8°C | 79 mm | 80% | 2.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.4°C with lows near 20.4°C (mean 26.9°C), based on 45 years of NASA POWER data.
September averages 140 mm of rainfall in Niwari, a relatively wet time of year. The wettest on record was 344 mm in 1993.
The hottest September reached 38.7°C in 2000. The coldest dipped to 16.4°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1°C. Daytime highs moved from 33.1°C to 32.5°C and overnight lows from 19.5°C to 22°C over the same span.
September is one of the warmer months of the year in Niwari and a relatively wet time of year, so plan for around 33.4°C daytime highs and 20.4°C at night.
Not quite — September is the 7th coolest month in Niwari, averaging 26.9°C.
For September in Niwari, pack light, breathable clothing and sun protection, with typical highs of 33.4°C and lows of 20.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 81% — quite humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.7 m/s (2018).
The wettest September on record was 1993 with 344 mm. On average, September sees 140 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 Niwari 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.
