September is one of the warmer months of the year in Niwari, with average highs near 31.2°C and lows around 23.1°C (mean 27.2°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 were 1984, 1992 and 2018 at 26°C. Typical September days reach 31.2°C with nights near 23.1°C. The long-term September temperature trend is broadly flat.
September is a relatively wet time of year in Niwari, averaging 140 mm of rainfall. The wettest September on record was 1993 with 344 mm, while the driest was 2001 at 20 mm.
Relative humidity in Niwari during September averages 81%. The most humid September was 2019 at 89%, and the least humid was 2000 at 63%.
September receives about 4.9 kWh/m²/day of solar energy in Niwari. The sunniest September was 2001 at 5.9 kWh/m²/day, and the cloudiest was 2003 at 3.1.
Average wind speed in Niwari during September is 2 m/s. The windiest September was 2018 at 2.7 m/s, while the calmest was 1999 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.2°C | 26.8°C | 27.4°C | 27.0°C | 27.4°C | +0.2°C |
| Avg High | 31.6°C | 30.7°C | 31.9°C | 30.9°C | 30.8°C | -0.8°C |
| Avg Low | 22.9°C | 22.8°C | 23.0°C | 23.1°C | 24.0°C | +1.1°C |
| Avg Rain | 119 mm | 175 mm | 111 mm | 128 mm | 181 mm | +62 mm |
September temperatures in Niwari have risen by about 0.6°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 0.1°C per decade while lows rose 0.2°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 31.2°C and nights around 23.1°C (mean 27.2°C, close to Niwari'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 | 30.4°C | 27.1°C | 23.8°C | 32.0°C | 21.8°C | 138 mm | 86% | 1.8 m/s | 4.6 |
| 2024 | 30.0°C | 27.1°C | 24.1°C | 32.4°C | 22.2°C | 296 mm | 88% | 1.9 m/s | 4.3 |
| 2023 | 31.0°C | 27.4°C | 23.9°C | 33.3°C | 20.8°C | 191 mm | 83% | 1.8 m/s | 4.6 |
| 2022 | 30.5°C | 27.2°C | 23.8°C | 32.4°C | 22.3°C | 271 mm | 85% | 1.8 m/s | 4.4 |
| 2021 | 30.4°C | 27.3°C | 24.2°C | 32.3°C | 23.0°C | 148 mm | 87% | 2.2 m/s | 4.6 |
| 2020 | 32.6°C | 28.3°C | 24.0°C | 34.9°C | 21.6°C | 41 mm | 78% | 1.8 m/s | 4.7 |
| 2019 | 29.7°C | 27.1°C | 24.5°C | 32.4°C | 22.2°C | 248 mm | 89% | 1.7 m/s | 3.8 |
| 2018 | 29.8°C | 26.0°C | 22.2°C | 32.2°C | 19.9°C | 194 mm | 85% | 2.7 m/s | 4.5 |
| 2017 | 33.5°C | 28.6°C | 23.7°C | 37.1°C | 21.0°C | 122 mm | 71% | 1.7 m/s | 5.1 |
| 2016 | 30.6°C | 27.0°C | 23.4°C | 32.3°C | 21.9°C | 23 mm | 84% | 1.7 m/s | 5 |
| 2015 | 31.7°C | 27.0°C | 22.2°C | 33.6°C | 18.3°C | 69 mm | 76% | 2.1 m/s | 5.7 |
| 2014 | 31.1°C | 26.8°C | 22.5°C | 32.5°C | 19.7°C | 140 mm | 82% | 2.3 m/s | 5.3 |
| 2013 | 30.9°C | 27.1°C | 23.2°C | 32.0°C | 21.2°C | 31 mm | 82% | 1.7 m/s | 5.3 |
| 2012 | 30.8°C | 26.8°C | 22.8°C | 33.2°C | 18.8°C | 115 mm | 82% | 1.9 m/s | 4.8 |
| 2011 | 30.1°C | 26.6°C | 23.2°C | 31.6°C | 19.8°C | 174 mm | 87% | 2.1 m/s | 4.9 |
| 2010 | 30.5°C | 26.8°C | 23.1°C | 32.2°C | 18.5°C | 161 mm | 82% | 1.8 m/s | 4.9 |
| 2009 | 32.8°C | 27.9°C | 22.9°C | 36.3°C | 20.6°C | 132 mm | 76% | 2.1 m/s | 5.2 |
| 2008 | 30.8°C | 26.8°C | 22.9°C | 33.6°C | 19.7°C | 152 mm | 83% | 1.9 m/s | 5.5 |
| 2007 | 31.3°C | 27.4°C | 23.4°C | 33.0°C | 20.1°C | 126 mm | 80% | 1.7 m/s | 4.9 |
| 2006 | 31.7°C | 27.4°C | 23.0°C | 33.3°C | 19.2°C | 99 mm | 78% | 1.7 m/s | 5.6 |
| 2005 | 30.9°C | 27.2°C | 23.5°C | 34.5°C | 20.8°C | 132 mm | 83% | 2.4 m/s | 4.7 |
| 2004 | 31.8°C | 27.4°C | 23.0°C | 34.0°C | 21.2°C | 56 mm | 77% | 1.7 m/s | 5.5 |
| 2003 | 29.3°C | 26.5°C | 23.6°C | 31.7°C | 22.0°C | 250 mm | 88% | 1.8 m/s | 3.1 |
| 2002 | 31.2°C | 26.4°C | 21.7°C | 33.7°C | 18.7°C | 97 mm | 78% | 2 m/s | 5.2 |
| 2001 | 32.8°C | 27.4°C | 22.1°C | 34.1°C | 19.7°C | 20 mm | 73% | 1.8 m/s | 5.9 |
| 2000 🔥 | 35.9°C | 29.7°C | 23.5°C | 38.7°C | 20.6°C | 43 mm | 63% | 2.2 m/s | 5.2 |
| 1999 | 30.3°C | 26.9°C | 23.5°C | 32.8°C | 21.5°C | 203 mm | 85% | 1.6 m/s | 4.1 |
| 1998 | 31.6°C | 27.8°C | 24.1°C | 33.1°C | 23.2°C | 127 mm | 82% | 2 m/s | 5.2 |
| 1997 | 31.3°C | 27.0°C | 22.8°C | 33.5°C | 19.8°C | 125 mm | 80% | 2.1 m/s | 4.7 |
| 1996 | 30.8°C | 26.8°C | 22.8°C | 34.0°C | 19.5°C | 137 mm | 82% | 1.7 m/s | 5.1 |
| 1995 | 30.8°C | 26.7°C | 22.5°C | 33.0°C | 19.4°C | 253 mm | 83% | 2.2 m/s | 5.3 |
| 1994 | 30.7°C | 26.1°C | 21.5°C | 31.3°C | 16.8°C | 77 mm | 79% | 2.3 m/s | 5.2 |
| 1993 🌧️ | 30.5°C | 27.0°C | 23.4°C | 34.0°C | 21.3°C | 344 mm | 84% | 2.3 m/s | 3.6 |
| 1992 | 30.3°C | 26.0°C | 21.7°C | 32.4°C | 18.2°C | 131 mm | 80% | 1.9 m/s | 4.9 |
| 1991 | 31.3°C | 26.7°C | 22.1°C | 32.8°C | 19.2°C | 21 mm | 78% | 2.1 m/s | 5 |
| 1990 | 29.7°C | 26.7°C | 23.8°C | 31.7°C | 22.3°C | 336 mm | 87% | 2.2 m/s | 3.8 |
| 1989 | 32.2°C | 27.7°C | 23.3°C | 34.4°C | 21.1°C | 98 mm | 76% | 1.9 m/s | 5.3 |
| 1988 | 33.8°C | 29.0°C | 24.2°C | 37.4°C | 21.2°C | 70 mm | 74% | 2.2 m/s | 5.5 |
| 1987 | 32.6°C | 27.8°C | 23.0°C | 35.0°C | 19.5°C | 114 mm | 75% | 2.2 m/s | 4.6 |
| 1986 | 32.1°C | 27.2°C | 22.3°C | 34.4°C | 20.7°C | 45 mm | 74% | 1.9 m/s | 5.8 |
| 1985 | 30.5°C | 26.4°C | 22.3°C | 32.8°C | 19.5°C | 166 mm | 82% | 2.4 m/s | 5 |
| 1984 ❄️ | 30.1°C | 26.0°C | 21.9°C | 32.1°C | 19.5°C | 150 mm | 80% | 2 m/s | 5.5 |
| 1983 | 30.5°C | 27.2°C | 23.9°C | 33.2°C | 20.3°C | 280 mm | 85% | 1.8 m/s | — |
| 1982 | 30.4°C | 26.1°C | 21.7°C | 33.6°C | 16.4°C | 66 mm | 82% | 2.3 m/s | — |
| 1981 | 31.9°C | 27.5°C | 23.2°C | 33.8°C | 21.7°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 31.2°C with lows near 23.1°C (mean 27.2°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 0.6°C — but days and nights have moved in opposite directions. Overnight lows rose from 22.6°C to 24°C while daytime highs eased from 30.7°C to 30.5°C, narrowing the gap between day and night.
September is one of the warmer months of the year in Niwari and a relatively wet time of year, so plan for around 31.2°C daytime highs and 23.1°C at night.
Not quite — September is the 7th coolest month in Niwari, averaging 27.2°C.
For September in Niwari, pack light, breathable clothing and sun protection, with typical highs of 31.2°C and lows of 23.1°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.
