September is one of the warmer months of the year in Adelaide River, with average highs near 38.2°C and lows around 23°C (mean 30.6°C). It is one of the drier months, averaging 17 mm of rainfall and 46% relative humidity across the period.
September is one of the warmer months of the year in Adelaide River. Across 45 years of records, the warmest September in Adelaide River was 2022 — when the month averaged 32°C — while the coldest were 1982, 1990 and 2006 at 29.1°C. Typical September days reach 38.2°C with nights near 23°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Adelaide River, averaging 17 mm of rainfall. The wettest September on record was 1981 with 78 mm, while the driest was 1990 at 0 mm.
Relative humidity in Adelaide River during September averages 46%. The most humid September was 2010 at 57%, and the least humid was 1990 at 38%.
September receives about 6.7 kWh/m²/day of solar energy in Adelaide River. The sunniest September was 1990 at 7.2 kWh/m²/day, and the cloudiest was 2016 at 5.9.
Average wind speed in Adelaide River during September is 2.3 m/s. The windiest September was 1990 at 2.9 m/s, while the calmest was 2002 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 30.5°C | 30.5°C | 30.6°C | 30.5°C | 31.1°C | +0.6°C |
| Avg High | 38.0°C | 38.2°C | 38.3°C | 38.1°C | 38.3°C | +0.3°C |
| Avg Low | 23.1°C | 22.8°C | 22.8°C | 23.0°C | 24.0°C | +0.9°C |
| Avg Rain | 28 mm | 10 mm | 13 mm | 13 mm | 25 mm | -3 mm |
September temperatures in Adelaide River have risen by about 0.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 14.2°C (2004) to a record high of 41.7°C (1986).
Rainfall in September is one of the drier months, averaging 17 mm, with a wettest year of 78 mm.
A good time to visit Adelaide River
September is a good time to visit Adelaide River, with days averaging 38.2°C and nights around 23°C (mean 30.6°C, warmer than Adelaide River's yearly average) and low rainfall. June and July 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 | 37.7°C | 30.4°C | 23.1°C | 40.1°C | 17.3°C | 45 mm | 49% | 2.4 m/s | 6.3 |
| 2024 | 38.4°C | 31.4°C | 24.5°C | 41.2°C | 22.2°C | 28 mm | 50% | 2.6 m/s | 6.3 |
| 2023 | 38.2°C | 30.5°C | 22.7°C | 41.0°C | 19.5°C | 1 mm | 43% | 2.7 m/s | 6.9 |
| 2022 🔥 | 38.7°C | 32.0°C | 25.3°C | 41.1°C | 20.9°C | 29 mm | 51% | 2.1 m/s | 6.3 |
| 2021 | 38.1°C | 31.0°C | 23.9°C | 40.2°C | 18.3°C | 22 mm | 48% | 2.6 m/s | 6.7 |
| 2020 | 38.8°C | 31.5°C | 24.3°C | 40.4°C | 21.1°C | 22 mm | 49% | 2.5 m/s | 6.6 |
| 2019 | 37.8°C | 29.4°C | 20.9°C | 40.5°C | 15.5°C | 0 mm | 45% | 2.6 m/s | 7.1 |
| 2018 | 38.7°C | 31.1°C | 23.4°C | 40.3°C | 21.1°C | 0 mm | 43% | 2.2 m/s | 6.9 |
| 2017 | 38.7°C | 31.0°C | 23.4°C | 40.0°C | 18.4°C | 4 mm | 44% | 2.4 m/s | 6.8 |
| 2016 | 37.5°C | 31.4°C | 25.3°C | 39.7°C | 23.1°C | 33 mm | 55% | 2 m/s | 5.9 |
| 2015 | 37.6°C | 29.9°C | 22.1°C | 39.5°C | 16.5°C | 1 mm | 39% | 2.3 m/s | 6.8 |
| 2014 | 38.5°C | 30.2°C | 21.9°C | 40.4°C | 17.7°C | 0 mm | 43% | 2.1 m/s | 7 |
| 2013 | 38.2°C | 30.8°C | 23.5°C | 40.4°C | 18.4°C | 7 mm | 47% | 2.4 m/s | 6.5 |
| 2012 | 38.6°C | 30.4°C | 22.3°C | 41.2°C | 18.5°C | 25 mm | 44% | 2.2 m/s | 7 |
| 2011 | 37.7°C | 29.9°C | 22.2°C | 40.1°C | 15.6°C | 1 mm | 43% | 2.4 m/s | 6.8 |
| 2010 | 37.5°C | 31.2°C | 24.8°C | 40.1°C | 23.2°C | 59 mm | 57% | 2.5 m/s | 6.1 |
| 2009 | 38.7°C | 31.5°C | 24.4°C | 40.5°C | 20.3°C | 20 mm | 48% | 2.2 m/s | 6.5 |
| 2008 | 39.1°C | 31.5°C | 23.8°C | 40.6°C | 20.3°C | 12 mm | 44% | 2.2 m/s | 6.7 |
| 2007 | 38.5°C | 30.1°C | 21.7°C | 41.3°C | 15.0°C | 19 mm | 44% | 2.2 m/s | 7 |
| 2006 | 37.6°C | 29.1°C | 20.6°C | 40.7°C | 14.5°C | 2 mm | 40% | 2.6 m/s | 7 |
| 2005 | 38.6°C | 31.3°C | 24.0°C | 40.3°C | 20.5°C | 12 mm | 48% | 2.1 m/s | 6.3 |
| 2004 | 37.5°C | 29.2°C | 20.9°C | 39.7°C | 14.2°C | 5 mm | 40% | 2.7 m/s | 7 |
| 2003 | 38.5°C | 31.2°C | 23.8°C | 41.0°C | 15.6°C | 7 mm | 45% | 2.3 m/s | 6.3 |
| 2002 | 37.1°C | 29.8°C | 22.4°C | 39.9°C | 19.8°C | 40 mm | 55% | 1.9 m/s | 6.2 |
| 2001 | 38.9°C | 30.9°C | 22.9°C | 41.2°C | 17.8°C | 5 mm | 47% | 2.2 m/s | 6.6 |
| 2000 | 38.8°C | 31.1°C | 23.4°C | 40.3°C | 18.3°C | 5 mm | 45% | 2.3 m/s | 6.7 |
| 1999 | 38.2°C | 30.2°C | 22.1°C | 40.1°C | 17.8°C | 2 mm | 46% | 2.3 m/s | 6.9 |
| 1998 | 38.4°C | 31.3°C | 24.1°C | 40.7°C | 19.2°C | 33 mm | 51% | 2.2 m/s | 6.2 |
| 1997 | 38.4°C | 30.2°C | 22.1°C | 41.1°C | 20.1°C | 6 mm | 47% | 2.4 m/s | 7 |
| 1996 | 38.1°C | 30.1°C | 22.0°C | 40.1°C | 16.5°C | 4 mm | 46% | 2.4 m/s | 6.9 |
| 1995 | 39.0°C | 31.5°C | 24.0°C | 40.7°C | 22.3°C | 5 mm | 48% | 2.3 m/s | 6.5 |
| 1994 | 37.8°C | 29.6°C | 21.4°C | 40.1°C | 17.7°C | 2 mm | 44% | 2.3 m/s | 6.7 |
| 1993 | 37.8°C | 30.5°C | 23.3°C | 39.4°C | 21.4°C | 20 mm | 50% | 2.4 m/s | 6.4 |
| 1992 | 38.7°C | 31.8°C | 24.9°C | 41.1°C | 22.7°C | 22 mm | 52% | 2.3 m/s | 6.3 |
| 1991 | 38.5°C | 30.8°C | 23.1°C | 40.1°C | 21.3°C | 9 mm | 47% | 2.1 m/s | 6.6 |
| 1990 | 37.6°C | 29.1°C | 20.6°C | 39.4°C | 15.0°C | 0 mm | 38% | 2.9 m/s | 7.2 |
| 1989 | 39.3°C | 31.1°C | 22.8°C | 41.7°C | 17.2°C | 2 mm | 42% | 2.3 m/s | 7 |
| 1988 | 38.8°C | 31.4°C | 24.1°C | 40.8°C | 16.3°C | 32 mm | 48% | 2.3 m/s | 6.7 |
| 1987 | 38.2°C | 30.5°C | 22.8°C | 39.9°C | 17.7°C | 12 mm | 43% | 2.3 m/s | 6.6 |
| 1986 | 38.1°C | 30.8°C | 23.4°C | 41.7°C | 15.4°C | 39 mm | 47% | 2.5 m/s | 6.7 |
| 1985 | 38.2°C | 30.3°C | 22.3°C | 40.4°C | 16.3°C | 7 mm | 40% | 2.3 m/s | 7.1 |
| 1984 | 36.2°C | 29.4°C | 22.6°C | 39.1°C | 15.0°C | 62 mm | 54% | 2 m/s | 6.3 |
| 1983 | 39.0°C | 31.4°C | 23.8°C | 41.5°C | 18.6°C | 14 mm | 46% | 2.2 m/s | — |
| 1982 ❄️ | 36.7°C | 29.1°C | 21.6°C | 40.8°C | 17.4°C | 7 mm | 46% | 2.2 m/s | — |
| 1981 🌧️ | 37.3°C | 30.7°C | 24.1°C | 39.8°C | 21.0°C | 78 mm | 49% | 2.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 38.2°C with lows near 23°C (mean 30.6°C), based on 45 years of NASA POWER data.
September averages 17 mm of rainfall in Adelaide River, one of the drier months. The wettest on record was 78 mm in 1981.
The hottest September reached 41.7°C in 1986. The coldest dipped to 14.2°C in 2004.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.9°C. Daytime highs moved from 37.5°C to 38.2°C and overnight lows from 22.9°C to 23.9°C over the same span.
September is one of the warmer months of the year in Adelaide River and one of the drier months, so plan for around 38.2°C daytime highs and 23°C at night.
Not quite — September is the 10th coolest month in Adelaide River, averaging 30.6°C.
For September in Adelaide River, pack light, breathable clothing and sun protection, with typical highs of 38.2°C and lows of 23°C.
Relative humidity in September averages 46% — relatively dry.
Average wind speed in September is 2.3 m/s. The windiest September on record averaged 2.9 m/s (1990).
The wettest September on record was 1981 with 78 mm. On average, September sees 17 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 Adelaide River 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.
