September is one of the warmer months of the year in Darwin, with average highs near 32.6°C and lows around 25.8°C (mean 29.2°C). It is one of the drier months, averaging 19 mm of rainfall and 60% relative humidity across the period.
September is one of the warmer months of the year in Darwin. Across 45 years of records, the warmest September in Darwin was 2024 — when the month averaged 30.3°C — while the coldest was 2006 at 28.1°C. Typical September days reach 32.6°C with nights near 25.8°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Darwin, averaging 19 mm of rainfall. The wettest September on record was 1981 with 73 mm, while the driest was 2014 at 1 mm.
Relative humidity in Darwin during September averages 60%. The most humid September was 2016 at 67%, and the least humid was 1990 at 52%.
September receives about 6.4 kWh/m²/day of solar energy in Darwin. The sunniest September was 2019 at 6.9 kWh/m²/day, and the cloudiest was 2010 at 5.8.
Average wind speed in Darwin during September is 3.1 m/s. The windiest September was 1981 at 3.8 m/s, while the calmest was 2012 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 29.2°C | 29.0°C | 29.1°C | 29.2°C | 29.7°C | +0.5°C |
| Avg High | 32.6°C | 32.4°C | 32.6°C | 32.5°C | 33.0°C | +0.4°C |
| Avg Low | 25.9°C | 25.7°C | 25.7°C | 25.8°C | 26.4°C | +0.5°C |
| Avg Rain | 27 mm | 12 mm | 15 mm | 16 mm | 28 mm | +2 mm |
September temperatures in Darwin have risen by about 0.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 18.7°C (2004) to a record high of 36°C (1983).
Rainfall in September is one of the drier months, averaging 19 mm, with a wettest year of 73 mm.
A good time to visit Darwin
September is a good time to visit Darwin, with days averaging 32.6°C and nights around 25.8°C (mean 29.2°C, close to Darwin'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 | 32.5°C | 29.1°C | 25.7°C | 33.8°C | 22.0°C | 51 mm | 60% | 3.2 m/s | 6.2 |
| 2024 🔥 | 33.7°C | 30.3°C | 26.9°C | 35.8°C | 24.8°C | 25 mm | 61% | 3.6 m/s | 6.2 |
| 2023 | 33.1°C | 29.5°C | 25.9°C | 35.4°C | 24.5°C | 1 mm | 56% | 3.4 m/s | 6.6 |
| 2022 | 32.4°C | 29.7°C | 27.0°C | 35.0°C | 25.1°C | 41 mm | 67% | 2.8 m/s | 6.2 |
| 2021 | 32.9°C | 29.6°C | 26.2°C | 34.8°C | 22.3°C | 22 mm | 60% | 3.5 m/s | 6.6 |
| 2020 | 33.4°C | 30.1°C | 26.7°C | 34.5°C | 25.3°C | 30 mm | 61% | 3.3 m/s | 6.5 |
| 2019 | 32.2°C | 28.3°C | 24.4°C | 33.7°C | 20.4°C | 2 mm | 58% | 3.3 m/s | 6.9 |
| 2018 | 33.0°C | 29.6°C | 26.3°C | 35.0°C | 24.9°C | 2 mm | 60% | 3.1 m/s | 6.7 |
| 2017 | 33.0°C | 29.6°C | 26.1°C | 34.7°C | 22.9°C | 10 mm | 60% | 2.9 m/s | 6.6 |
| 2016 | 32.1°C | 29.7°C | 27.3°C | 34.0°C | 26.0°C | 44 mm | 67% | 2.7 m/s | 6.1 |
| 2015 | 32.3°C | 28.9°C | 25.5°C | 34.0°C | 22.2°C | 2 mm | 57% | 2.9 m/s | 6.5 |
| 2014 | 32.6°C | 29.0°C | 25.3°C | 34.9°C | 22.8°C | 1 mm | 58% | 2.7 m/s | 6.6 |
| 2013 | 32.3°C | 29.1°C | 25.9°C | 34.5°C | 22.6°C | 9 mm | 62% | 3.6 m/s | 6.3 |
| 2012 | 32.7°C | 29.2°C | 25.6°C | 34.0°C | 22.9°C | 23 mm | 60% | 2.5 m/s | 6.5 |
| 2011 | 32.1°C | 28.4°C | 24.7°C | 33.5°C | 20.1°C | 3 mm | 59% | 3.1 m/s | 6.4 |
| 2010 | 33.0°C | 30.0°C | 27.1°C | 34.5°C | 25.8°C | 62 mm | 64% | 3.3 m/s | 5.8 |
| 2009 | 33.0°C | 29.9°C | 26.9°C | 34.6°C | 25.8°C | 24 mm | 61% | 3.1 m/s | 6.3 |
| 2008 | 33.1°C | 29.6°C | 26.2°C | 34.7°C | 25.2°C | 17 mm | 61% | 2.7 m/s | 6.4 |
| 2007 | 33.1°C | 29.2°C | 25.3°C | 34.9°C | 21.6°C | 20 mm | 58% | 2.7 m/s | 6.5 |
| 2006 ❄️ | 32.1°C | 28.1°C | 24.2°C | 34.1°C | 19.7°C | 6 mm | 56% | 3.4 m/s | 6.7 |
| 2005 | 32.5°C | 29.5°C | 26.4°C | 34.7°C | 24.4°C | 14 mm | 61% | 3.2 m/s | 6.2 |
| 2004 | 32.5°C | 28.5°C | 24.4°C | 34.4°C | 18.7°C | 9 mm | 54% | 3.5 m/s | 6.6 |
| 2003 | 32.4°C | 29.2°C | 26.1°C | 34.4°C | 20.7°C | 11 mm | 60% | 3.2 m/s | 6.2 |
| 2002 | 31.2°C | 28.3°C | 25.3°C | 34.4°C | 23.4°C | 38 mm | 65% | 2.7 m/s | 6.3 |
| 2001 | 32.9°C | 29.4°C | 25.9°C | 35.6°C | 23.8°C | 8 mm | 61% | 2.9 m/s | 6.6 |
| 2000 | 33.0°C | 29.5°C | 26.0°C | 34.7°C | 22.6°C | 8 mm | 60% | 3 m/s | 6.3 |
| 1999 | 32.6°C | 28.9°C | 25.3°C | 34.2°C | 23.0°C | 3 mm | 59% | 3.1 m/s | 6.6 |
| 1998 | 32.8°C | 29.7°C | 26.6°C | 34.8°C | 24.3°C | 29 mm | 64% | 2.9 m/s | 6.2 |
| 1997 | 32.4°C | 28.8°C | 25.2°C | 34.7°C | 23.9°C | 8 mm | 60% | 3.4 m/s | 6.7 |
| 1996 | 32.1°C | 28.9°C | 25.6°C | 34.5°C | 21.8°C | 7 mm | 60% | 3.5 m/s | 6.4 |
| 1995 | 32.5°C | 29.3°C | 26.1°C | 34.9°C | 25.0°C | 8 mm | 63% | 3.1 m/s | 6.3 |
| 1994 | 32.1°C | 28.5°C | 25.0°C | 34.2°C | 23.7°C | 5 mm | 58% | 2.7 m/s | 6.4 |
| 1993 | 32.1°C | 29.0°C | 25.8°C | 33.8°C | 25.0°C | 25 mm | 61% | 3.7 m/s | 6.2 |
| 1992 | 32.3°C | 29.6°C | 26.9°C | 34.5°C | 25.6°C | 22 mm | 65% | 3.3 m/s | 6 |
| 1991 | 31.8°C | 28.7°C | 25.5°C | 33.4°C | 24.6°C | 10 mm | 63% | 3 m/s | 5.9 |
| 1990 | 32.9°C | 28.7°C | 24.6°C | 34.5°C | 21.1°C | 2 mm | 52% | 3.6 m/s | 6.4 |
| 1989 | 33.2°C | 29.4°C | 25.7°C | 35.1°C | 21.7°C | 5 mm | 59% | 2.8 m/s | 6.4 |
| 1988 | 33.5°C | 30.1°C | 26.8°C | 35.3°C | 23.1°C | 32 mm | 59% | 3 m/s | 6.3 |
| 1987 | 32.6°C | 29.1°C | 25.7°C | 35.0°C | 22.8°C | 16 mm | 58% | 3.1 m/s | 6.2 |
| 1986 | 32.1°C | 28.9°C | 25.7°C | 35.7°C | 19.7°C | 27 mm | 62% | 3.5 m/s | 6.1 |
| 1985 | 32.8°C | 29.3°C | 25.8°C | 35.2°C | 23.4°C | 14 mm | 56% | 2.9 m/s | 6.4 |
| 1984 | 31.6°C | 28.6°C | 25.7°C | 34.2°C | 20.4°C | 53 mm | 62% | 2.7 m/s | 6 |
| 1983 | 33.1°C | 29.8°C | 26.4°C | 36.0°C | 24.1°C | 11 mm | 60% | 2.9 m/s | — |
| 1982 | 31.4°C | 28.2°C | 25.0°C | 35.6°C | 24.0°C | 9 mm | 59% | 3.1 m/s | — |
| 1981 🌧️ | 32.7°C | 29.6°C | 26.5°C | 35.2°C | 24.2°C | 73 mm | 60% | 3.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 32.6°C with lows near 25.8°C (mean 29.2°C), based on 45 years of NASA POWER data.
September averages 19 mm of rainfall in Darwin, one of the drier months. The wettest on record was 73 mm in 1981.
The hottest September reached 36°C in 1983. The coldest dipped to 18.7°C in 2004.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.5°C. Daytime highs moved from 32.3°C to 32.9°C and overnight lows from 25.9°C to 26.3°C over the same span.
September is one of the warmer months of the year in Darwin and one of the drier months, so plan for around 32.6°C daytime highs and 25.8°C at night.
Not quite — September is the 9th coolest month in Darwin, averaging 29.2°C.
For September in Darwin, pack light, breathable clothing and sun protection, with typical highs of 32.6°C and lows of 25.8°C.
Relative humidity in September averages 60% — moderately humid.
Average wind speed in September is 3.1 m/s. The windiest September on record averaged 3.8 m/s (1981).
The wettest September on record was 1981 with 73 mm. On average, September sees 19 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 Darwin 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.
