September is one of the cooler months of the year in Gladstone, with average highs near 26.4°C and lows around 15.4°C (mean 20.9°C). It is one of the drier months, averaging 29 mm of rainfall and 67% relative humidity across the period.
September is one of the cooler months of the year in Gladstone. Across 45 years of records, the warmest September in Gladstone was 2013 — when the month averaged 23.3°C — while the coldest was 1990 at 19.1°C. Typical September days reach 26.4°C with nights near 15.4°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Gladstone, averaging 29 mm of rainfall. The wettest September on record was 2010 with 149 mm, while the driest were 2000 and 2017 at 0 mm.
Relative humidity in Gladstone during September averages 67%. The most humid September was 1998 at 80%, and the least humid was 1991 at 55%.
September receives about 5.9 kWh/m²/day of solar energy in Gladstone. The sunniest September was 2019 at 6.4 kWh/m²/day, and the cloudiest was 2010 at 4.6.
Average wind speed in Gladstone during September is 2.7 m/s. The windiest September was 1999 at 3.3 m/s, while the calmest were 1984 and 2022 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.3°C | 20.7°C | 21.1°C | 21.2°C | 21.4°C | +1.1°C |
| Avg High | 25.8°C | 26.2°C | 26.6°C | 26.7°C | 26.6°C | +0.8°C |
| Avg Low | 14.9°C | 15.3°C | 15.5°C | 15.7°C | 16.1°C | +1.2°C |
| Avg Rain | 30 mm | 44 mm | 17 mm | 33 mm | 19 mm | -11 mm |
September temperatures in Gladstone have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7.5°C (2011) to a record high of 35.5°C (2017).
Rainfall in September is one of the drier months, averaging 29 mm, with a wettest year of 149 mm.
One of the best times to visit Gladstone
September is one of the best times to visit Gladstone. Expect days averaging 26.4°C and nights around 15.4°C (mean 20.9°C) — cooler than Gladstone's yearly average — with low rainfall (29 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 27.0°C | 21.6°C | 16.3°C | 32.3°C | 12.4°C | 16 mm | 69% | 2.7 m/s | 5.8 |
| 2024 | 27.0°C | 21.7°C | 16.4°C | 31.8°C | 14.1°C | 6 mm | 67% | 2.7 m/s | 5.8 |
| 2023 | 27.2°C | 21.9°C | 16.5°C | 33.8°C | 14.0°C | 4 mm | 65% | 3.2 m/s | 6.2 |
| 2022 | 26.3°C | 21.0°C | 15.6°C | 30.9°C | 11.1°C | 51 mm | 71% | 2.3 m/s | 5.3 |
| 2021 | 26.2°C | 20.7°C | 15.2°C | 30.1°C | 10.0°C | 19 mm | 63% | 3 m/s | 6.1 |
| 2020 | 26.1°C | 21.3°C | 16.5°C | 30.2°C | 12.6°C | 18 mm | 70% | 3.2 m/s | 5.8 |
| 2019 | 28.4°C | 21.9°C | 15.5°C | 33.3°C | 10.4°C | 0 mm | 58% | 2.5 m/s | 6.4 |
| 2018 | 26.7°C | 21.2°C | 15.7°C | 31.7°C | 12.3°C | 13 mm | 65% | 2.9 m/s | 6.2 |
| 2017 | 28.7°C | 22.4°C | 16.2°C | 35.5°C | 11.3°C | 0 mm | 62% | 2.6 m/s | 6.2 |
| 2016 | 26.5°C | 21.6°C | 16.7°C | 31.5°C | 12.5°C | 62 mm | 71% | 2.8 m/s | 5.5 |
| 2015 | 25.9°C | 20.3°C | 14.8°C | 29.6°C | 10.2°C | 12 mm | 65% | 2.7 m/s | 6.2 |
| 2014 | 25.4°C | 20.2°C | 14.9°C | 29.4°C | 8.3°C | 60 mm | 69% | 2.7 m/s | 5.8 |
| 2013 🔥 | 29.1°C | 23.3°C | 17.5°C | 35.2°C | 14.8°C | 8 mm | 66% | 3 m/s | 6.1 |
| 2012 | 25.9°C | 20.4°C | 14.9°C | 30.2°C | 9.6°C | 20 mm | 69% | 2.6 m/s | 5.9 |
| 2011 | 25.1°C | 19.5°C | 13.9°C | 29.0°C | 7.5°C | 7 mm | 69% | 2.7 m/s | 5.9 |
| 2010 🌧️ | 25.0°C | 20.9°C | 16.8°C | 27.7°C | 12.5°C | 149 mm | 79% | 2.4 m/s | 4.6 |
| 2009 | 27.9°C | 22.0°C | 16.2°C | 32.8°C | 12.3°C | 18 mm | 62% | 2.6 m/s | 6.1 |
| 2008 | 26.0°C | 20.9°C | 15.8°C | 32.9°C | 11.4°C | 25 mm | 72% | 2.5 m/s | 5.7 |
| 2007 | 25.9°C | 20.7°C | 15.4°C | 31.1°C | 12.7°C | 38 mm | 73% | 2.7 m/s | 5.8 |
| 2006 | 25.1°C | 20.2°C | 15.3°C | 29.0°C | 9.3°C | 19 mm | 71% | 3 m/s | 5.8 |
| 2005 | 26.7°C | 21.2°C | 15.6°C | 30.7°C | 10.7°C | 8 mm | 66% | 2.7 m/s | 6.2 |
| 2004 | 25.9°C | 20.4°C | 14.8°C | 31.2°C | 9.9°C | 18 mm | 67% | 2.5 m/s | 6.1 |
| 2003 | 27.8°C | 21.6°C | 15.3°C | 31.5°C | 9.1°C | 2 mm | 65% | 2.5 m/s | 6.3 |
| 2002 | 26.7°C | 21.0°C | 15.3°C | 30.5°C | 10.8°C | 8 mm | 69% | 2.6 m/s | 6.3 |
| 2001 | 26.2°C | 20.9°C | 15.6°C | 30.5°C | 11.3°C | 32 mm | 68% | 3 m/s | 5.8 |
| 2000 | 27.9°C | 21.7°C | 15.5°C | 31.7°C | 12.2°C | 0 mm | 61% | 2.6 m/s | 6.3 |
| 1999 | 25.6°C | 20.6°C | 15.7°C | 29.0°C | 12.5°C | 22 mm | 70% | 3.3 m/s | 5.7 |
| 1998 | 24.5°C | 20.7°C | 17.0°C | 28.4°C | 11.0°C | 113 mm | 80% | 3 m/s | 5.1 |
| 1997 | 27.4°C | 21.9°C | 16.4°C | 33.5°C | 12.3°C | 40 mm | 68% | 2.7 m/s | 5.8 |
| 1996 | 26.9°C | 20.5°C | 14.0°C | 32.5°C | 8.1°C | 106 mm | 63% | 2.8 m/s | 6 |
| 1995 | 26.2°C | 20.9°C | 15.5°C | 30.8°C | 8.0°C | 14 mm | 66% | 2.7 m/s | 5.8 |
| 1994 | 26.9°C | 20.8°C | 14.7°C | 32.9°C | 9.5°C | 5 mm | 59% | 2.8 m/s | 6.2 |
| 1993 | 24.7°C | 20.0°C | 15.3°C | 31.8°C | 12.3°C | 74 mm | 72% | 3.1 m/s | 5.7 |
| 1992 | 26.6°C | 20.8°C | 15.0°C | 32.4°C | 10.6°C | 55 mm | 65% | 2.7 m/s | 5.4 |
| 1991 | 28.4°C | 21.8°C | 15.3°C | 33.2°C | 10.5°C | 0 mm | 55% | 2.5 m/s | 6.3 |
| 1990 ❄️ | 24.7°C | 19.1°C | 13.6°C | 28.4°C | 9.3°C | 6 mm | 64% | 2.9 m/s | 6 |
| 1989 | 26.0°C | 20.2°C | 14.3°C | 31.3°C | 9.8°C | 7 mm | 67% | 2.7 m/s | 5.9 |
| 1988 | 25.6°C | 20.5°C | 15.3°C | 34.4°C | 10.5°C | 10 mm | 71% | 2.8 m/s | 6 |
| 1987 | 25.9°C | 20.3°C | 14.8°C | 30.0°C | 9.4°C | 9 mm | 63% | 2.6 m/s | 5.8 |
| 1986 | 25.6°C | 20.3°C | 15.0°C | 30.2°C | 8.9°C | 69 mm | 68% | 2.7 m/s | 5.8 |
| 1985 | 25.8°C | 20.0°C | 14.2°C | 31.1°C | 7.8°C | 41 mm | 65% | 2.9 m/s | 6 |
| 1984 | 25.3°C | 19.4°C | 13.5°C | 28.8°C | 8.1°C | 69 mm | 65% | 2.3 m/s | 5.7 |
| 1983 | 26.4°C | 21.5°C | 16.5°C | 31.3°C | 12.1°C | 13 mm | 75% | 2.7 m/s | — |
| 1982 | 25.4°C | 19.9°C | 14.5°C | 31.7°C | 10.9°C | 48 mm | 70% | 2.7 m/s | — |
| 1981 | 26.4°C | 21.0°C | 15.7°C | 32.5°C | 8.6°C | 2 mm | 66% | 3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 26.4°C with lows near 15.4°C (mean 20.9°C), based on 45 years of NASA POWER data.
September averages 29 mm of rainfall in Gladstone, one of the drier months. The wettest on record was 149 mm in 2010.
The hottest September reached 35.5°C in 2017. The coldest dipped to 7.5°C in 2011.
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 25.9°C to 26.7°C and overnight lows from 14.9°C to 16°C over the same span.
September is one of the cooler months of the year in Gladstone and one of the drier months, so plan for around 26.4°C daytime highs and 15.4°C at night.
Not quite — September is the 5th coolest month in Gladstone, averaging 20.9°C.
For September in Gladstone, pack light layers you can adjust through the day, with typical highs of 26.4°C and lows of 15.4°C.
Relative humidity in September averages 67% — moderately humid.
Average wind speed in September is 2.7 m/s. The windiest September on record averaged 3.3 m/s (1999).
The wettest September on record was 2010 with 149 mm. On average, September sees 29 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 Gladstone 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.
