September is one of the cooler months of the year in Exmouth, with average highs near 27.3°C and lows around 17.7°C (mean 22.5°C). It is one of the drier months, averaging 2 mm of rainfall and 60% relative humidity across the period.
September is one of the cooler months of the year in Exmouth. Across 45 years of records, the warmest September in Exmouth was 2024 — when the month averaged 24.6°C — while the coldest was 1992 at 20.8°C. Typical September days reach 27.3°C with nights near 17.7°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Exmouth, averaging 2 mm of rainfall. The wettest September on record was 2022 with 14 mm, while the driest were 2020, 2021 and 2023, among others at 0 mm.
Relative humidity in Exmouth during September averages 60%. The most humid September was 2014 at 65%, and the least humid was 2010 at 55%.
September receives about 6.6 kWh/m²/day of solar energy in Exmouth. The sunniest Septembers were 2009 and 2011 at 6.9 kWh/m²/day, and the cloudiest was 2001 at 5.8.
Average wind speed in Exmouth during September is 4.7 m/s. The windiest Septembers were 1991 and 2009 at 5.3 m/s, while the calmest was 2015 at 3.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.8°C | 22.0°C | 22.2°C | 22.6°C | 23.3°C | +0.5°C |
| Avg High | 27.7°C | 26.5°C | 27.1°C | 27.4°C | 28.3°C | +0.6°C |
| Avg Low | 17.9°C | 17.5°C | 17.3°C | 17.8°C | 18.4°C | +0.5°C |
| Avg Rain | 3 mm | 2 mm | 2 mm | 2 mm | 4 mm | +1 mm |
September temperatures in Exmouth have risen by about 0.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 12.8°C (1993) to a record high of 36.8°C (2023).
Rainfall in September is one of the drier months, averaging 2 mm, with a wettest year of 14 mm.
One of the best times to visit Exmouth
September is one of the best times to visit Exmouth. Expect days averaging 27.3°C and nights around 17.7°C (mean 22.5°C) — cooler than Exmouth's yearly average — with low rainfall (2 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 | 27.9°C | 23.0°C | 18.1°C | 32.7°C | 14.2°C | 3 mm | 55% | 4.4 m/s | 6.6 |
| 2024 🔥 | 29.4°C | 24.6°C | 19.9°C | 33.5°C | 15.2°C | 7 mm | 56% | 4.1 m/s | 6.2 |
| 2023 | 29.4°C | 24.3°C | 19.1°C | 36.8°C | 15.9°C | 0 mm | 62% | 4.8 m/s | 6.6 |
| 2022 🌧️ | 26.0°C | 21.6°C | 17.2°C | 29.1°C | 14.5°C | 14 mm | 62% | 4.8 m/s | 6.4 |
| 2021 | 27.7°C | 22.7°C | 17.6°C | 33.4°C | 14.3°C | 0 mm | 55% | 4.7 m/s | 6.6 |
| 2020 | 29.1°C | 23.8°C | 18.6°C | 34.6°C | 15.8°C | 0 mm | 57% | 5 m/s | 6.7 |
| 2019 | 28.2°C | 23.2°C | 18.1°C | 32.2°C | 15.7°C | 1 mm | 61% | 4.2 m/s | 6.8 |
| 2018 | 27.7°C | 22.4°C | 17.1°C | 33.9°C | 14.2°C | 0 mm | 56% | 4.7 m/s | 6.8 |
| 2017 | 27.7°C | 23.1°C | 18.5°C | 35.6°C | 15.0°C | 10 mm | 60% | 4.7 m/s | 6.5 |
| 2016 | 26.0°C | 21.1°C | 16.2°C | 28.6°C | 13.2°C | 0 mm | 60% | 5 m/s | 6.6 |
| 2015 | 29.0°C | 23.8°C | 18.6°C | 34.0°C | 13.9°C | 0 mm | 56% | 3.8 m/s | 6.7 |
| 2014 | 27.3°C | 23.1°C | 18.8°C | 30.0°C | 16.3°C | 0 mm | 65% | 4.3 m/s | 6.6 |
| 2013 | 26.8°C | 22.3°C | 17.8°C | 32.8°C | 14.3°C | 1 mm | 62% | 5.1 m/s | 6.6 |
| 2012 | 27.0°C | 22.6°C | 18.3°C | 33.3°C | 14.9°C | 0 mm | 64% | 4.5 m/s | 6.7 |
| 2011 | 27.2°C | 22.2°C | 17.2°C | 30.3°C | 14.8°C | 0 mm | 56% | 4.6 m/s | 6.9 |
| 2010 | 27.4°C | 22.5°C | 17.7°C | 35.5°C | 13.8°C | 5 mm | 55% | 4.1 m/s | 6.3 |
| 2009 | 26.7°C | 21.7°C | 16.6°C | 31.3°C | 14.2°C | 0 mm | 57% | 5.3 m/s | 6.9 |
| 2008 | 27.3°C | 22.6°C | 17.8°C | 31.2°C | 15.1°C | 2 mm | 61% | 4.6 m/s | 6.6 |
| 2007 | 28.0°C | 22.6°C | 17.1°C | 33.2°C | 14.6°C | 0 mm | 59% | 5 m/s | 6.8 |
| 2006 | 28.3°C | 23.5°C | 18.7°C | 33.6°C | 16.4°C | 11 mm | 63% | 4.2 m/s | 6.6 |
| 2005 | 25.6°C | 21.1°C | 16.6°C | 28.7°C | 14.8°C | 2 mm | 65% | 5.2 m/s | 6.6 |
| 2004 | 26.3°C | 21.6°C | 16.8°C | 30.0°C | 13.7°C | 1 mm | 60% | 4.8 m/s | 6.6 |
| 2003 | 26.4°C | 21.9°C | 17.3°C | 29.7°C | 14.8°C | 1 mm | 62% | 5.2 m/s | 6.7 |
| 2002 | 26.9°C | 21.9°C | 17.0°C | 31.5°C | 15.2°C | 3 mm | 59% | 4.9 m/s | 6.7 |
| 2001 | 27.1°C | 22.4°C | 17.7°C | 32.4°C | 13.7°C | 0 mm | 59% | 4.5 m/s | 5.8 |
| 2000 | 28.6°C | 23.2°C | 17.8°C | 33.3°C | 14.1°C | 1 mm | 58% | 4.5 m/s | 6.7 |
| 1999 | 26.3°C | 22.1°C | 17.9°C | 31.8°C | 13.6°C | 4 mm | 65% | 4.6 m/s | 6.5 |
| 1998 | 26.5°C | 22.0°C | 17.4°C | 31.7°C | 14.1°C | 0 mm | 62% | 5.1 m/s | 6.4 |
| 1997 | 26.2°C | 21.6°C | 17.0°C | 30.1°C | 15.1°C | 8 mm | 64% | 5 m/s | 6.5 |
| 1996 | 26.5°C | 21.9°C | 17.4°C | 29.0°C | 15.5°C | 2 mm | 65% | 4.9 m/s | 6.6 |
| 1995 | 26.0°C | 22.1°C | 18.2°C | 28.9°C | 13.8°C | 2 mm | 65% | 4.8 m/s | 6.4 |
| 1994 | 28.1°C | 23.1°C | 18.0°C | 31.0°C | 16.0°C | 0 mm | 62% | 4.9 m/s | 6.8 |
| 1993 | 26.6°C | 22.0°C | 17.3°C | 31.6°C | 12.8°C | 1 mm | 57% | 4.6 m/s | 6.7 |
| 1992 ❄️ | 24.9°C | 20.8°C | 16.8°C | 29.1°C | 14.2°C | 3 mm | 62% | 5.1 m/s | 6 |
| 1991 | 26.5°C | 21.7°C | 17.0°C | 32.2°C | 13.5°C | 1 mm | 59% | 5.3 m/s | 6.7 |
| 1990 | 27.8°C | 22.7°C | 17.7°C | 32.9°C | 15.0°C | 0 mm | 57% | 4.2 m/s | 6.7 |
| 1989 | 28.5°C | 23.1°C | 17.8°C | 31.0°C | 15.8°C | 0 mm | 59% | 4.8 m/s | 6.6 |
| 1988 | 27.9°C | 22.8°C | 17.7°C | 32.2°C | 15.1°C | 1 mm | 61% | 4.7 m/s | 6.7 |
| 1987 | 28.8°C | 23.5°C | 18.2°C | 32.4°C | 15.4°C | 0 mm | 58% | 4.2 m/s | 6.6 |
| 1986 | 26.3°C | 21.6°C | 16.9°C | 29.5°C | 14.9°C | 7 mm | 62% | 4.9 m/s | 6.3 |
| 1985 | 27.3°C | 22.5°C | 17.6°C | 30.6°C | 14.4°C | 0 mm | 61% | 4.9 m/s | 6.5 |
| 1984 | 26.1°C | 21.6°C | 17.2°C | 29.1°C | 13.5°C | 2 mm | 63% | 4.5 m/s | 6.6 |
| 1983 | 28.6°C | 23.6°C | 18.7°C | 33.1°C | 16.1°C | 8 mm | 61% | 4.6 m/s | — |
| 1982 | 26.5°C | 22.3°C | 18.1°C | 31.9°C | 15.8°C | 4 mm | 61% | 4.7 m/s | — |
| 1981 | 28.9°C | 23.8°C | 18.7°C | 34.0°C | 15.8°C | 8 mm | 59% | 4.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 27.3°C with lows near 17.7°C (mean 22.5°C), based on 45 years of NASA POWER data.
September averages 2 mm of rainfall in Exmouth, one of the drier months. The wettest on record was 14 mm in 2022.
The hottest September reached 36.8°C in 2023. The coldest dipped to 12.8°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.4°C. Daytime highs moved from 27.5°C to 28.1°C and overnight lows from 18.1°C to 18.4°C over the same span.
September is one of the cooler months of the year in Exmouth and one of the drier months, so plan for around 27.3°C daytime highs and 17.7°C at night.
Not quite — September is the 4th coolest month in Exmouth, averaging 22.5°C.
For September in Exmouth, pack light layers you can adjust through the day, with typical highs of 27.3°C and lows of 17.7°C.
Relative humidity in September averages 60% — moderately humid.
Average wind speed in September is 4.7 m/s. The windiest September on record averaged 5.3 m/s (1991).
The wettest September on record was 2022 with 14 mm. On average, September sees 2 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 Exmouth 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.
