September is one of the cooler months of the year in Esperance, with average highs near 17°C and lows around 12.5°C (mean 14.8°C). It is about average for rainfall, averaging 47 mm of rainfall and 75% relative humidity across the period.
September is one of the cooler months of the year in Esperance. Across 45 years of records, the warmest September in Esperance was 2023 — when the month averaged 16.3°C — while the coldest was 1992 at 12.9°C. Typical September days reach 17°C with nights near 12.5°C. The long-term September temperature trend is broadly flat.
September is about average for rainfall in Esperance, averaging 47 mm of rainfall. The wettest September on record was 2003 with 98 mm, while the driest was 1981 at 13 mm.
Relative humidity in Esperance during September averages 75%. The most humid September was 1997 at 81%, and the least humid were 1988 and 1994 at 72%.
September receives about 4.8 kWh/m²/day of solar energy in Esperance. The sunniest Septembers were 1989, 2012 and 2024 at 5.2 kWh/m²/day, and the cloudiest was 1992 at 4.2.
Average wind speed in Esperance during September is 5.5 m/s. The windiest September was 1996 at 6.7 m/s, while the calmest was 2004 at 4.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.8°C | 14.6°C | 14.7°C | 14.8°C | 15.1°C | +0.3°C |
| Avg High | 17.1°C | 16.8°C | 17.0°C | 17.0°C | 17.5°C | +0.4°C |
| Avg Low | 12.5°C | 12.5°C | 12.5°C | 12.5°C | 12.8°C | +0.3°C |
| Avg Rain | 33 mm | 51 mm | 58 mm | 52 mm | 36 mm | +3 mm |
September temperatures in Esperance have risen by about 0.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 9°C (1992) to a record high of 27.8°C (1987).
Rainfall in September is about average for rainfall, averaging 47 mm, with a wettest year of 98 mm.
A quieter season to visit Esperance
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Esperance. That said, September — with days averaging 17°C and nights around 12.5°C (mean 14.8°C) and moderate rainfall (47 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 16.9°C | 14.8°C | 12.7°C | 22.1°C | 9.9°C | 42 mm | 76% | 5.5 m/s | 5 |
| 2024 | 17.6°C | 15.3°C | 12.9°C | 21.2°C | 10.8°C | 16 mm | 75% | 5.2 m/s | 5.2 |
| 2023 🔥 | 19.0°C | 16.3°C | 13.6°C | 23.5°C | 9.6°C | 36 mm | 76% | 5.3 m/s | 5 |
| 2022 | 16.9°C | 14.8°C | 12.8°C | 21.3°C | 10.8°C | 41 mm | 77% | 5.9 m/s | 4.7 |
| 2021 | 17.0°C | 14.4°C | 11.8°C | 22.0°C | 9.4°C | 48 mm | 75% | 5.4 m/s | 4.9 |
| 2020 | 17.4°C | 15.2°C | 12.9°C | 21.6°C | 10.3°C | 30 mm | 75% | 5.8 m/s | 5.1 |
| 2019 | 18.5°C | 15.8°C | 13.0°C | 25.0°C | 10.0°C | 24 mm | 74% | 4.9 m/s | 5.1 |
| 2018 | 16.6°C | 14.4°C | 12.3°C | 23.8°C | 9.6°C | 50 mm | 76% | 5.2 m/s | 5 |
| 2017 | 16.4°C | 14.6°C | 12.7°C | 22.4°C | 10.4°C | 62 mm | 76% | 5.1 m/s | 4.5 |
| 2016 | 15.1°C | 13.1°C | 11.1°C | 22.2°C | 9.2°C | 83 mm | 75% | 5.6 m/s | 4.9 |
| 2015 | 16.9°C | 14.4°C | 11.9°C | 22.3°C | 9.5°C | 49 mm | 77% | 5.2 m/s | 5 |
| 2014 | 18.5°C | 16.1°C | 13.7°C | 25.9°C | 10.8°C | 42 mm | 74% | 5.3 m/s | 5 |
| 2013 | 17.7°C | 15.6°C | 13.4°C | 21.5°C | 11.1°C | 82 mm | 76% | 6.2 m/s | 4.8 |
| 2012 | 17.6°C | 15.1°C | 12.6°C | 22.9°C | 10.5°C | 48 mm | 73% | 5.8 m/s | 5.2 |
| 2011 | 17.2°C | 15.0°C | 12.8°C | 21.4°C | 10.8°C | 52 mm | 74% | 5.6 m/s | 4.8 |
| 2010 | 15.8°C | 13.7°C | 11.7°C | 20.0°C | 10.7°C | 30 mm | 75% | 5 m/s | 4.9 |
| 2009 | 15.8°C | 13.7°C | 11.7°C | 19.5°C | 9.7°C | 61 mm | 73% | 6.5 m/s | 4.7 |
| 2008 | 17.7°C | 15.3°C | 12.8°C | 23.5°C | 10.1°C | 83 mm | 74% | 5.9 m/s | 4.5 |
| 2007 | 17.5°C | 15.1°C | 12.7°C | 20.7°C | 10.5°C | 50 mm | 74% | 5.9 m/s | 4.9 |
| 2006 | 17.8°C | 15.6°C | 13.4°C | 24.7°C | 11.5°C | 32 mm | 73% | 5.6 m/s | 4.8 |
| 2005 | 16.8°C | 14.4°C | 12.1°C | 21.4°C | 9.8°C | 80 mm | 74% | 6 m/s | 4.8 |
| 2004 | 16.6°C | 14.3°C | 12.0°C | 19.8°C | 9.3°C | 35 mm | 76% | 4.4 m/s | 5 |
| 2003 🌧️ | 16.3°C | 14.2°C | 12.1°C | 20.3°C | 10.0°C | 98 mm | 76% | 6.4 m/s | 4.8 |
| 2002 | 16.9°C | 14.7°C | 12.4°C | 23.8°C | 11.1°C | 43 mm | 74% | 6.3 m/s | 5.1 |
| 2001 | 17.1°C | 15.0°C | 12.9°C | 22.4°C | 10.4°C | 89 mm | 76% | 5.7 m/s | 4.5 |
| 2000 | 17.2°C | 15.2°C | 13.1°C | 23.1°C | 11.1°C | 14 mm | 76% | 5.6 m/s | 5 |
| 1999 | 17.7°C | 15.2°C | 12.7°C | 24.2°C | 10.7°C | 52 mm | 75% | 5.6 m/s | 4.8 |
| 1998 | 17.1°C | 15.0°C | 12.9°C | 22.8°C | 10.0°C | 69 mm | 73% | 6 m/s | 4.5 |
| 1997 | 16.7°C | 14.8°C | 12.9°C | 20.8°C | 10.8°C | 75 mm | 81% | 5.1 m/s | 4.4 |
| 1996 | 17.2°C | 15.1°C | 13.0°C | 22.4°C | 11.1°C | 86 mm | 73% | 6.7 m/s | 4.9 |
| 1995 | 16.8°C | 14.9°C | 12.9°C | 23.2°C | 9.8°C | 29 mm | 77% | 5.2 m/s | 4.6 |
| 1994 | 17.2°C | 14.9°C | 12.7°C | 23.4°C | 10.5°C | 35 mm | 72% | 5.3 m/s | 5.1 |
| 1993 | 16.6°C | 14.3°C | 12.0°C | 21.2°C | 10.0°C | 23 mm | 74% | 5.4 m/s | 4.9 |
| 1992 ❄️ | 14.3°C | 12.9°C | 11.4°C | 18.4°C | 9.0°C | 77 mm | 77% | 5.5 m/s | 4.2 |
| 1991 | 17.1°C | 14.7°C | 12.3°C | 24.5°C | 9.7°C | 45 mm | 76% | 5.5 m/s | 5 |
| 1990 | 17.2°C | 14.6°C | 12.0°C | 26.6°C | 9.4°C | 20 mm | 74% | 4.7 m/s | 5.1 |
| 1989 | 17.3°C | 15.0°C | 12.6°C | 21.0°C | 9.5°C | 40 mm | 75% | 6.1 m/s | 5.2 |
| 1988 | 17.6°C | 15.4°C | 13.2°C | 22.7°C | 9.8°C | 26 mm | 72% | 5.7 m/s | 4.9 |
| 1987 | 17.6°C | 15.1°C | 12.5°C | 27.8°C | 10.5°C | 20 mm | 74% | 4.5 m/s | 4.7 |
| 1986 | 16.4°C | 14.4°C | 12.4°C | 21.1°C | 11.0°C | 50 mm | 77% | 5.3 m/s | 4.5 |
| 1985 | 16.8°C | 14.6°C | 12.4°C | 21.3°C | 10.4°C | 26 mm | 76% | 5.2 m/s | 4.8 |
| 1984 | 15.0°C | 13.2°C | 11.5°C | 20.0°C | 9.8°C | 44 mm | 74% | 5 m/s | 4.6 |
| 1983 | 18.1°C | 15.6°C | 13.2°C | 24.3°C | 11.0°C | 38 mm | 75% | 5.5 m/s | — |
| 1982 | 17.1°C | 14.7°C | 12.4°C | 22.9°C | 10.2°C | 38 mm | 72% | 4.9 m/s | — |
| 1981 | 17.8°C | 15.2°C | 12.6°C | 22.4°C | 9.5°C | 13 mm | 72% | 4.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17°C with lows near 12.5°C (mean 14.8°C), based on 45 years of NASA POWER data.
September averages 47 mm of rainfall in Esperance, about average for rainfall. The wettest on record was 98 mm in 2003.
The hottest September reached 27.8°C in 1987. The coldest dipped to 9°C in 1992.
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 17°C to 17.5°C and overnight lows from 12.4°C to 12.8°C over the same span.
September is one of the cooler months of the year in Esperance and about average for rainfall, so plan for around 17°C daytime highs and 12.5°C at night.
Not quite — September is the 3rd coolest month in Esperance, averaging 14.8°C.
For September in Esperance, pack light layers you can adjust through the day, with typical highs of 17°C and lows of 12.5°C.
Relative humidity in September averages 75% — moderately humid.
Average wind speed in September is 5.5 m/s. The windiest September on record averaged 6.7 m/s (1996).
The wettest September on record was 2003 with 98 mm. On average, September sees 47 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 Esperance 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.
