September is one of the cooler months of the year in Manjimup, with average highs near 16.3°C and lows around 6.9°C (mean 11.6°C). It is a relatively wet time of year, averaging 85 mm of rainfall and 84% relative humidity across the period.
September is one of the cooler months of the year in Manjimup. Across 45 years of records, the warmest September in Manjimup was 2019 — when the month averaged 13.4°C — while the coldest was 1992 at 9.6°C. Typical September days reach 16.3°C with nights near 6.9°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Manjimup, averaging 85 mm of rainfall. The wettest September on record was 2013 with 183 mm, while the driest was 2018 at 30 mm.
Relative humidity in Manjimup during September averages 84%. The most humid September was 2007 at 87%, and the least humid was 2010 at 78%.
September receives about 4.2 kWh/m²/day of solar energy in Manjimup. The sunniest Septembers were 1987 and 2023 at 4.6 kWh/m²/day, and the cloudiest was 2013 at 3.7.
Average wind speed in Manjimup during September is 3.2 m/s. The windiest September was 2013 at 4.3 m/s, while the calmest were 1982, 1987 and 2004 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 11.1°C | 11.2°C | 11.9°C | 12.3°C | +0.6°C |
| Avg High | 16.6°C | 15.7°C | 15.6°C | 16.8°C | 17.2°C | +0.6°C |
| Avg Low | 6.8°C | 6.6°C | 6.8°C | 6.9°C | 7.4°C | +0.6°C |
| Avg Rain | 82 mm | 98 mm | 96 mm | 78 mm | 60 mm | -21 mm |
September temperatures in Manjimup have risen by about 0.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.1°C (2016) to a record high of 26.3°C (2019).
Rainfall in September is a relatively wet time of year, averaging 85 mm, with a wettest year of 183 mm.
A quieter season to visit Manjimup
If your dates are flexible, the more temperate months of January and February tend to be the most comfortable for visiting Manjimup. That said, September — with days averaging 16.3°C and nights around 6.9°C (mean 11.6°C) and higher rainfall (85 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 | 17.0°C | 12.2°C | 7.4°C | 24.5°C | 3.9°C | 75 mm | 83% | 2.9 m/s | 4.5 |
| 2024 | 17.4°C | 12.4°C | 7.3°C | 22.2°C | 2.8°C | 31 mm | 83% | 2.8 m/s | 4.5 |
| 2023 | 18.1°C | 13.2°C | 8.4°C | 25.3°C | 1.0°C | 73 mm | 83% | 3.3 m/s | 4.6 |
| 2022 | 16.7°C | 11.9°C | 7.1°C | 23.0°C | 3.1°C | 44 mm | 83% | 2.8 m/s | 4.4 |
| 2021 | 16.9°C | 11.7°C | 6.4°C | 23.5°C | 4.4°C | 71 mm | 82% | 3 m/s | 4.4 |
| 2020 | 16.9°C | 12.3°C | 7.7°C | 22.0°C | 4.2°C | 70 mm | 83% | 3.6 m/s | 4.3 |
| 2019 🔥 | 18.9°C | 13.4°C | 7.9°C | 26.3°C | 1.2°C | 37 mm | 79% | 2.9 m/s | 4.4 |
| 2018 | 16.6°C | 11.6°C | 6.6°C | 24.0°C | 0.0°C | 30 mm | 83% | 3.1 m/s | 4.4 |
| 2017 | 16.6°C | 11.9°C | 7.2°C | 21.5°C | 1.9°C | 68 mm | 82% | 3 m/s | 4.2 |
| 2016 | 14.6°C | 9.7°C | 4.8°C | 18.4°C | -0.1°C | 75 mm | 83% | 3.2 m/s | 4 |
| 2015 | 17.7°C | 12.1°C | 6.4°C | 23.9°C | 2.9°C | 43 mm | 79% | 2.9 m/s | 4.4 |
| 2014 | 17.7°C | 12.8°C | 7.9°C | 24.4°C | 2.1°C | 86 mm | 85% | 3.2 m/s | 4.3 |
| 2013 🌧️ | 15.7°C | 12.1°C | 8.6°C | 19.7°C | 4.8°C | 183 mm | 86% | 4.3 m/s | 3.7 |
| 2012 | 16.8°C | 11.7°C | 6.6°C | 22.3°C | 2.7°C | 118 mm | 82% | 3.4 m/s | 4.5 |
| 2011 | 16.2°C | 11.5°C | 6.9°C | 19.7°C | 4.2°C | 103 mm | 84% | 3.3 m/s | 4.4 |
| 2010 | 17.4°C | 11.7°C | 6.0°C | 23.4°C | 3.6°C | 34 mm | 78% | 2.8 m/s | 4.5 |
| 2009 | 13.9°C | 10.0°C | 6.1°C | 18.9°C | 2.8°C | 163 mm | 85% | 4.2 m/s | 4.1 |
| 2008 | 15.8°C | 11.4°C | 6.9°C | 20.4°C | 2.2°C | 85 mm | 84% | 3.3 m/s | 4.1 |
| 2007 | 15.6°C | 11.3°C | 7.1°C | 20.2°C | 3.2°C | 134 mm | 87% | 3.6 m/s | 4 |
| 2006 | 16.6°C | 12.0°C | 7.4°C | 24.3°C | 3.6°C | 55 mm | 82% | 3.4 m/s | 4.1 |
| 2005 | 14.8°C | 10.4°C | 5.9°C | 18.3°C | 1.5°C | 123 mm | 85% | 3.7 m/s | 4.1 |
| 2004 | 15.7°C | 10.8°C | 5.8°C | 19.1°C | 1.5°C | 40 mm | 83% | 2.6 m/s | 4.2 |
| 2003 | 15.4°C | 11.1°C | 6.8°C | 20.7°C | 4.6°C | 130 mm | 85% | 3.8 m/s | 4 |
| 2002 | 15.4°C | 11.1°C | 6.9°C | 21.2°C | 3.2°C | 74 mm | 84% | 3.3 m/s | 4.2 |
| 2001 | 15.7°C | 11.6°C | 7.4°C | 23.8°C | 3.1°C | 102 mm | 84% | 3.4 m/s | 3.9 |
| 2000 | 16.6°C | 12.0°C | 7.4°C | 20.8°C | 3.9°C | 56 mm | 86% | 3.1 m/s | 4.2 |
| 1999 | 15.6°C | 11.1°C | 6.5°C | 22.9°C | 2.8°C | 117 mm | 86% | 3.1 m/s | 4.1 |
| 1998 | 15.1°C | 10.8°C | 6.5°C | 19.9°C | 2.1°C | 127 mm | 84% | 3.4 m/s | 4.1 |
| 1997 | 16.2°C | 11.7°C | 7.1°C | 21.8°C | 2.0°C | 83 mm | 86% | 2.9 m/s | 4.1 |
| 1996 | 14.7°C | 10.9°C | 7.1°C | 17.4°C | 4.4°C | 164 mm | 86% | 3.9 m/s | 4 |
| 1995 | 16.0°C | 11.6°C | 7.2°C | 20.4°C | 4.5°C | 70 mm | 86% | 2.7 m/s | 3.9 |
| 1994 | 16.8°C | 11.5°C | 6.3°C | 23.1°C | 3.8°C | 56 mm | 82% | 2.9 m/s | 4.4 |
| 1993 | 15.8°C | 11.0°C | 6.2°C | 21.4°C | 2.1°C | 110 mm | 84% | 3.1 m/s | 4.4 |
| 1992 ❄️ | 13.5°C | 9.6°C | 5.7°C | 20.2°C | 3.0°C | 87 mm | 87% | 3.2 m/s | 4 |
| 1991 | 16.0°C | 11.6°C | 7.1°C | 21.1°C | 2.6°C | 95 mm | 86% | 2.9 m/s | 4 |
| 1990 | 17.0°C | 11.6°C | 6.1°C | 23.9°C | 2.8°C | 70 mm | 84% | 2.7 m/s | 4.2 |
| 1989 | 16.0°C | 11.5°C | 7.0°C | 19.6°C | 1.7°C | 74 mm | 84% | 3.5 m/s | 4.2 |
| 1988 | 16.0°C | 11.7°C | 7.3°C | 22.0°C | 4.3°C | 116 mm | 86% | 3.7 m/s | 4.2 |
| 1987 | 17.9°C | 12.3°C | 6.8°C | 24.1°C | 3.1°C | 44 mm | 82% | 2.6 m/s | 4.6 |
| 1986 | 16.4°C | 11.6°C | 6.7°C | 24.7°C | 3.3°C | 67 mm | 85% | 3 m/s | 4 |
| 1985 | 17.1°C | 11.8°C | 6.5°C | 22.8°C | 0.7°C | 58 mm | 82% | 2.7 m/s | 4.5 |
| 1984 | 15.4°C | 10.7°C | 6.1°C | 17.6°C | 2.7°C | 94 mm | 84% | 3 m/s | 4.4 |
| 1983 | 16.9°C | 12.5°C | 8.1°C | 22.2°C | 4.6°C | 133 mm | 86% | 3.2 m/s | — |
| 1982 | 17.1°C | 11.6°C | 6.2°C | 24.3°C | 1.1°C | 66 mm | 81% | 2.6 m/s | — |
| 1981 | 16.5°C | 11.7°C | 6.9°C | 22.1°C | 2.0°C | 81 mm | 84% | 3.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.3°C with lows near 6.9°C (mean 11.6°C), based on 45 years of NASA POWER data.
September averages 85 mm of rainfall in Manjimup, a relatively wet time of year. The wettest on record was 183 mm in 2013.
The hottest September reached 26.3°C in 2019. The coldest dipped to -0.1°C in 2016.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.6°C. Daytime highs moved from 16.6°C to 17.2°C and overnight lows from 6.8°C to 7.3°C over the same span.
September is one of the cooler months of the year in Manjimup and a relatively wet time of year, so plan for around 16.3°C daytime highs and 6.9°C at night.
Not quite — September is the 4th coolest month in Manjimup, averaging 11.6°C.
For September in Manjimup, pack warm layers and a jacket for chilly mornings, with typical highs of 16.3°C and lows of 6.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 3.2 m/s. The windiest September on record averaged 4.3 m/s (2013).
The wettest September on record was 2013 with 183 mm. On average, September sees 85 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 Manjimup 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.
