September is one of the cooler months of the year in Katanning, with average highs near 18.1°C and lows around 6.2°C (mean 12.2°C). It is about average for rainfall, averaging 44 mm of rainfall and 78% relative humidity across the period.
September is one of the cooler months of the year in Katanning. Across 45 years of records, the warmest September in Katanning was 2019 — when the month averaged 14.2°C — while the coldest was 1992 at 9.7°C. Typical September days reach 18.1°C with nights near 6.2°C. The long-term September temperature trend is broadly flat.
September is about average for rainfall in Katanning, averaging 44 mm of rainfall. The wettest September on record was 2013 with 101 mm, while the driest was 2010 at 14 mm.
Relative humidity in Katanning during September averages 78%. The most humid September was 1992 at 85%, and the least humid was 2010 at 71%.
September receives about 4.7 kWh/m²/day of solar energy in Katanning. The sunniest Septembers were 2019 and 2024 at 5.2 kWh/m²/day, and the cloudiest were 1992 and 1997 at 4.3.
Average wind speed in Katanning during September is 3.2 m/s. The windiest September was 2013 at 4.1 m/s, while the calmest were 1982 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 | 12.4°C | 11.8°C | 11.8°C | 12.4°C | 12.5°C | +0.1°C |
| Avg High | 18.5°C | 17.5°C | 17.5°C | 18.6°C | 18.4°C | -0.1°C |
| Avg Low | 6.2°C | 6.0°C | 6.0°C | 6.2°C | 6.7°C | +0.5°C |
| Avg Rain | 38 mm | 47 mm | 42 mm | 43 mm | 54 mm | +16 mm |
September temperatures in Katanning have stayed relatively stable across the record.
September has ranged from a record low of -0.7°C (2016) to a record high of 30.8°C (2006).
Rainfall in September is about average for rainfall, averaging 44 mm, with a wettest year of 101 mm.
A quieter season to visit Katanning
If your dates are flexible, the more temperate months of December and February tend to be the most comfortable for visiting Katanning. That said, September — with days averaging 18.1°C and nights around 6.2°C (mean 12.2°C) and moderate rainfall (44 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 | 17.8°C | 12.1°C | 6.4°C | 26.0°C | 2.0°C | 64 mm | 81% | 2.9 m/s | 5 |
| 2024 | 19.1°C | 12.8°C | 6.6°C | 25.5°C | 3.2°C | 23 mm | 78% | 2.7 m/s | 5.2 |
| 2023 | 20.0°C | 14.1°C | 8.2°C | 30.7°C | 1.0°C | 64 mm | 79% | 3.1 m/s | 4.9 |
| 2022 | 17.7°C | 12.1°C | 6.5°C | 24.9°C | 2.4°C | 36 mm | 79% | 2.8 m/s | 4.8 |
| 2021 | 17.6°C | 11.5°C | 5.4°C | 25.3°C | 2.1°C | 68 mm | 79% | 2.9 m/s | 4.8 |
| 2020 | 18.1°C | 12.5°C | 6.9°C | 26.4°C | 3.6°C | 68 mm | 81% | 3.4 m/s | 5 |
| 2019 🔥 | 21.1°C | 14.2°C | 7.4°C | 29.3°C | 0.5°C | 19 mm | 74% | 2.8 m/s | 5.2 |
| 2018 | 18.1°C | 12.0°C | 5.8°C | 27.4°C | -0.5°C | 20 mm | 78% | 3 m/s | 4.7 |
| 2017 | 17.9°C | 12.4°C | 6.8°C | 24.0°C | 1.6°C | 58 mm | 78% | 2.9 m/s | 4.6 |
| 2016 | 15.8°C | 9.9°C | 3.9°C | 20.7°C | -0.7°C | 44 mm | 80% | 3 m/s | 4.7 |
| 2015 | 19.9°C | 12.8°C | 5.6°C | 28.3°C | 1.8°C | 20 mm | 71% | 2.9 m/s | 5.1 |
| 2014 | 19.6°C | 13.5°C | 7.5°C | 27.7°C | 3.1°C | 49 mm | 79% | 3.1 m/s | 4.7 |
| 2013 🌧️ | 17.2°C | 12.4°C | 7.5°C | 21.0°C | 4.4°C | 101 mm | 82% | 4.1 m/s | 4.5 |
| 2012 | 19.0°C | 12.6°C | 6.2°C | 26.3°C | 1.6°C | 57 mm | 75% | 3.5 m/s | 5 |
| 2011 | 17.6°C | 11.9°C | 6.3°C | 22.6°C | 3.5°C | 52 mm | 78% | 3.2 m/s | 4.7 |
| 2010 | 19.3°C | 12.4°C | 5.5°C | 26.4°C | 3.0°C | 14 mm | 71% | 2.8 m/s | 5 |
| 2009 | 15.4°C | 10.3°C | 5.2°C | 21.4°C | 2.7°C | 65 mm | 81% | 4 m/s | 4.5 |
| 2008 | 17.8°C | 12.1°C | 6.4°C | 24.8°C | 0.3°C | 47 mm | 77% | 3.4 m/s | 4.6 |
| 2007 | 17.6°C | 11.9°C | 6.2°C | 22.6°C | 3.0°C | 55 mm | 82% | 3.5 m/s | 4.6 |
| 2006 | 18.8°C | 12.7°C | 6.5°C | 30.8°C | 1.7°C | 20 mm | 76% | 3.4 m/s | 4.8 |
| 2005 | 16.3°C | 10.7°C | 5.1°C | 21.7°C | 0.1°C | 53 mm | 80% | 3.6 m/s | 4.6 |
| 2004 | 18.0°C | 11.6°C | 5.3°C | 22.0°C | 0.5°C | 19 mm | 74% | 2.6 m/s | 4.7 |
| 2003 | 16.8°C | 11.6°C | 6.3°C | 25.0°C | 3.6°C | 65 mm | 80% | 3.7 m/s | 4.6 |
| 2002 | 17.8°C | 11.9°C | 6.0°C | 24.8°C | 1.8°C | 29 mm | 77% | 3.4 m/s | 4.7 |
| 2001 | 17.5°C | 11.9°C | 6.3°C | 28.5°C | 1.6°C | 44 mm | 80% | 3.3 m/s | 4.4 |
| 2000 | 19.0°C | 13.0°C | 7.0°C | 24.6°C | 2.9°C | 19 mm | 78% | 3.2 m/s | 4.9 |
| 1999 | 17.7°C | 11.8°C | 5.9°C | 23.0°C | 0.9°C | 57 mm | 80% | 3.1 m/s | 4.6 |
| 1998 | 16.6°C | 11.2°C | 5.8°C | 22.0°C | 1.2°C | 49 mm | 80% | 3.4 m/s | 4.6 |
| 1997 | 17.8°C | 12.2°C | 6.6°C | 25.5°C | 2.3°C | 39 mm | 80% | 2.8 m/s | 4.3 |
| 1996 | 17.0°C | 11.5°C | 6.1°C | 21.0°C | 2.3°C | 74 mm | 81% | 3.8 m/s | 4.6 |
| 1995 | 18.0°C | 12.3°C | 6.5°C | 23.5°C | 3.3°C | 49 mm | 80% | 2.7 m/s | 4.4 |
| 1994 | 19.3°C | 12.5°C | 5.8°C | 26.4°C | 1.0°C | 32 mm | 75% | 3 m/s | 5 |
| 1993 | 17.6°C | 11.7°C | 5.8°C | 24.5°C | 2.5°C | 39 mm | 77% | 3.1 m/s | 4.8 |
| 1992 ❄️ | 14.2°C | 9.7°C | 5.3°C | 21.9°C | 2.4°C | 53 mm | 85% | 3.2 m/s | 4.3 |
| 1991 | 17.8°C | 12.1°C | 6.5°C | 26.8°C | 1.9°C | 49 mm | 80% | 3 m/s | 4.8 |
| 1990 | 19.3°C | 12.5°C | 5.7°C | 29.6°C | 0.7°C | 34 mm | 74% | 2.7 m/s | 4.8 |
| 1989 | 17.9°C | 12.0°C | 6.1°C | 23.3°C | 1.2°C | 26 mm | 79% | 3.5 m/s | 4.8 |
| 1988 | 17.9°C | 12.2°C | 6.6°C | 24.8°C | 3.1°C | 50 mm | 79% | 3.6 m/s | 4.5 |
| 1987 | 20.4°C | 13.5°C | 6.6°C | 28.3°C | 1.8°C | 21 mm | 73% | 2.7 m/s | 5 |
| 1986 | 18.5°C | 12.5°C | 6.4°C | 27.7°C | 1.6°C | 32 mm | 78% | 3 m/s | 4.6 |
| 1985 | 19.1°C | 12.7°C | 6.2°C | 25.3°C | 0.9°C | 26 mm | 74% | 2.9 m/s | 4.8 |
| 1984 | 16.5°C | 10.9°C | 5.3°C | 20.5°C | 1.3°C | 61 mm | 80% | 3.1 m/s | 4.9 |
| 1983 | 18.7°C | 13.0°C | 7.3°C | 26.7°C | 4.1°C | 64 mm | 81% | 3.3 m/s | — |
| 1982 | 18.7°C | 12.0°C | 5.3°C | 27.8°C | 0.6°C | 37 mm | 74% | 2.6 m/s | — |
| 1981 | 19.1°C | 12.7°C | 6.2°C | 26.9°C | 0.9°C | 26 mm | 75% | 3.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 18.1°C with lows near 6.2°C (mean 12.2°C), based on 45 years of NASA POWER data.
September averages 44 mm of rainfall in Katanning, about average for rainfall. The wettest on record was 101 mm in 2013.
The hottest September reached 30.8°C in 2006. The coldest dipped to -0.7°C in 2016.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.2°C. Daytime highs moved from 18.4°C to 18.4°C and overnight lows from 6.1°C to 6.6°C over the same span.
September is one of the cooler months of the year in Katanning and about average for rainfall, so plan for around 18.1°C daytime highs and 6.2°C at night.
Not quite — September is the 4th coolest month in Katanning, averaging 12.2°C.
For September in Katanning, pack warm layers and a jacket for chilly mornings, with typical highs of 18.1°C and lows of 6.2°C.
Relative humidity in September averages 78% — quite humid.
Average wind speed in September is 3.2 m/s. The windiest September on record averaged 4.1 m/s (2013).
The wettest September on record was 2013 with 101 mm. On average, September sees 44 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 Katanning 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.
