September is one of the cooler months of the year in Penrith, with average highs near 19.7°C and lows around 7°C (mean 13.4°C). It is one of the drier months, averaging 57 mm of rainfall and 72% relative humidity across the period.
September is one of the cooler months of the year in Penrith. Across 45 years of records, the warmest September in Penrith was 2023 — when the month averaged 17°C — while the coldest was 1984 at 11.1°C. Typical September days reach 19.7°C with nights near 7°C. The long-term trend is warming, about 0.5°C per decade.
September is one of the drier months in Penrith, averaging 57 mm of rainfall. The wettest September on record was 1995 with 196 mm, while the driest was 2017 at 1 mm.
Relative humidity in Penrith during September averages 72%. The most humid Septembers were 1990 and 1998 at 83%, and the least humid was 2017 at 49%.
September receives about 4.9 kWh/m²/day of solar energy in Penrith. The sunniest September was 2017 at 5.6 kWh/m²/day, and the cloudiest was 2022 at 4.1.
Average wind speed in Penrith during September is 1.2 m/s. The windiest September was 2017 at 1.5 m/s, while the calmest were 2014, 2020 and 2022, among others at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.5°C | 12.4°C | 14.0°C | 13.7°C | 14.5°C | +2°C |
| Avg High | 18.8°C | 18.3°C | 20.5°C | 20.2°C | 21.1°C | +2.3°C |
| Avg Low | 6.2°C | 6.4°C | 7.4°C | 7.2°C | 7.9°C | +1.7°C |
| Avg Rain | 64 mm | 78 mm | 52 mm | 47 mm | 41 mm | -24 mm |
September temperatures in Penrith have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.3°C (1991) to a record high of 34.6°C (2017).
Rainfall in September is one of the drier months, averaging 57 mm, with a wettest year of 196 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.7°C per decade while lows rose 0.4°C per decade, widening the gap between day and night.
A good time to visit Penrith
September is a good time to visit Penrith, with days averaging 19.7°C and nights around 7°C (mean 13.4°C, cooler than Penrith's yearly average) and moderate rainfall. December and February are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 20.4°C | 14.1°C | 7.7°C | 26.8°C | 3.2°C | 52 mm | 73% | 1.2 m/s | 5.2 |
| 2024 | 22.0°C | 14.9°C | 7.8°C | 28.3°C | 2.2°C | 28 mm | 60% | 1.3 m/s | 5 |
| 2023 🔥 | 25.2°C | 17.0°C | 8.7°C | 34.2°C | 2.5°C | 13 mm | 55% | 1.2 m/s | 5.5 |
| 2022 | 17.2°C | 12.5°C | 7.8°C | 20.8°C | 2.9°C | 86 mm | 83% | 1.1 m/s | 4.1 |
| 2021 | 21.4°C | 14.3°C | 7.1°C | 26.8°C | 2.6°C | 38 mm | 64% | 1.3 m/s | 5 |
| 2020 | 20.2°C | 14.2°C | 8.1°C | 27.1°C | 3.8°C | 27 mm | 75% | 1.1 m/s | 4.7 |
| 2019 | 21.4°C | 14.5°C | 7.5°C | 28.3°C | 3.5°C | 54 mm | 63% | 1.3 m/s | 5.1 |
| 2018 | 21.3°C | 14.1°C | 6.9°C | 30.3°C | 2.9°C | 38 mm | 63% | 1.2 m/s | 4.9 |
| 2017 | 23.1°C | 15.3°C | 7.4°C | 34.6°C | 2.2°C | 1 mm | 49% | 1.5 m/s | 5.6 |
| 2016 | 18.9°C | 13.2°C | 7.5°C | 21.6°C | 3.2°C | 55 mm | 76% | 1.2 m/s | 4.3 |
| 2015 | 18.7°C | 12.7°C | 6.7°C | 25.1°C | 1.3°C | 38 mm | 76% | 1.2 m/s | 4.8 |
| 2014 | 18.7°C | 12.8°C | 7.0°C | 28.0°C | 2.3°C | 48 mm | 78% | 1.1 m/s | 4.9 |
| 2013 | 21.7°C | 15.2°C | 8.6°C | 29.0°C | 4.5°C | 68 mm | 70% | 1.1 m/s | 5.4 |
| 2012 | 20.4°C | 13.4°C | 6.5°C | 28.0°C | 0.0°C | 25 mm | 68% | 1.1 m/s | 5.4 |
| 2011 | 19.3°C | 13.1°C | 7.0°C | 27.1°C | 1.7°C | 81 mm | 75% | 1.2 m/s | 4.8 |
| 2010 | 18.9°C | 12.9°C | 7.0°C | 23.9°C | 2.9°C | 59 mm | 76% | 1.1 m/s | 4.7 |
| 2009 | 21.7°C | 14.9°C | 8.0°C | 29.5°C | 3.2°C | 19 mm | 65% | 1.3 m/s | 5.1 |
| 2008 | 19.9°C | 13.4°C | 6.8°C | 28.5°C | 0.4°C | 78 mm | 72% | 1.2 m/s | 5.1 |
| 2007 | 18.3°C | 12.6°C | 6.8°C | 23.8°C | 3.2°C | 51 mm | 76% | 1.1 m/s | 5 |
| 2006 | 20.4°C | 14.2°C | 7.9°C | 27.3°C | 3.7°C | 140 mm | 73% | 1.2 m/s | 5 |
| 2005 | 20.0°C | 13.5°C | 7.0°C | 28.4°C | 2.9°C | 59 mm | 71% | 1.2 m/s | 4.6 |
| 2004 | 20.1°C | 13.7°C | 7.3°C | 30.3°C | 1.1°C | 64 mm | 71% | 1.1 m/s | 4.7 |
| 2003 | 19.6°C | 13.0°C | 6.4°C | 30.0°C | 1.7°C | 9 mm | 68% | 1.3 m/s | 5.3 |
| 2002 | 22.5°C | 15.0°C | 7.4°C | 30.3°C | 2.0°C | 26 mm | 57% | 1.3 m/s | 5.2 |
| 2001 | 20.2°C | 14.2°C | 8.1°C | 26.6°C | 4.7°C | 29 mm | 78% | 1.1 m/s | 4.6 |
| 2000 | 22.5°C | 15.2°C | 7.9°C | 31.8°C | 2.0°C | 40 mm | 66% | 1.3 m/s | 5 |
| 1999 | 19.2°C | 13.4°C | 7.7°C | 24.2°C | 1.8°C | 36 mm | 79% | 1.1 m/s | 4.6 |
| 1998 | 18.9°C | 13.8°C | 8.6°C | 27.4°C | 1.8°C | 57 mm | 83% | 1.1 m/s | 4.5 |
| 1997 | 17.6°C | 12.3°C | 6.9°C | 22.5°C | 3.5°C | 111 mm | 81% | 1.1 m/s | 4.3 |
| 1996 | 18.6°C | 12.6°C | 6.7°C | 25.6°C | 2.8°C | 91 mm | 73% | 1.3 m/s | 4.9 |
| 1995 🌧️ | 18.1°C | 12.3°C | 6.6°C | 25.7°C | 0.8°C | 196 mm | 77% | 1.2 m/s | 4.3 |
| 1994 | 20.0°C | 12.6°C | 5.1°C | 26.1°C | 0.6°C | 17 mm | 59% | 1.3 m/s | 5.5 |
| 1993 | 17.9°C | 11.9°C | 5.9°C | 24.7°C | 2.5°C | 116 mm | 78% | 1.2 m/s | 4.6 |
| 1992 | 17.9°C | 11.4°C | 5.0°C | 24.3°C | 0.6°C | 28 mm | 72% | 1.2 m/s | 4.6 |
| 1991 | 18.5°C | 11.9°C | 5.3°C | 22.9°C | -0.3°C | 20 mm | 72% | 1.3 m/s | 5.2 |
| 1990 | 16.8°C | 11.5°C | 6.2°C | 24.4°C | 2.8°C | 103 mm | 83% | 1.2 m/s | 4.5 |
| 1989 | 18.0°C | 11.4°C | 4.8°C | 24.2°C | 1.7°C | 5 mm | 77% | 1.2 m/s | 5.3 |
| 1988 | 18.5°C | 13.0°C | 7.4°C | 23.0°C | 4.3°C | 120 mm | 81% | 1.1 m/s | 4.5 |
| 1987 | 19.6°C | 13.0°C | 6.4°C | 28.5°C | 1.3°C | 20 mm | 74% | 1.1 m/s | 5.2 |
| 1986 | 18.1°C | 12.5°C | 6.8°C | 24.9°C | 2.3°C | 66 mm | 80% | 1.1 m/s | 4.7 |
| 1985 | 16.9°C | 11.4°C | 6.0°C | 21.9°C | 2.2°C | 91 mm | 81% | 1.2 m/s | 4.7 |
| 1984 ❄️ | 17.0°C | 11.1°C | 5.1°C | 21.2°C | 1.2°C | 42 mm | 75% | 1.2 m/s | 4.6 |
| 1983 | 19.4°C | 12.9°C | 6.5°C | 27.4°C | 2.3°C | 50 mm | 76% | 1.1 m/s | — |
| 1982 | 18.6°C | 12.3°C | 5.9°C | 28.5°C | 0.1°C | 178 mm | 69% | 1.3 m/s | — |
| 1981 | 23.1°C | 15.2°C | 7.3°C | 32.1°C | 1.7°C | 6 mm | 64% | 1.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.7°C with lows near 7°C (mean 13.4°C), based on 45 years of NASA POWER data.
September averages 57 mm of rainfall in Penrith, one of the drier months. The wettest on record was 196 mm in 1995.
The hottest September reached 34.6°C in 2017. The coldest dipped to -0.3°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2°C. Daytime highs moved from 19°C to 21.2°C and overnight lows from 6.2°C to 7.8°C over the same span.
September is one of the cooler months of the year in Penrith and one of the drier months, so plan for around 19.7°C daytime highs and 7°C at night.
Not quite — September is the 5th coolest month in Penrith, averaging 13.4°C.
For September in Penrith, pack warm layers and a jacket for chilly mornings, with typical highs of 19.7°C and lows of 7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 72% — moderately humid.
Average wind speed in September is 1.2 m/s. The windiest September on record averaged 1.5 m/s (2017).
The wettest September on record was 1995 with 196 mm. On average, September sees 57 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 Penrith 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.
