September is one of the cooler months of the year in Orange, with average highs near 15.6°C and lows around 4.4°C (mean 10°C). It is about average for rainfall, averaging 51 mm of rainfall and 71% relative humidity across the period.
September is one of the cooler months of the year in Orange. Across 45 years of records, the warmest September in Orange was 2023 — when the month averaged 13.3°C — while the coldest were 1984 and 1992 at 7.2°C. Typical September days reach 15.6°C with nights near 4.4°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Orange, averaging 51 mm of rainfall. The wettest September on record was 2005 with 114 mm, while the driest was 2017 at 2 mm.
Relative humidity in Orange during September averages 71%. The most humid September was 1998 at 83%, and the least humid was 2017 at 53%.
September receives about 4.9 kWh/m²/day of solar energy in Orange. The sunniest September was 2023 at 5.8 kWh/m²/day, and the cloudiest was 2016 at 3.8.
Average wind speed in Orange during September is 0.7 m/s. The windiest Septembers were 2009, 2017 and 2019, among others at 0.8 m/s, while the calmest were 2020, 2022 and 2023, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.3°C | 9.1°C | 10.6°C | 10.5°C | 11.1°C | +1.8°C |
| Avg High | 14.7°C | 14.3°C | 16.3°C | 16.3°C | 16.9°C | +2.2°C |
| Avg Low | 3.9°C | 3.9°C | 4.8°C | 4.6°C | 5.3°C | +1.4°C |
| Avg Rain | 59 mm | 70 mm | 49 mm | 38 mm | 33 mm | -26 mm |
September temperatures in Orange have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -3.4°C (1994) to a record high of 29.1°C (2017).
Rainfall in September is about average for rainfall, averaging 51 mm, with a wettest year of 114 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 quieter season to visit Orange
If your dates are flexible, the more temperate months of January and February tend to be the most comfortable for visiting Orange. That said, September — with days averaging 15.6°C and nights around 4.4°C (mean 10°C) and moderate rainfall (51 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 | 17.6°C | 11.3°C | 5.1°C | 25.2°C | -0.1°C | 47 mm | 64% | 0.7 m/s | 5.3 |
| 2024 | 17.1°C | 11.0°C | 4.9°C | 21.6°C | -0.3°C | 21 mm | 61% | 0.7 m/s | 5.3 |
| 2023 🔥 | 20.3°C | 13.3°C | 6.2°C | 27.5°C | -1.0°C | 9 mm | 54% | 0.6 m/s | 5.8 |
| 2022 | 13.8°C | 9.6°C | 5.3°C | 17.3°C | 0.5°C | 72 mm | 81% | 0.6 m/s | 4.2 |
| 2021 | 15.9°C | 10.1°C | 4.4°C | 20.7°C | 0.3°C | 25 mm | 68% | 0.7 m/s | 5 |
| 2020 | 16.9°C | 11.3°C | 5.7°C | 23.5°C | 0.7°C | 26 mm | 74% | 0.6 m/s | 4.9 |
| 2019 | 17.7°C | 11.1°C | 4.6°C | 23.2°C | -1.6°C | 21 mm | 55% | 0.8 m/s | 5.3 |
| 2018 | 17.1°C | 10.7°C | 4.3°C | 24.2°C | -0.4°C | 16 mm | 60% | 0.7 m/s | 5.1 |
| 2017 | 17.2°C | 10.7°C | 4.2°C | 29.1°C | -1.6°C | 2 mm | 53% | 0.8 m/s | 5.1 |
| 2016 | 14.4°C | 9.7°C | 5.0°C | 18.0°C | 1.1°C | 79 mm | 79% | 0.7 m/s | 3.8 |
| 2015 | 15.9°C | 10.1°C | 4.3°C | 21.0°C | -0.6°C | 10 mm | 70% | 0.6 m/s | 5.1 |
| 2014 | 16.0°C | 10.3°C | 4.7°C | 24.2°C | 0.1°C | 33 mm | 71% | 0.6 m/s | 5.1 |
| 2013 | 17.8°C | 12.0°C | 6.2°C | 23.4°C | 2.5°C | 45 mm | 65% | 0.7 m/s | 5.4 |
| 2012 | 15.8°C | 10.0°C | 4.1°C | 23.2°C | -1.5°C | 47 mm | 68% | 0.7 m/s | 5.4 |
| 2011 | 16.4°C | 10.5°C | 4.5°C | 23.7°C | 0.0°C | 61 mm | 67% | 0.7 m/s | 5 |
| 2010 | 14.5°C | 9.5°C | 4.4°C | 19.0°C | -1.4°C | 65 mm | 80% | 0.7 m/s | 4.7 |
| 2009 | 16.6°C | 11.0°C | 5.3°C | 23.4°C | 0.9°C | 48 mm | 67% | 0.8 m/s | 4.8 |
| 2008 | 16.4°C | 10.4°C | 4.4°C | 23.5°C | -0.3°C | 63 mm | 66% | 0.7 m/s | 5.4 |
| 2007 | 16.1°C | 10.1°C | 4.1°C | 22.3°C | 0.8°C | 10 mm | 64% | 0.7 m/s | 5.2 |
| 2006 | 18.4°C | 12.0°C | 5.5°C | 23.1°C | 1.8°C | 27 mm | 58% | 0.7 m/s | 5.2 |
| 2005 🌧️ | 15.2°C | 9.8°C | 4.5°C | 22.1°C | -0.3°C | 114 mm | 76% | 0.7 m/s | 4.6 |
| 2004 | 15.6°C | 10.0°C | 4.5°C | 24.1°C | -1.7°C | 50 mm | 73% | 0.6 m/s | 4.9 |
| 2003 | 15.3°C | 9.6°C | 3.8°C | 24.4°C | -2.1°C | 26 mm | 67% | 0.7 m/s | 5.1 |
| 2002 | 17.0°C | 10.8°C | 4.7°C | 22.9°C | -2.1°C | 45 mm | 56% | 0.7 m/s | 5.1 |
| 2001 | 16.5°C | 11.3°C | 6.0°C | 23.4°C | 2.4°C | 52 mm | 75% | 0.6 m/s | 4.4 |
| 2000 | 16.2°C | 10.7°C | 5.2°C | 24.5°C | 0.1°C | 53 mm | 76% | 0.7 m/s | 4.9 |
| 1999 | 16.3°C | 11.0°C | 5.8°C | 21.8°C | -0.1°C | 59 mm | 73% | 0.6 m/s | 4.8 |
| 1998 | 15.0°C | 10.4°C | 5.8°C | 22.8°C | -0.6°C | 80 mm | 83% | 0.6 m/s | 4.4 |
| 1997 | 14.4°C | 9.7°C | 5.0°C | 17.8°C | 1.9°C | 87 mm | 78% | 0.6 m/s | 4.7 |
| 1996 | 13.5°C | 8.4°C | 3.3°C | 21.4°C | -1.9°C | 90 mm | 75% | 0.8 m/s | 4.8 |
| 1995 | 15.0°C | 9.4°C | 3.9°C | 21.5°C | -2.7°C | 87 mm | 74% | 0.6 m/s | 4.6 |
| 1994 | 14.8°C | 8.6°C | 2.3°C | 21.1°C | -3.4°C | 19 mm | 59% | 0.8 m/s | 5.4 |
| 1993 | 14.0°C | 9.0°C | 4.0°C | 19.0°C | -0.9°C | 103 mm | 80% | 0.6 m/s | 4.6 |
| 1992 | 12.1°C | 7.2°C | 2.2°C | 19.4°C | -2.3°C | 72 mm | 79% | 0.7 m/s | 4.4 |
| 1991 | 13.8°C | 8.4°C | 3.1°C | 19.6°C | -2.2°C | 66 mm | 74% | 0.8 m/s | 5.1 |
| 1990 | 13.9°C | 9.0°C | 4.0°C | 21.1°C | 0.7°C | 42 mm | 82% | 0.6 m/s | 4.8 |
| 1989 | 14.1°C | 8.5°C | 2.9°C | 20.8°C | -0.7°C | 25 mm | 77% | 0.6 m/s | 5.2 |
| 1988 | 14.9°C | 10.0°C | 5.0°C | 18.5°C | 0.7°C | 92 mm | 79% | 0.6 m/s | 4.6 |
| 1987 | 15.4°C | 9.8°C | 4.3°C | 23.9°C | -1.3°C | 24 mm | 72% | 0.7 m/s | 5.1 |
| 1986 | 14.5°C | 9.5°C | 4.4°C | 21.9°C | 0.0°C | 77 mm | 78% | 0.7 m/s | 4.8 |
| 1985 | 13.8°C | 8.6°C | 3.5°C | 20.1°C | -2.2°C | 78 mm | 79% | 0.6 m/s | 4.9 |
| 1984 ❄️ | 11.9°C | 7.2°C | 2.5°C | 18.3°C | -2.6°C | 74 mm | 80% | 0.7 m/s | 4.5 |
| 1983 | 15.4°C | 9.8°C | 4.3°C | 21.3°C | 0.1°C | 81 mm | 78% | 0.7 m/s | — |
| 1982 | 15.5°C | 9.4°C | 3.2°C | 23.9°C | -2.2°C | 53 mm | 62% | 0.7 m/s | — |
| 1981 | 16.6°C | 10.6°C | 4.7°C | 23.6°C | 0.7°C | 26 mm | 73% | 0.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.6°C with lows near 4.4°C (mean 10°C), based on 45 years of NASA POWER data.
September averages 51 mm of rainfall in Orange, about average for rainfall. The wettest on record was 114 mm in 2005.
The hottest September reached 29.1°C in 2017. The coldest dipped to -3.4°C in 1994.
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 14.6°C to 16.9°C and overnight lows from 3.6°C to 5.2°C over the same span.
September is one of the cooler months of the year in Orange and about average for rainfall, so plan for around 15.6°C daytime highs and 4.4°C at night.
Not quite — September is the 4th coolest month in Orange, averaging 10°C.
For September in Orange, pack warm layers and a jacket for chilly mornings, with typical highs of 15.6°C and lows of 4.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 71% — moderately humid.
Average wind speed in September is 0.7 m/s. The windiest September on record averaged 0.8 m/s (1991).
The wettest September on record was 2005 with 114 mm. On average, September sees 51 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 Orange 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.
