September is one of the warmer months of the year in Orange, with average highs near 30.4°C and lows around 23.1°C (mean 26.8°C). It is a relatively wet time of year, averaging 142 mm of rainfall and 75% relative humidity across the period.
September is one of the warmer months of the year in Orange. Across 45 years of records, the warmest September in Orange was 2023 — when the month averaged 29.8°C — while the coldest was 1983 at 24.9°C. Typical September days reach 30.4°C with nights near 23.1°C. The long-term trend is warming, about 0.4°C per decade.
September is a relatively wet time of year in Orange, averaging 142 mm of rainfall. The wettest September on record was 2018 with 429 mm, while the driest was 2017 at 36 mm.
Relative humidity in Orange during September averages 75%. The most humid September was 2018 at 85%, and the least humid was 1999 at 65%.
September receives about 5 kWh/m²/day of solar energy in Orange. The sunniest Septembers were 2017 and 2022 at 5.7 kWh/m²/day, and the cloudiest was 2018 at 4.
Average wind speed in Orange during September is 2.1 m/s. The windiest September was 1998 at 3 m/s, while the calmest was 1990 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.0°C | 26.7°C | 26.4°C | 27.3°C | 27.5°C | +1.5°C |
| Avg High | 29.6°C | 30.5°C | 30.1°C | 30.8°C | 31.5°C | +1.9°C |
| Avg Low | 22.3°C | 22.9°C | 22.8°C | 23.8°C | 23.6°C | +1.3°C |
| Avg Rain | 126 mm | 131 mm | 157 mm | 174 mm | 104 mm | -21 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 11.6°C (1983) to a record high of 39.9°C (2000).
Rainfall in September is a relatively wet time of year, averaging 142 mm, with a wettest year of 429 mm.
A good time to visit Orange
September is a good time to visit Orange, with days averaging 30.4°C and nights around 23.1°C (mean 26.8°C, warmer than Orange's yearly average) and higher rainfall. October and April 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 | 32.2°C | 28.0°C | 23.8°C | 34.2°C | 18.6°C | 81 mm | 70% | 1.8 m/s | 5.6 |
| 2024 | 31.4°C | 27.4°C | 23.3°C | 34.2°C | 18.3°C | 62 mm | 76% | 2.1 m/s | 5 |
| 2023 🔥 | 34.3°C | 29.8°C | 25.3°C | 38.4°C | 21.9°C | 80 mm | 66% | 1.8 m/s | 5.3 |
| 2022 | 31.2°C | 27.0°C | 22.8°C | 34.8°C | 14.0°C | 44 mm | 73% | 1.7 m/s | 5.7 |
| 2021 | 29.8°C | 26.3°C | 22.9°C | 34.0°C | 16.7°C | 266 mm | 79% | 2.1 m/s | 4.9 |
| 2020 | 30.0°C | 26.7°C | 23.3°C | 33.4°C | 16.3°C | 93 mm | 78% | 2.5 m/s | 4.6 |
| 2019 | 32.2°C | 28.8°C | 25.3°C | 36.4°C | 23.5°C | 344 mm | 75% | 2.3 m/s | 5.3 |
| 2018 🌧️ | 29.8°C | 27.3°C | 24.8°C | 33.6°C | 22.6°C | 429 mm | 85% | 1.8 m/s | 4 |
| 2017 | 29.4°C | 25.8°C | 22.3°C | 31.4°C | 17.1°C | 36 mm | 78% | 1.9 m/s | 5.7 |
| 2016 | 30.9°C | 27.7°C | 24.5°C | 33.5°C | 16.2°C | 88 mm | 79% | 1.8 m/s | 5.4 |
| 2015 | 30.4°C | 26.8°C | 23.3°C | 33.7°C | 16.9°C | 173 mm | 77% | 1.9 m/s | 5.1 |
| 2014 | 29.6°C | 26.5°C | 23.4°C | 32.9°C | 18.1°C | 128 mm | 82% | 2 m/s | 4.9 |
| 2013 | 31.8°C | 28.2°C | 24.6°C | 35.5°C | 18.9°C | 228 mm | 74% | 2.3 m/s | 5 |
| 2012 | 30.8°C | 26.8°C | 22.8°C | 35.0°C | 16.7°C | 116 mm | 75% | 2.1 m/s | 5.4 |
| 2011 | 31.3°C | 26.7°C | 22.2°C | 34.1°C | 16.1°C | 119 mm | 69% | 2.5 m/s | 5.5 |
| 2010 | 31.9°C | 28.2°C | 24.5°C | 34.4°C | 16.5°C | 83 mm | 72% | 2.2 m/s | 5.4 |
| 2009 | 29.4°C | 26.2°C | 23.0°C | 32.1°C | 17.9°C | 136 mm | 79% | 1.8 m/s | 4.1 |
| 2008 | 28.7°C | 25.1°C | 21.4°C | 32.0°C | 16.6°C | 179 mm | 79% | 2.9 m/s | 5 |
| 2007 | 30.1°C | 26.9°C | 23.7°C | 33.5°C | 19.2°C | 183 mm | 79% | 1.8 m/s | 4.9 |
| 2006 | 29.7°C | 25.9°C | 22.1°C | 32.3°C | 16.3°C | 112 mm | 75% | 2.1 m/s | 5.3 |
| 2005 | 32.9°C | 29.0°C | 25.1°C | 37.2°C | 20.1°C | 216 mm | 70% | 2.4 m/s | 5.2 |
| 2004 | 31.5°C | 27.3°C | 23.1°C | 36.0°C | 18.4°C | 75 mm | 72% | 2.2 m/s | 5.4 |
| 2003 | 28.7°C | 25.3°C | 21.9°C | 31.9°C | 14.2°C | 197 mm | 76% | 2.1 m/s | 5.1 |
| 2002 | 29.4°C | 26.1°C | 22.9°C | 34.0°C | 18.1°C | 156 mm | 82% | 2.7 m/s | 4.3 |
| 2001 | 28.5°C | 25.3°C | 22.1°C | 32.3°C | 13.3°C | 231 mm | 82% | 2.2 m/s | 5 |
| 2000 | 31.8°C | 27.2°C | 22.6°C | 39.9°C | 13.0°C | 89 mm | 69% | 2.6 m/s | 5 |
| 1999 | 31.3°C | 26.6°C | 22.0°C | 35.2°C | 15.2°C | 71 mm | 65% | 2.2 m/s | 5.5 |
| 1998 | 30.7°C | 27.7°C | 24.7°C | 35.1°C | 22.6°C | 321 mm | 82% | 3 m/s | 4.8 |
| 1997 | 31.8°C | 27.7°C | 23.7°C | 34.7°C | 16.9°C | 114 mm | 71% | 2 m/s | 5.3 |
| 1996 | 29.5°C | 26.0°C | 22.4°C | 32.5°C | 13.3°C | 222 mm | 77% | 1.9 m/s | 5 |
| 1995 | 31.9°C | 27.5°C | 23.2°C | 35.7°C | 14.6°C | 47 mm | 69% | 1.8 m/s | 5.5 |
| 1994 | 29.5°C | 25.7°C | 21.9°C | 32.1°C | 13.9°C | 101 mm | 74% | 1.8 m/s | 5.3 |
| 1993 | 32.1°C | 27.5°C | 22.8°C | 35.7°C | 14.8°C | 58 mm | 70% | 2.2 m/s | 5.2 |
| 1992 | 29.8°C | 26.4°C | 22.9°C | 32.5°C | 13.9°C | 86 mm | 77% | 2.4 m/s | 4.6 |
| 1991 | 28.0°C | 25.0°C | 22.1°C | 30.8°C | 14.6°C | 128 mm | 81% | 2.1 m/s | 4.9 |
| 1990 | 30.3°C | 27.0°C | 23.6°C | 35.5°C | 13.8°C | 163 mm | 75% | 1.6 m/s | 4.9 |
| 1989 | 29.5°C | 25.2°C | 21.0°C | 34.0°C | 12.7°C | 57 mm | 73% | 2.1 m/s | 5.2 |
| 1988 | 29.6°C | 26.1°C | 22.6°C | 32.3°C | 15.5°C | 174 mm | 78% | 2.3 m/s | 4.6 |
| 1987 | 30.0°C | 26.1°C | 22.3°C | 33.0°C | 16.9°C | 142 mm | 72% | 1.9 m/s | 5 |
| 1986 | 30.4°C | 27.6°C | 24.9°C | 32.7°C | 21.8°C | 126 mm | 79% | 2 m/s | 4.5 |
| 1985 | 29.8°C | 26.2°C | 22.5°C | 36.0°C | 14.2°C | 130 mm | 75% | 2.5 m/s | 4.9 |
| 1984 | 29.1°C | 25.4°C | 21.7°C | 32.7°C | 12.5°C | 121 mm | 74% | 2.6 m/s | 4.7 |
| 1983 ❄️ | 28.0°C | 24.9°C | 21.8°C | 32.4°C | 11.6°C | 216 mm | 79% | 2.3 m/s | — |
| 1982 | 30.3°C | 26.3°C | 22.3°C | 34.1°C | 14.2°C | 70 mm | 71% | 2.2 m/s | — |
| 1981 | 29.7°C | 25.8°C | 21.9°C | 32.7°C | 13.2°C | 93 mm | 73% | 1.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30.4°C with lows near 23.1°C (mean 26.8°C), based on 45 years of NASA POWER data.
September averages 142 mm of rainfall in Orange, a relatively wet time of year. The wettest on record was 429 mm in 2018.
The hottest September reached 39.9°C in 2000. The coldest dipped to 11.6°C in 1983.
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 29.4°C to 31.8°C and overnight lows from 22°C to 23.6°C over the same span.
September is one of the warmer months of the year in Orange and a relatively wet time of year, so plan for around 30.4°C daytime highs and 23.1°C at night.
Not quite — September is the 9th coolest month in Orange, averaging 26.8°C.
For September in Orange, pack light, breathable clothing and sun protection, with typical highs of 30.4°C and lows of 23.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 75% — quite humid.
Average wind speed in September is 2.1 m/s. The windiest September on record averaged 3 m/s (1998).
The wettest September on record was 2018 with 429 mm. On average, September sees 142 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.
