September is one of the cooler months of the year in Victor Harbor, with average highs near 16.2°C and lows around 10°C (mean 13.1°C). It is about average for rainfall, averaging 48 mm of rainfall and 74% relative humidity across the period.
September is one of the cooler months of the year in Victor Harbor. Across 45 years of records, the warmest September in Victor Harbor was 2023 — when the month averaged 15.3°C — while the coldest was 1992 at 11.1°C. Typical September days reach 16.2°C with nights near 10°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Victor Harbor, averaging 48 mm of rainfall. The wettest September on record was 1992 with 107 mm, while the driest was 2018 at 11 mm.
Relative humidity in Victor Harbor during September averages 74%. The most humid Septembers were 2010 and 2022 at 80%, and the least humid was 2023 at 67%.
September receives about 4.5 kWh/m²/day of solar energy in Victor Harbor. The sunniest September was 2023 at 5.4 kWh/m²/day, and the cloudiest was 2010 at 3.7.
Average wind speed in Victor Harbor during September is 5.1 m/s. The windiest September was 1996 at 6.8 m/s, while the calmest was 1997 at 4.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.7°C | 12.8°C | 13.4°C | 13.2°C | 13.8°C | +1.1°C |
| Avg High | 15.8°C | 15.8°C | 16.5°C | 16.3°C | 16.9°C | +1.1°C |
| Avg Low | 9.7°C | 9.8°C | 10.2°C | 10.1°C | 10.6°C | +0.9°C |
| Avg Rain | 44 mm | 64 mm | 51 mm | 42 mm | 35 mm | -9 mm |
September temperatures in Victor Harbor have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.7°C (1995) to a record high of 26.6°C (1987).
Rainfall in September is about average for rainfall, averaging 48 mm, with a wettest year of 107 mm.
A quieter season to visit Victor Harbor
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Victor Harbor. That said, September — with days averaging 16.2°C and nights around 10°C (mean 13.1°C) and moderate rainfall (48 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 | 16.6°C | 13.7°C | 10.8°C | 22.7°C | 6.9°C | 20 mm | 73% | 5.4 m/s | 4.5 |
| 2024 | 16.9°C | 13.8°C | 10.7°C | 22.5°C | 6.9°C | 22 mm | 71% | 5.4 m/s | 4.5 |
| 2023 🔥 | 19.3°C | 15.3°C | 11.4°C | 26.5°C | 8.7°C | 11 mm | 67% | 4.5 m/s | 5.4 |
| 2022 | 15.0°C | 12.5°C | 9.9°C | 20.8°C | 7.1°C | 68 mm | 80% | 5 m/s | 3.9 |
| 2021 | 16.7°C | 13.5°C | 10.3°C | 25.7°C | 7.0°C | 34 mm | 72% | 5.5 m/s | 4.6 |
| 2020 | 17.1°C | 13.7°C | 10.4°C | 23.8°C | 6.5°C | 54 mm | 74% | 5.6 m/s | 4.4 |
| 2019 | 16.7°C | 13.3°C | 9.9°C | 25.1°C | 6.9°C | 13 mm | 68% | 4.7 m/s | 4.6 |
| 2018 | 16.0°C | 12.7°C | 9.3°C | 22.1°C | 5.9°C | 11 mm | 68% | 4.9 m/s | 4.9 |
| 2017 | 16.6°C | 13.6°C | 10.5°C | 24.9°C | 6.6°C | 18 mm | 69% | 6.1 m/s | 4.6 |
| 2016 | 14.7°C | 12.2°C | 9.6°C | 21.0°C | 7.5°C | 105 mm | 78% | 5.2 m/s | 3.9 |
| 2015 | 16.1°C | 12.9°C | 9.7°C | 24.4°C | 7.1°C | 22 mm | 71% | 4.4 m/s | 4.6 |
| 2014 | 17.3°C | 13.9°C | 10.5°C | 24.6°C | 7.6°C | 26 mm | 72% | 4.9 m/s | 4.8 |
| 2013 | 18.1°C | 15.0°C | 11.9°C | 22.9°C | 8.8°C | 53 mm | 77% | 5.2 m/s | 4.1 |
| 2012 | 16.3°C | 13.0°C | 9.8°C | 22.6°C | 7.1°C | 32 mm | 73% | 5.1 m/s | 4.5 |
| 2011 | 17.2°C | 13.8°C | 10.4°C | 24.5°C | 7.9°C | 52 mm | 71% | 5.3 m/s | 4.6 |
| 2010 | 14.2°C | 12.0°C | 9.7°C | 17.1°C | 7.2°C | 92 mm | 80% | 4.7 m/s | 3.7 |
| 2009 | 16.6°C | 13.5°C | 10.5°C | 23.7°C | 7.8°C | 68 mm | 73% | 5.4 m/s | 4.2 |
| 2008 | 17.0°C | 13.3°C | 9.7°C | 25.6°C | 5.4°C | 26 mm | 72% | 5.2 m/s | 4.9 |
| 2007 | 17.4°C | 13.8°C | 10.1°C | 25.4°C | 5.2°C | 37 mm | 70% | 5.7 m/s | 4.7 |
| 2006 | 17.4°C | 13.8°C | 10.2°C | 24.8°C | 5.9°C | 31 mm | 68% | 5.3 m/s | 4.7 |
| 2005 | 16.3°C | 13.3°C | 10.2°C | 22.2°C | 6.7°C | 57 mm | 74% | 4.7 m/s | 4.5 |
| 2004 | 15.5°C | 12.7°C | 9.9°C | 23.8°C | 7.5°C | 55 mm | 77% | 4.3 m/s | 4.2 |
| 2003 | 15.2°C | 12.3°C | 9.3°C | 21.6°C | 5.9°C | 49 mm | 76% | 6.3 m/s | 4.6 |
| 2002 | 16.3°C | 13.3°C | 10.3°C | 26.0°C | 7.1°C | 44 mm | 70% | 6 m/s | 4.5 |
| 2001 | 17.0°C | 13.8°C | 10.6°C | 24.6°C | 7.5°C | 86 mm | 77% | 5 m/s | 4.1 |
| 2000 | 16.5°C | 13.7°C | 10.9°C | 25.3°C | 8.3°C | 56 mm | 78% | 5.7 m/s | 4.2 |
| 1999 | 17.6°C | 14.1°C | 10.7°C | 26.5°C | 7.6°C | 53 mm | 72% | 4.8 m/s | 4.5 |
| 1998 | 17.1°C | 13.6°C | 10.1°C | 24.2°C | 7.3°C | 50 mm | 75% | 4.9 m/s | 4.5 |
| 1997 | 15.9°C | 12.9°C | 9.9°C | 20.7°C | 7.5°C | 84 mm | 79% | 4.2 m/s | 4.3 |
| 1996 | 14.9°C | 12.2°C | 9.6°C | 22.0°C | 7.2°C | 85 mm | 75% | 6.8 m/s | 4.4 |
| 1995 | 15.7°C | 12.6°C | 9.5°C | 22.2°C | 4.7°C | 38 mm | 76% | 4.6 m/s | 4.2 |
| 1994 | 14.8°C | 12.1°C | 9.5°C | 20.6°C | 7.8°C | 23 mm | 73% | 4.8 m/s | 4.5 |
| 1993 | 16.1°C | 13.0°C | 9.8°C | 22.5°C | 6.0°C | 69 mm | 75% | 4.5 m/s | 4.5 |
| 1992 ❄️ 🌧️ | 13.2°C | 11.1°C | 8.9°C | 17.4°C | 7.7°C | 107 mm | 79% | 4.8 m/s | 4.1 |
| 1991 | 16.1°C | 12.9°C | 9.6°C | 22.5°C | 7.5°C | 86 mm | 77% | 5.4 m/s | 4.3 |
| 1990 | 16.7°C | 13.4°C | 10.1°C | 24.3°C | 6.7°C | 46 mm | 74% | 5 m/s | 4.6 |
| 1989 | 15.5°C | 12.6°C | 9.7°C | 23.0°C | 7.7°C | 43 mm | 77% | 5 m/s | 4.7 |
| 1988 | 17.2°C | 13.8°C | 10.4°C | 23.3°C | 6.5°C | 53 mm | 71% | 5.2 m/s | 4.7 |
| 1987 | 16.3°C | 13.3°C | 10.2°C | 26.6°C | 6.3°C | 16 mm | 73% | 4.4 m/s | 4.5 |
| 1986 | 15.2°C | 12.5°C | 9.9°C | 21.3°C | 7.5°C | 55 mm | 78% | 5.3 m/s | 4.6 |
| 1985 | 14.9°C | 12.0°C | 9.1°C | 21.3°C | 7.1°C | 55 mm | 75% | 4.9 m/s | 4.7 |
| 1984 | 13.7°C | 11.2°C | 8.7°C | 21.1°C | 5.4°C | 64 mm | 75% | 5.4 m/s | 4.3 |
| 1983 | 15.8°C | 12.7°C | 9.5°C | 22.8°C | 5.8°C | 57 mm | 77% | 5.5 m/s | — |
| 1982 | 15.9°C | 12.6°C | 9.4°C | 23.2°C | 7.6°C | 26 mm | 69% | 4.9 m/s | — |
| 1981 | 17.3°C | 13.9°C | 10.5°C | 25.0°C | 7.8°C | 26 mm | 74% | 4.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.2°C with lows near 10°C (mean 13.1°C), based on 45 years of NASA POWER data.
September averages 48 mm of rainfall in Victor Harbor, about average for rainfall. The wettest on record was 107 mm in 1992.
The hottest September reached 26.6°C in 1987. The coldest dipped to 4.7°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.3°C. Daytime highs moved from 15.5°C to 16.9°C and overnight lows from 9.4°C to 10.6°C over the same span.
September is one of the cooler months of the year in Victor Harbor and about average for rainfall, so plan for around 16.2°C daytime highs and 10°C at night.
Not quite — September is the 4th coolest month in Victor Harbor, averaging 13.1°C.
For September in Victor Harbor, pack light layers you can adjust through the day, with typical highs of 16.2°C and lows of 10°C.
Relative humidity in September averages 74% — moderately humid.
Average wind speed in September is 5.1 m/s. The windiest September on record averaged 6.8 m/s (1996).
The wettest September on record was 1992 with 107 mm. On average, September sees 48 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 Victor Harbor 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.
