September is one of the cooler months of the year in Dunedin, with average highs near 11°C and lows around 6.9°C (mean 9°C). It is one of the drier months, averaging 46 mm of rainfall and 81% relative humidity across the period.
September is one of the cooler months of the year in Dunedin. Across 45 years of records, the warmest September in Dunedin was 2001 — when the month averaged 10.2°C — while the coldest was 1992 at 6.9°C. Typical September days reach 11°C with nights near 6.9°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Dunedin, averaging 46 mm of rainfall. The wettest September on record was 1995 with 112 mm, while the driest was 1989 at 14 mm.
Relative humidity in Dunedin during September averages 81%. The most humid September was 1991 at 86%, and the least humid was 2025 at 76%.
September receives about 3.4 kWh/m²/day of solar energy in Dunedin. The sunniest Septembers were 1985, 1986 and 2021 at 3.7 kWh/m²/day, and the cloudiest was 1995 at 3.
Average wind speed in Dunedin during September is 5.3 m/s. The windiest Septembers were 1981 and 1987 at 6.7 m/s, while the calmest were 1991 and 1996 at 4.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.1°C | 8.4°C | 9.3°C | 9.0°C | 9.4°C | +0.3°C |
| Avg High | 11.1°C | 10.3°C | 11.4°C | 11.0°C | 11.7°C | +0.6°C |
| Avg Low | 7.1°C | 6.4°C | 7.2°C | 7.0°C | 7.1°C | 0°C |
| Avg Rain | 46 mm | 48 mm | 60 mm | 34 mm | 40 mm | -6 mm |
September temperatures in Dunedin have risen by about 0.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 2.8°C (1997) to a record high of 18.7°C (1999).
Rainfall in September is one of the drier months, averaging 46 mm, with a wettest year of 112 mm.
A quieter season to visit Dunedin
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Dunedin. That said, September — with days averaging 11°C and nights around 6.9°C (mean 9°C) and moderate rainfall (46 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 | 11.9°C | 9.4°C | 6.8°C | 16.3°C | 4.9°C | 42 mm | 76% | 6 m/s | 3.5 |
| 2024 | 11.7°C | 9.4°C | 7.1°C | 15.2°C | 4.6°C | 52 mm | 79% | 5.4 m/s | 3.4 |
| 2023 | 11.8°C | 9.6°C | 7.5°C | 17.5°C | 5.2°C | 50 mm | 80% | 5.5 m/s | 3.3 |
| 2022 | 11.0°C | 9.2°C | 7.3°C | 15.7°C | 4.8°C | 21 mm | 83% | 5 m/s | 3.3 |
| 2021 | 11.8°C | 9.4°C | 7.1°C | 15.3°C | 4.9°C | 38 mm | 77% | 5.1 m/s | 3.7 |
| 2020 | 11.9°C | 9.5°C | 7.0°C | 15.4°C | 3.3°C | 38 mm | 79% | 5.1 m/s | 3.4 |
| 2019 | 11.1°C | 9.0°C | 6.8°C | 14.9°C | 4.4°C | 24 mm | 80% | 5.2 m/s | 3.4 |
| 2018 | 11.5°C | 9.4°C | 7.2°C | 16.4°C | 5.3°C | 35 mm | 81% | 4.7 m/s | 3.4 |
| 2017 | 11.4°C | 9.6°C | 7.8°C | 16.3°C | 5.2°C | 37 mm | 84% | 5.3 m/s | 3.1 |
| 2016 | 11.1°C | 9.4°C | 7.7°C | 16.2°C | 5.6°C | 22 mm | 85% | 4.7 m/s | 3.1 |
| 2015 | 9.9°C | 7.9°C | 6.0°C | 15.9°C | 4.0°C | 22 mm | 81% | 5.4 m/s | 3.3 |
| 2014 | 11.2°C | 9.1°C | 7.1°C | 14.6°C | 5.1°C | 35 mm | 81% | 4.8 m/s | 3.6 |
| 2013 | 11.0°C | 9.1°C | 7.2°C | 14.9°C | 4.7°C | 39 mm | 80% | 5.1 m/s | 3.3 |
| 2012 | 11.6°C | 9.6°C | 7.6°C | 15.5°C | 4.6°C | 44 mm | 80% | 5.3 m/s | 3.3 |
| 2011 | 10.3°C | 8.3°C | 6.3°C | 13.9°C | 3.6°C | 28 mm | 82% | 6 m/s | 3.5 |
| 2010 | 10.4°C | 8.3°C | 6.3°C | 14.6°C | 3.3°C | 56 mm | 82% | 6.3 m/s | 3.2 |
| 2009 | 11.2°C | 9.1°C | 7.1°C | 15.7°C | 4.6°C | 34 mm | 78% | 4.7 m/s | 3.4 |
| 2008 | 11.8°C | 9.5°C | 7.3°C | 17.4°C | 5.0°C | 43 mm | 81% | 4.4 m/s | 3.2 |
| 2007 | 11.3°C | 9.2°C | 7.1°C | 14.3°C | 4.5°C | 43 mm | 81% | 4.3 m/s | 3.3 |
| 2006 | 12.1°C | 9.8°C | 7.6°C | 15.8°C | 5.4°C | 55 mm | 80% | 5.5 m/s | 3.6 |
| 2005 | 11.0°C | 9.1°C | 7.1°C | 14.9°C | 5.1°C | 87 mm | 83% | 4.9 m/s | 3.1 |
| 2004 | 10.5°C | 8.4°C | 6.3°C | 14.3°C | 3.5°C | 88 mm | 80% | 5.7 m/s | 3.3 |
| 2003 | 10.6°C | 8.5°C | 6.5°C | 13.8°C | 4.9°C | 103 mm | 80% | 5.5 m/s | 3.2 |
| 2002 | 12.1°C | 9.7°C | 7.3°C | 16.4°C | 4.8°C | 81 mm | 78% | 5.7 m/s | 3.3 |
| 2001 🔥 | 12.5°C | 10.2°C | 8.0°C | 16.6°C | 6.0°C | 18 mm | 80% | 5.1 m/s | 3.4 |
| 2000 | 10.9°C | 9.1°C | 7.2°C | 16.3°C | 4.9°C | 44 mm | 81% | 5.8 m/s | 3.4 |
| 1999 | 11.6°C | 9.5°C | 7.3°C | 18.7°C | 4.4°C | 45 mm | 82% | 4.8 m/s | 3.2 |
| 1998 | 11.6°C | 9.2°C | 6.9°C | 15.5°C | 5.0°C | 43 mm | 79% | 5.9 m/s | 3.5 |
| 1997 | 9.5°C | 7.7°C | 5.9°C | 13.8°C | 2.8°C | 20 mm | 80% | 5.3 m/s | 3.4 |
| 1996 | 11.7°C | 9.6°C | 7.5°C | 15.6°C | 4.6°C | 27 mm | 83% | 4.2 m/s | 3.3 |
| 1995 🌧️ | 10.1°C | 8.0°C | 5.9°C | 14.8°C | 3.9°C | 112 mm | 83% | 5 m/s | 3 |
| 1994 | 9.2°C | 7.4°C | 5.7°C | 12.3°C | 2.9°C | 48 mm | 82% | 5.8 m/s | 3.3 |
| 1993 | 9.8°C | 8.0°C | 6.2°C | 16.4°C | 4.2°C | 45 mm | 81% | 6 m/s | 3.3 |
| 1992 ❄️ | 8.5°C | 6.9°C | 5.2°C | 10.7°C | 4.0°C | 71 mm | 84% | 5.4 m/s | 3.2 |
| 1991 | 10.7°C | 8.9°C | 7.1°C | 14.6°C | 5.7°C | 47 mm | 86% | 4.2 m/s | 3.3 |
| 1990 | 10.8°C | 8.7°C | 6.7°C | 15.7°C | 4.9°C | 25 mm | 81% | 4.9 m/s | 3.4 |
| 1989 | 11.6°C | 9.7°C | 7.9°C | 17.7°C | 4.4°C | 14 mm | 85% | 4.7 m/s | 3.5 |
| 1988 | 11.6°C | 9.4°C | 7.2°C | 15.5°C | 3.5°C | 40 mm | 83% | 4.8 m/s | 3.4 |
| 1987 | 10.6°C | 8.5°C | 6.4°C | 14.5°C | 4.6°C | 71 mm | 81% | 6.7 m/s | 3.3 |
| 1986 | 10.7°C | 8.7°C | 6.7°C | 14.6°C | 4.3°C | 34 mm | 81% | 4.9 m/s | 3.7 |
| 1985 | 11.7°C | 9.6°C | 7.5°C | 16.0°C | 4.8°C | 32 mm | 81% | 5.8 m/s | 3.7 |
| 1984 | 11.2°C | 9.2°C | 7.3°C | 15.3°C | 5.4°C | 65 mm | 84% | 5 m/s | 3.6 |
| 1983 | 10.3°C | 8.5°C | 6.6°C | 13.5°C | 4.7°C | 74 mm | 83% | 5.8 m/s | — |
| 1982 | 11.3°C | 9.3°C | 7.3°C | 14.8°C | 5.2°C | 38 mm | 81% | 4.5 m/s | — |
| 1981 | 10.9°C | 8.8°C | 6.7°C | 13.7°C | 3.7°C | 47 mm | 79% | 6.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 11°C with lows near 6.9°C (mean 9°C), based on 45 years of NASA POWER data.
September averages 46 mm of rainfall in Dunedin, one of the drier months. The wettest on record was 112 mm in 1995.
The hottest September reached 18.7°C in 1999. The coldest dipped to 2.8°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.3°C. Daytime highs moved from 11.1°C to 11.6°C and overnight lows from 7.1°C to 7.2°C over the same span.
September is one of the cooler months of the year in Dunedin and one of the drier months, so plan for around 11°C daytime highs and 6.9°C at night.
Not quite — September is the 4th coolest month in Dunedin, averaging 9°C.
For September in Dunedin, pack warm layers and a jacket for chilly mornings, with typical highs of 11°C and lows of 6.9°C.
Relative humidity in September averages 81% — quite humid.
Average wind speed in September is 5.3 m/s. The windiest September on record averaged 6.7 m/s (1981).
The wettest September on record was 1995 with 112 mm. On average, September sees 46 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 Dunedin 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.
