September is one of the cooler months of the year in Devonport, with average highs near 12.8°C and lows around 9.1°C (mean 11°C). It is a relatively wet time of year, averaging 90 mm of rainfall and 81% relative humidity across the period.
September is one of the cooler months of the year in Devonport. Across 45 years of records, the warmest September in Devonport was 2023 — when the month averaged 12.2°C — while the coldest was 1994 at 9.5°C. Typical September days reach 12.8°C with nights near 9.1°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Devonport, averaging 90 mm of rainfall. The wettest September on record was 1996 with 227 mm, while the driest was 2015 at 27 mm.
Relative humidity in Devonport during September averages 81%. The most humid September was 2016 at 84%, and the least humid were 2021 and 2025 at 78%.
September receives about 3.7 kWh/m²/day of solar energy in Devonport. The sunniest September was 1987 at 4.2 kWh/m²/day, and the cloudiest was 2009 at 3.2.
Average wind speed in Devonport during September is 4 m/s. The windiest September was 2003 at 5.4 m/s, while the calmest was 2015 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.9°C | 10.5°C | 11.2°C | 11.0°C | 11.4°C | +0.5°C |
| Avg High | 12.8°C | 12.3°C | 13.0°C | 12.9°C | 13.2°C | +0.4°C |
| Avg Low | 8.9°C | 8.6°C | 9.4°C | 9.2°C | 9.6°C | +0.7°C |
| Avg Rain | 86 mm | 96 mm | 102 mm | 83 mm | 78 mm | -7 mm |
September temperatures in Devonport have risen by about 0.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4°C (1994) to a record high of 16.9°C (2022).
Rainfall in September is a relatively wet time of year, averaging 90 mm, with a wettest year of 227 mm.
A quieter season to visit Devonport
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Devonport. That said, September — with days averaging 12.8°C and nights around 9.1°C (mean 11°C) and higher rainfall (90 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 | 13.1°C | 11.4°C | 9.6°C | 14.9°C | 7.5°C | 123 mm | 78% | 5 m/s | 3.6 |
| 2024 | 13.2°C | 11.4°C | 9.5°C | 14.4°C | 6.3°C | 84 mm | 80% | 5.2 m/s | 3.4 |
| 2023 🔥 | 14.1°C | 12.2°C | 10.2°C | 16.8°C | 7.9°C | 38 mm | 80% | 3.8 m/s | 4.1 |
| 2022 | 13.0°C | 11.3°C | 9.5°C | 16.9°C | 6.4°C | 75 mm | 82% | 3.3 m/s | 3.5 |
| 2021 | 12.9°C | 11.0°C | 9.1°C | 15.3°C | 6.8°C | 71 mm | 78% | 4.5 m/s | 3.8 |
| 2020 | 12.7°C | 11.1°C | 9.5°C | 14.6°C | 6.5°C | 80 mm | 83% | 3.9 m/s | 3.5 |
| 2019 | 12.8°C | 10.8°C | 8.9°C | 15.6°C | 6.5°C | 56 mm | 80% | 3.6 m/s | 4.1 |
| 2018 | 12.8°C | 10.8°C | 8.9°C | 14.4°C | 6.6°C | 44 mm | 80% | 4 m/s | 3.9 |
| 2017 | 12.1°C | 10.3°C | 8.5°C | 15.0°C | 5.9°C | 104 mm | 81% | 4.7 m/s | 3.4 |
| 2016 | 13.1°C | 11.4°C | 9.6°C | 15.9°C | 7.1°C | 105 mm | 84% | 3.3 m/s | 3.4 |
| 2015 | 13.0°C | 10.9°C | 8.8°C | 15.1°C | 5.4°C | 27 mm | 82% | 2.8 m/s | 4 |
| 2014 | 13.7°C | 11.8°C | 9.8°C | 16.5°C | 7.3°C | 56 mm | 81% | 3.6 m/s | 3.9 |
| 2013 | 13.2°C | 11.6°C | 10.1°C | 15.0°C | 6.2°C | 116 mm | 84% | 4.2 m/s | 3.4 |
| 2012 | 12.6°C | 10.8°C | 9.1°C | 15.1°C | 6.0°C | 132 mm | 83% | 4.2 m/s | 3.5 |
| 2011 | 13.2°C | 11.2°C | 9.3°C | 15.0°C | 6.0°C | 61 mm | 81% | 3.8 m/s | 3.8 |
| 2010 | 12.5°C | 10.6°C | 8.7°C | 15.5°C | 6.5°C | 131 mm | 80% | 4.8 m/s | 3.7 |
| 2009 | 13.4°C | 11.6°C | 9.8°C | 15.7°C | 8.2°C | 124 mm | 82% | 4.1 m/s | 3.2 |
| 2008 | 12.9°C | 11.0°C | 9.2°C | 15.1°C | 6.4°C | 81 mm | 79% | 4.4 m/s | 3.3 |
| 2007 | 13.0°C | 11.2°C | 9.4°C | 15.6°C | 6.6°C | 90 mm | 81% | 4.1 m/s | 3.5 |
| 2006 | 13.1°C | 11.1°C | 9.2°C | 15.1°C | 6.9°C | 80 mm | 80% | 4.1 m/s | 3.9 |
| 2005 | 13.0°C | 11.3°C | 9.7°C | 15.3°C | 6.6°C | 171 mm | 84% | 3.2 m/s | 3.4 |
| 2004 | 13.1°C | 11.2°C | 9.3°C | 14.7°C | 5.9°C | 59 mm | 83% | 3.7 m/s | 3.7 |
| 2003 | 12.0°C | 10.1°C | 8.1°C | 13.8°C | 6.1°C | 90 mm | 79% | 5.4 m/s | 3.7 |
| 2002 | 12.9°C | 11.0°C | 9.1°C | 15.4°C | 6.6°C | 110 mm | 80% | 5.3 m/s | 3.6 |
| 2001 | 13.8°C | 12.1°C | 10.3°C | 15.6°C | 7.2°C | 95 mm | 83% | 3.6 m/s | 3.7 |
| 2000 | 12.7°C | 11.2°C | 9.6°C | 14.6°C | 7.7°C | 119 mm | 82% | 5.3 m/s | 3.5 |
| 1999 | 13.4°C | 11.7°C | 10.0°C | 15.9°C | 7.5°C | 44 mm | 82% | 3.2 m/s | 3.7 |
| 1998 | 13.0°C | 11.3°C | 9.7°C | 15.2°C | 6.8°C | 144 mm | 83% | 4 m/s | 3.6 |
| 1997 | 12.7°C | 10.8°C | 8.9°C | 15.1°C | 7.0°C | 106 mm | 82% | 3.3 m/s | 3.9 |
| 1996 🌧️ | 11.7°C | 9.8°C | 8.0°C | 13.5°C | 5.9°C | 227 mm | 82% | 4.6 m/s | 3.5 |
| 1995 | 11.8°C | 9.9°C | 7.9°C | 14.2°C | 5.1°C | 62 mm | 81% | 4 m/s | 3.8 |
| 1994 ❄️ | 11.5°C | 9.5°C | 7.4°C | 13.8°C | 4.0°C | 48 mm | 80% | 4.3 m/s | 4 |
| 1993 | 12.7°C | 10.9°C | 9.0°C | 15.0°C | 5.8°C | 59 mm | 81% | 3.2 m/s | 3.9 |
| 1992 | 11.7°C | 9.8°C | 7.9°C | 14.4°C | 5.9°C | 101 mm | 80% | 3.7 m/s | 3.6 |
| 1991 | 12.1°C | 10.1°C | 8.0°C | 14.0°C | 5.1°C | 85 mm | 83% | 3.8 m/s | 3.9 |
| 1990 | 12.6°C | 10.8°C | 9.0°C | 14.4°C | 5.9°C | 84 mm | 81% | 3.4 m/s | 3.7 |
| 1989 | 12.8°C | 10.8°C | 8.8°C | 14.7°C | 6.9°C | 123 mm | 83% | 3.5 m/s | 3.8 |
| 1988 | 13.6°C | 11.9°C | 10.2°C | 15.1°C | 6.9°C | 120 mm | 84% | 4 m/s | 3.6 |
| 1987 | 13.2°C | 11.1°C | 8.9°C | 16.5°C | 6.0°C | 59 mm | 83% | 3.8 m/s | 4.2 |
| 1986 | 12.2°C | 10.4°C | 8.6°C | 13.9°C | 5.9°C | 74 mm | 83% | 4 m/s | 3.6 |
| 1985 | 13.1°C | 10.7°C | 8.3°C | 14.9°C | 6.4°C | 35 mm | 81% | 3.1 m/s | 4.1 |
| 1984 | 12.2°C | 10.4°C | 8.5°C | 14.6°C | 5.9°C | 151 mm | 83% | 3.6 m/s | 3.6 |
| 1983 | 12.4°C | 10.7°C | 9.0°C | 14.1°C | 6.2°C | 107 mm | 81% | 4.6 m/s | — |
| 1982 | 12.9°C | 10.8°C | 8.7°C | 15.5°C | 6.4°C | 68 mm | 79% | 4.1 m/s | — |
| 1981 | 13.2°C | 11.3°C | 9.4°C | 14.7°C | 7.2°C | 35 mm | 83% | 4.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 12.8°C with lows near 9.1°C (mean 11°C), based on 45 years of NASA POWER data.
September averages 90 mm of rainfall in Devonport, a relatively wet time of year. The wettest on record was 227 mm in 1996.
The hottest September reached 16.9°C in 2022. The coldest dipped to 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 0.7°C. Daytime highs moved from 12.8°C to 13.3°C and overnight lows from 8.8°C to 9.6°C over the same span.
September is one of the cooler months of the year in Devonport and a relatively wet time of year, so plan for around 12.8°C daytime highs and 9.1°C at night.
Not quite — September is the 3rd coolest month in Devonport, averaging 11°C.
For September in Devonport, pack light layers you can adjust through the day, with typical highs of 12.8°C and lows of 9.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 81% — quite humid.
Average wind speed in September is 4 m/s. The windiest September on record averaged 5.4 m/s (2003).
The wettest September on record was 1996 with 227 mm. On average, September sees 90 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 Devonport 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.
