September is one of the warmer months of the year in Palmerston, with average highs near 36.7°C and lows around 23.8°C (mean 30.3°C). It is one of the drier months, averaging 18 mm of rainfall and 53% relative humidity across the period.
September is one of the warmer months of the year in Palmerston. Across 45 years of records, the warmest September in Palmerston was 2022 — when the month averaged 31.5°C — while the coldest were 1982 and 2019 at 28.9°C. Typical September days reach 36.7°C with nights near 23.8°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Palmerston, averaging 18 mm of rainfall. The wettest September on record was 1981 with 78 mm, while the driest was 1990 at 0 mm.
Relative humidity in Palmerston during September averages 53%. The most humid September was 2010 at 62%, and the least humid was 1990 at 47%.
September receives about 6.4 kWh/m²/day of solar energy in Palmerston. The sunniest September was 2019 at 6.9 kWh/m²/day, and the cloudiest was 2010 at 5.8.
Average wind speed in Palmerston during September is 2.5 m/s. The windiest Septembers were 2021, 2023 and 2024, among others at 2.9 m/s, while the calmest were 2002 and 2016 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 30.2°C | 30.1°C | 30.2°C | 30.2°C | 30.7°C | +0.5°C |
| Avg High | 36.6°C | 36.6°C | 36.9°C | 36.7°C | 36.9°C | +0.3°C |
| Avg Low | 23.8°C | 23.6°C | 23.6°C | 23.8°C | 24.6°C | +0.8°C |
| Avg Rain | 26 mm | 12 mm | 15 mm | 16 mm | 26 mm | 0 mm |
September temperatures in Palmerston have risen by about 0.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 15.4°C (2004) to a record high of 40°C (1983).
Rainfall in September is one of the drier months, averaging 18 mm, with a wettest year of 78 mm.
A good time to visit Palmerston
September is a good time to visit Palmerston, with days averaging 36.7°C and nights around 23.8°C (mean 30.3°C, warmer than Palmerston's yearly average) and low rainfall. June and July 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 | 36.4°C | 30.1°C | 23.8°C | 38.7°C | 18.9°C | 45 mm | 55% | 2.5 m/s | 6.2 |
| 2024 | 37.0°C | 31.0°C | 25.0°C | 39.6°C | 23.5°C | 23 mm | 56% | 2.9 m/s | 6.2 |
| 2023 | 36.8°C | 30.1°C | 23.4°C | 38.9°C | 20.9°C | 1 mm | 50% | 2.9 m/s | 6.6 |
| 2022 🔥 | 37.1°C | 31.5°C | 25.9°C | 39.0°C | 23.6°C | 44 mm | 57% | 2.1 m/s | 6.2 |
| 2021 | 36.7°C | 30.6°C | 24.5°C | 38.2°C | 19.1°C | 20 mm | 54% | 2.9 m/s | 6.6 |
| 2020 | 37.2°C | 31.0°C | 24.7°C | 38.6°C | 22.3°C | 23 mm | 56% | 2.9 m/s | 6.5 |
| 2019 | 36.0°C | 28.9°C | 21.7°C | 38.3°C | 16.3°C | 2 mm | 52% | 2.8 m/s | 6.9 |
| 2018 | 37.3°C | 30.8°C | 24.4°C | 38.7°C | 22.4°C | 2 mm | 50% | 2.4 m/s | 6.7 |
| 2017 | 37.4°C | 30.7°C | 24.1°C | 38.5°C | 19.8°C | 9 mm | 51% | 2.4 m/s | 6.6 |
| 2016 | 36.2°C | 31.0°C | 25.8°C | 38.0°C | 23.9°C | 43 mm | 61% | 2 m/s | 6.1 |
| 2015 | 36.4°C | 29.9°C | 23.3°C | 38.2°C | 17.9°C | 2 mm | 48% | 2.3 m/s | 6.5 |
| 2014 | 37.0°C | 30.0°C | 22.9°C | 38.8°C | 19.4°C | 1 mm | 50% | 2.2 m/s | 6.6 |
| 2013 | 36.7°C | 30.4°C | 24.1°C | 38.8°C | 19.9°C | 5 mm | 53% | 2.6 m/s | 6.3 |
| 2012 | 37.0°C | 30.2°C | 23.4°C | 38.4°C | 20.3°C | 26 mm | 51% | 2.1 m/s | 6.5 |
| 2011 | 36.3°C | 29.6°C | 22.9°C | 38.6°C | 16.9°C | 3 mm | 50% | 2.5 m/s | 6.4 |
| 2010 | 36.2°C | 30.8°C | 25.4°C | 38.3°C | 24.0°C | 65 mm | 62% | 2.7 m/s | 5.8 |
| 2009 | 37.1°C | 31.0°C | 25.0°C | 38.9°C | 23.2°C | 28 mm | 54% | 2.4 m/s | 6.3 |
| 2008 | 37.7°C | 31.1°C | 24.4°C | 39.2°C | 21.3°C | 11 mm | 51% | 2.2 m/s | 6.4 |
| 2007 | 37.2°C | 30.1°C | 23.0°C | 39.3°C | 18.7°C | 22 mm | 50% | 2.2 m/s | 6.5 |
| 2006 | 36.2°C | 29.0°C | 21.7°C | 38.5°C | 16.7°C | 4 mm | 49% | 2.6 m/s | 6.7 |
| 2005 | 37.0°C | 30.8°C | 24.6°C | 38.8°C | 21.4°C | 11 mm | 53% | 2.3 m/s | 6.2 |
| 2004 | 36.2°C | 29.0°C | 21.8°C | 38.0°C | 15.4°C | 10 mm | 48% | 2.8 m/s | 6.6 |
| 2003 | 36.9°C | 30.7°C | 24.5°C | 38.7°C | 16.7°C | 9 mm | 52% | 2.4 m/s | 6.2 |
| 2002 | 35.6°C | 29.5°C | 23.5°C | 38.2°C | 20.9°C | 41 mm | 58% | 2 m/s | 6.3 |
| 2001 | 37.3°C | 30.5°C | 23.7°C | 39.5°C | 20.0°C | 8 mm | 54% | 2.3 m/s | 6.6 |
| 2000 | 37.4°C | 30.6°C | 23.9°C | 38.5°C | 19.0°C | 3 mm | 52% | 2.5 m/s | 6.3 |
| 1999 | 36.5°C | 29.8°C | 23.0°C | 38.2°C | 20.0°C | 3 mm | 53% | 2.6 m/s | 6.6 |
| 1998 | 37.1°C | 31.1°C | 25.1°C | 38.9°C | 21.3°C | 30 mm | 56% | 2.3 m/s | 6.2 |
| 1997 | 36.3°C | 29.5°C | 22.8°C | 38.7°C | 21.0°C | 9 mm | 54% | 2.7 m/s | 6.7 |
| 1996 | 36.5°C | 29.9°C | 23.3°C | 39.7°C | 17.9°C | 7 mm | 53% | 2.5 m/s | 6.4 |
| 1995 | 37.2°C | 30.8°C | 24.5°C | 39.3°C | 23.2°C | 6 mm | 54% | 2.4 m/s | 6.3 |
| 1994 | 36.3°C | 29.4°C | 22.5°C | 37.8°C | 20.8°C | 3 mm | 51% | 2.4 m/s | 6.4 |
| 1993 | 35.9°C | 29.8°C | 23.8°C | 37.8°C | 22.5°C | 36 mm | 57% | 2.8 m/s | 6.2 |
| 1992 | 36.7°C | 31.0°C | 25.3°C | 38.3°C | 23.3°C | 20 mm | 58% | 2.5 m/s | 6 |
| 1991 | 36.8°C | 30.3°C | 23.7°C | 39.0°C | 22.6°C | 8 mm | 53% | 2.2 m/s | 5.9 |
| 1990 | 36.4°C | 29.1°C | 21.7°C | 37.8°C | 17.0°C | 0 mm | 47% | 2.9 m/s | 6.4 |
| 1989 | 37.7°C | 30.7°C | 23.6°C | 39.7°C | 17.9°C | 2 mm | 50% | 2.3 m/s | 6.4 |
| 1988 | 37.3°C | 31.0°C | 24.8°C | 39.7°C | 18.2°C | 31 mm | 54% | 2.6 m/s | 6.3 |
| 1987 | 36.8°C | 30.2°C | 23.6°C | 38.5°C | 21.0°C | 9 mm | 50% | 2.5 m/s | 6.2 |
| 1986 | 36.8°C | 30.4°C | 24.0°C | 39.4°C | 16.7°C | 29 mm | 52% | 2.6 m/s | 6.1 |
| 1985 | 37.0°C | 30.2°C | 23.3°C | 39.6°C | 18.8°C | 9 mm | 48% | 2.3 m/s | 6.4 |
| 1984 | 35.0°C | 29.3°C | 23.6°C | 38.0°C | 17.1°C | 56 mm | 59% | 2.1 m/s | 6 |
| 1983 | 37.4°C | 30.9°C | 24.4°C | 40.0°C | 20.5°C | 11 mm | 52% | 2.5 m/s | — |
| 1982 ❄️ | 35.3°C | 28.9°C | 22.5°C | 39.6°C | 19.6°C | 11 mm | 53% | 2.4 m/s | — |
| 1981 🌧️ | 36.3°C | 30.5°C | 24.6°C | 38.3°C | 21.5°C | 78 mm | 54% | 2.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 36.7°C with lows near 23.8°C (mean 30.3°C), based on 45 years of NASA POWER data.
September averages 18 mm of rainfall in Palmerston, one of the drier months. The wettest on record was 78 mm in 1981.
The hottest September reached 40°C in 1983. The coldest dipped to 15.4°C in 2004.
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 36.2°C to 36.8°C and overnight lows from 23.7°C to 24.5°C over the same span.
September is one of the warmer months of the year in Palmerston and one of the drier months, so plan for around 36.7°C daytime highs and 23.8°C at night.
Not quite — September is the 10th coolest month in Palmerston, averaging 30.3°C.
For September in Palmerston, pack light, breathable clothing and sun protection, with typical highs of 36.7°C and lows of 23.8°C.
Relative humidity in September averages 53% — relatively dry.
Average wind speed in September is 2.5 m/s. The windiest September on record averaged 2.9 m/s (1981).
The wettest September on record was 1981 with 78 mm. On average, September sees 18 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 Palmerston 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.
