September is one of the cooler months of the year in Waitangi, with average highs near 11°C and lows around 8.9°C (mean 10°C). It is about average for rainfall, averaging 65 mm of rainfall and 84% relative humidity across the period.
September is one of the cooler months of the year in Waitangi. Across 45 years of records, the warmest Septembers in Waitangi were 2017 and 2023 — when the month averaged 11.4°C — while the coldest was 1992 at 8.5°C. Typical September days reach 11°C with nights near 8.9°C. The long-term trend is warming, about 0.2°C per decade.
September is about average for rainfall in Waitangi, averaging 65 mm of rainfall. The wettest September on record was 2003 with 123 mm, while the driest was 1982 at 32 mm.
Relative humidity in Waitangi during September averages 84%. The most humid September was 1996 at 88%, and the least humid were 1985 and 1987 at 80%.
September receives about 3.3 kWh/m²/day of solar energy in Waitangi. The sunniest Septembers were 2002 and 2006 at 3.7 kWh/m²/day, and the cloudiest were 2003, 2007 and 2013, among others at 3.
Average wind speed in Waitangi during September is 7.1 m/s. The windiest September was 2010 at 8.3 m/s, while the calmest was 1991 at 5.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.8°C | 9.5°C | 10.0°C | 10.1°C | 10.3°C | +0.5°C |
| Avg High | 10.8°C | 10.5°C | 11.2°C | 11.1°C | 11.5°C | +0.7°C |
| Avg Low | 8.8°C | 8.4°C | 8.9°C | 9.1°C | 9.1°C | +0.3°C |
| Avg Rain | 59 mm | 69 mm | 64 mm | 65 mm | 68 mm | +9 mm |
September temperatures in Waitangi have risen by about 0.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.1°C (1994) to a record high of 14.3°C (2020).
Rainfall in September is about average for rainfall, averaging 65 mm, with a wettest year of 123 mm.
A quieter season to visit Waitangi
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Waitangi. That said, September — with days averaging 11°C and nights around 8.9°C (mean 10°C) and moderate rainfall (65 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 | 11.5°C | 10.1°C | 8.8°C | 13.8°C | 6.4°C | 110 mm | 83% | 8.1 m/s | 3.5 |
| 2024 | 11.2°C | 10.0°C | 8.7°C | 13.2°C | 6.5°C | 56 mm | 84% | 7.3 m/s | 3.6 |
| 2023 | 12.4°C | 11.4°C | 10.4°C | 14.0°C | 8.2°C | 57 mm | 86% | 7.6 m/s | 3.4 |
| 2022 | 11.1°C | 10.1°C | 9.1°C | 13.2°C | 6.8°C | 64 mm | 81% | 7 m/s | 3.3 |
| 2021 | 11.2°C | 10.0°C | 8.8°C | 13.4°C | 6.8°C | 59 mm | 84% | 7.2 m/s | 3.3 |
| 2020 | 11.4°C | 10.2°C | 9.0°C | 14.3°C | 5.5°C | 63 mm | 83% | 7.7 m/s | 3.4 |
| 2019 | 10.9°C | 9.9°C | 8.8°C | 12.9°C | 6.4°C | 72 mm | 83% | 7.8 m/s | 3.5 |
| 2018 | 11.6°C | 10.7°C | 9.8°C | 13.7°C | 7.5°C | 56 mm | 85% | 7.7 m/s | 3.3 |
| 2017 🔥 | 12.1°C | 11.4°C | 10.6°C | 14.2°C | 8.4°C | 83 mm | 86% | 6.6 m/s | 3.3 |
| 2016 | 10.9°C | 10.1°C | 9.4°C | 12.6°C | 7.3°C | 83 mm | 87% | 6 m/s | 3.1 |
| 2015 | 9.9°C | 8.7°C | 7.5°C | 12.2°C | 5.2°C | 50 mm | 85% | 7.3 m/s | 3.3 |
| 2014 | 10.8°C | 9.8°C | 8.8°C | 12.6°C | 6.0°C | 59 mm | 82% | 6.9 m/s | 3.3 |
| 2013 | 11.4°C | 10.4°C | 9.4°C | 13.9°C | 6.4°C | 78 mm | 85% | 7 m/s | 3 |
| 2012 | 11.0°C | 10.0°C | 9.1°C | 13.4°C | 5.9°C | 40 mm | 85% | 7.1 m/s | 3.5 |
| 2011 | 10.4°C | 9.3°C | 8.3°C | 12.3°C | 5.5°C | 57 mm | 82% | 7.6 m/s | 3.5 |
| 2010 | 11.7°C | 10.5°C | 9.2°C | 13.3°C | 6.8°C | 74 mm | 83% | 8.3 m/s | 3.5 |
| 2009 | 10.4°C | 9.3°C | 8.2°C | 12.4°C | 6.3°C | 82 mm | 85% | 6.2 m/s | 3.3 |
| 2008 | 11.3°C | 10.3°C | 9.4°C | 12.9°C | 7.9°C | 80 mm | 86% | 6.6 m/s | 3.2 |
| 2007 | 10.8°C | 9.8°C | 8.7°C | 13.0°C | 5.9°C | 42 mm | 84% | 6.7 m/s | 3 |
| 2006 | 11.4°C | 10.2°C | 9.0°C | 13.2°C | 7.1°C | 38 mm | 84% | 6.8 m/s | 3.7 |
| 2005 | 11.4°C | 10.3°C | 9.1°C | 14.0°C | 5.5°C | 48 mm | 85% | 6.7 m/s | 3.3 |
| 2004 | 10.5°C | 9.3°C | 8.1°C | 12.2°C | 6.0°C | 58 mm | 81% | 8.2 m/s | 3.2 |
| 2003 🌧️ | 11.9°C | 10.7°C | 9.4°C | 13.5°C | 6.8°C | 123 mm | 85% | 7.6 m/s | 3 |
| 2002 | 11.8°C | 10.4°C | 9.1°C | 13.3°C | 6.5°C | 60 mm | 84% | 7.9 m/s | 3.7 |
| 2001 | 11.2°C | 10.0°C | 8.7°C | 13.9°C | 6.1°C | 48 mm | 82% | 6.4 m/s | 3.6 |
| 2000 | 11.3°C | 10.2°C | 9.2°C | 13.5°C | 6.6°C | 61 mm | 83% | 7.2 m/s | 3.4 |
| 1999 | 11.6°C | 10.5°C | 9.4°C | 13.2°C | 6.7°C | 92 mm | 86% | 7.1 m/s | 3.2 |
| 1998 | 11.0°C | 9.7°C | 8.4°C | 12.7°C | 6.0°C | 74 mm | 84% | 8.2 m/s | 3.3 |
| 1997 | 9.9°C | 8.7°C | 7.5°C | 12.7°C | 4.8°C | 56 mm | 80% | 6.9 m/s | 3.3 |
| 1996 | 11.4°C | 10.6°C | 9.7°C | 13.0°C | 6.6°C | 67 mm | 88% | 5.9 m/s | 3 |
| 1995 | 10.5°C | 9.4°C | 8.3°C | 13.2°C | 6.0°C | 43 mm | 85% | 6.2 m/s | 3.4 |
| 1994 | 9.8°C | 8.8°C | 7.8°C | 11.7°C | 4.1°C | 80 mm | 82% | 7.9 m/s | 3.4 |
| 1993 | 9.7°C | 8.7°C | 7.7°C | 11.9°C | 6.1°C | 86 mm | 81% | 7.6 m/s | 3.2 |
| 1992 ❄️ | 9.4°C | 8.5°C | 7.6°C | 11.1°C | 5.6°C | 58 mm | 83% | 7 m/s | 3.1 |
| 1991 | 11.0°C | 10.2°C | 9.3°C | 12.4°C | 7.3°C | 90 mm | 86% | 5.8 m/s | 3.2 |
| 1990 | 10.6°C | 9.6°C | 8.5°C | 12.8°C | 5.7°C | 44 mm | 82% | 6.3 m/s | 3.4 |
| 1989 | 10.8°C | 10.1°C | 9.3°C | 13.2°C | 6.7°C | 37 mm | 82% | 6.5 m/s | 3.1 |
| 1988 | 11.2°C | 10.0°C | 8.9°C | 12.8°C | 7.0°C | 63 mm | 88% | 6 m/s | 3.1 |
| 1987 | 10.6°C | 9.5°C | 8.3°C | 12.6°C | 6.3°C | 42 mm | 80% | 7.7 m/s | 3.4 |
| 1986 | 10.5°C | 9.6°C | 8.6°C | 12.1°C | 7.0°C | 78 mm | 81% | 7.4 m/s | 3.4 |
| 1985 | 11.1°C | 10.1°C | 9.1°C | 13.0°C | 7.1°C | 44 mm | 80% | 6.8 m/s | 3.6 |
| 1984 | 10.8°C | 10.1°C | 9.3°C | 12.5°C | 7.1°C | 90 mm | 84% | 6.5 m/s | 3.1 |
| 1983 | 10.9°C | 10.0°C | 9.0°C | 13.0°C | 6.7°C | 70 mm | 85% | 6.6 m/s | — |
| 1982 | 10.2°C | 9.3°C | 8.3°C | 12.2°C | 6.6°C | 32 mm | 81% | 6.7 m/s | — |
| 1981 | 10.8°C | 9.8°C | 8.7°C | 12.2°C | 7.1°C | 76 mm | 82% | 7.6 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 8.9°C (mean 10°C), based on 45 years of NASA POWER data.
September averages 65 mm of rainfall in Waitangi, about average for rainfall. The wettest on record was 123 mm in 2003.
The hottest September reached 14.3°C in 2020. The coldest dipped to 4.1°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.4°C. Daytime highs moved from 10.8°C to 11.5°C and overnight lows from 8.9°C to 9.2°C over the same span.
September is one of the cooler months of the year in Waitangi and about average for rainfall, so plan for around 11°C daytime highs and 8.9°C at night.
Not quite — September is the 3rd coolest month in Waitangi, averaging 10°C.
For September in Waitangi, pack light layers you can adjust through the day, with typical highs of 11°C and lows of 8.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 7.1 m/s. The windiest September on record averaged 8.3 m/s (2010).
The wettest September on record was 2003 with 123 mm. On average, September sees 65 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 Waitangi 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.
