September is one of the cooler months of the year in Napier, with average highs near 15.5°C and lows around 7.7°C (mean 11.6°C). It is about average for rainfall, averaging 75 mm of rainfall and 79% relative humidity across the period.
September is one of the cooler months of the year in Napier. Across 45 years of records, the warmest September in Napier was 1988 — when the month averaged 13°C — while the coldest was 1993 at 9.7°C. Typical September days reach 15.5°C with nights near 7.7°C. The long-term trend is warming, about 0.2°C per decade.
September is about average for rainfall in Napier, averaging 75 mm of rainfall. The wettest September on record was 2022 with 181 mm, while the driest was 1998 at 17 mm.
Relative humidity in Napier during September averages 79%. The most humid September was 2016 at 83%, and the least humid was 2002 at 74%.
September receives about 3.8 kWh/m²/day of solar energy in Napier. The sunniest September was 2011 at 4.4 kWh/m²/day, and the cloudiest was 2016 at 3.1.
Average wind speed in Napier during September is 2.9 m/s. The windiest September was 1981 at 3.6 m/s, while the calmest were 1991, 1995 and 2009, among others at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.5°C | 11.0°C | 11.9°C | 11.5°C | 12.0°C | +0.5°C |
| Avg High | 15.4°C | 15.0°C | 16.0°C | 15.2°C | 16.0°C | +0.6°C |
| Avg Low | 7.7°C | 7.1°C | 7.8°C | 7.8°C | 7.9°C | +0.2°C |
| Avg Rain | 89 mm | 52 mm | 61 mm | 86 mm | 94 mm | +5 mm |
September temperatures in Napier have risen by about 0.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 2°C (1992) to a record high of 24.3°C (2023).
Rainfall in September is about average for rainfall, averaging 75 mm, with a wettest year of 181 mm.
A quieter season to visit Napier
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Napier. That said, September — with days averaging 15.5°C and nights around 7.7°C (mean 11.6°C) and moderate rainfall (75 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 | 16.1°C | 11.9°C | 7.7°C | 20.8°C | 3.7°C | 50 mm | 76% | 3.2 m/s | 3.6 |
| 2024 | 16.5°C | 12.2°C | 7.8°C | 20.1°C | 3.4°C | 49 mm | 76% | 2.7 m/s | 4 |
| 2023 | 16.9°C | 12.7°C | 8.6°C | 24.3°C | 4.7°C | 121 mm | 79% | 3.1 m/s | 3.9 |
| 2022 🌧️ | 15.1°C | 11.8°C | 8.5°C | 19.7°C | 2.8°C | 181 mm | 81% | 2.8 m/s | 3.5 |
| 2021 | 15.3°C | 11.3°C | 7.3°C | 20.1°C | 3.9°C | 108 mm | 78% | 3.1 m/s | 3.7 |
| 2020 | 16.1°C | 11.9°C | 7.6°C | 20.5°C | 4.7°C | 54 mm | 75% | 3.2 m/s | 4.1 |
| 2019 | 15.4°C | 11.5°C | 7.7°C | 20.4°C | 4.3°C | 67 mm | 78% | 3.1 m/s | 3.8 |
| 2018 | 15.3°C | 11.7°C | 8.0°C | 21.5°C | 3.2°C | 119 mm | 81% | 3 m/s | 3.9 |
| 2017 | 15.6°C | 11.9°C | 8.3°C | 20.9°C | 4.4°C | 74 mm | 80% | 2.9 m/s | 3.6 |
| 2016 | 14.9°C | 11.8°C | 8.7°C | 19.3°C | 5.1°C | 78 mm | 83% | 3 m/s | 3.1 |
| 2015 | 14.0°C | 10.3°C | 6.6°C | 18.6°C | 3.0°C | 169 mm | 80% | 3 m/s | 3.5 |
| 2014 | 15.2°C | 11.6°C | 8.1°C | 20.3°C | 4.0°C | 102 mm | 81% | 3 m/s | 3.5 |
| 2013 | 15.9°C | 12.2°C | 8.6°C | 21.2°C | 3.6°C | 80 mm | 79% | 3.2 m/s | 3.7 |
| 2012 | 15.2°C | 11.4°C | 7.7°C | 22.6°C | 3.7°C | 41 mm | 77% | 3.2 m/s | 3.8 |
| 2011 | 14.9°C | 10.6°C | 6.2°C | 18.6°C | 2.7°C | 33 mm | 77% | 2.7 m/s | 4.4 |
| 2010 | 15.6°C | 11.7°C | 7.9°C | 21.1°C | 4.0°C | 98 mm | 79% | 3.5 m/s | 3.4 |
| 2009 | 16.0°C | 11.8°C | 7.7°C | 21.5°C | 3.5°C | 70 mm | 79% | 2.4 m/s | 3.8 |
| 2008 | 16.2°C | 11.9°C | 7.6°C | 21.1°C | 5.1°C | 33 mm | 79% | 2.5 m/s | 4.1 |
| 2007 | 15.6°C | 11.6°C | 7.6°C | 21.3°C | 4.0°C | 63 mm | 80% | 2.7 m/s | 3.8 |
| 2006 | 17.1°C | 12.7°C | 8.3°C | 21.7°C | 4.7°C | 46 mm | 77% | 2.5 m/s | 4.2 |
| 2005 | 17.1°C | 12.8°C | 8.4°C | 21.5°C | 3.4°C | 49 mm | 78% | 2.5 m/s | 4.1 |
| 2004 | 14.7°C | 10.5°C | 6.2°C | 18.9°C | 2.4°C | 42 mm | 77% | 3.1 m/s | 3.8 |
| 2003 | 15.7°C | 12.2°C | 8.7°C | 20.6°C | 5.4°C | 160 mm | 80% | 3.1 m/s | 3.5 |
| 2002 | 16.8°C | 12.3°C | 7.9°C | 20.7°C | 3.8°C | 53 mm | 74% | 3.1 m/s | 3.9 |
| 2001 | 15.8°C | 12.0°C | 8.2°C | 20.9°C | 5.4°C | 31 mm | 77% | 2.6 m/s | 3.8 |
| 2000 | 15.5°C | 11.6°C | 7.7°C | 20.0°C | 3.7°C | 67 mm | 77% | 3.1 m/s | 3.7 |
| 1999 | 16.3°C | 12.0°C | 7.7°C | 20.1°C | 4.5°C | 37 mm | 77% | 2.7 m/s | 4 |
| 1998 | 17.0°C | 12.3°C | 7.7°C | 21.0°C | 3.6°C | 17 mm | 75% | 2.5 m/s | 4.1 |
| 1997 | 13.6°C | 10.3°C | 7.1°C | 18.8°C | 3.3°C | 69 mm | 81% | 3 m/s | 3.6 |
| 1996 | 15.9°C | 12.0°C | 8.2°C | 20.6°C | 2.1°C | 42 mm | 81% | 2.6 m/s | 3.8 |
| 1995 | 15.9°C | 11.7°C | 7.6°C | 20.7°C | 2.6°C | 56 mm | 79% | 2.4 m/s | 3.7 |
| 1994 | 14.4°C | 10.2°C | 6.1°C | 18.5°C | 2.0°C | 56 mm | 79% | 2.9 m/s | 3.6 |
| 1993 ❄️ | 13.3°C | 9.7°C | 6.2°C | 16.5°C | 2.7°C | 53 mm | 78% | 3.4 m/s | 3.7 |
| 1992 | 13.4°C | 9.8°C | 6.2°C | 17.2°C | 2.0°C | 39 mm | 81% | 3 m/s | 3.6 |
| 1991 | 15.4°C | 11.5°C | 7.6°C | 17.6°C | 4.4°C | 47 mm | 79% | 2.4 m/s | 3.7 |
| 1990 | 14.6°C | 10.8°C | 7.0°C | 18.9°C | 4.0°C | 103 mm | 78% | 2.7 m/s | 4.1 |
| 1989 | 14.9°C | 11.8°C | 8.7°C | 20.1°C | 3.1°C | 96 mm | 83% | 2.9 m/s | 3.8 |
| 1988 🔥 | 17.1°C | 13.0°C | 9.0°C | 23.3°C | 4.0°C | 147 mm | 80% | 2.6 m/s | 3.6 |
| 1987 | 15.7°C | 11.6°C | 7.6°C | 19.5°C | 5.2°C | 39 mm | 77% | 3.4 m/s | 3.8 |
| 1986 | 14.7°C | 11.0°C | 7.3°C | 20.7°C | 3.3°C | 155 mm | 81% | 3 m/s | 3.8 |
| 1985 | 15.0°C | 11.2°C | 7.4°C | 19.0°C | 4.3°C | 142 mm | 79% | 3.1 m/s | 4.2 |
| 1984 | 14.2°C | 11.0°C | 7.9°C | 19.3°C | 5.0°C | 112 mm | 82% | 3.1 m/s | 3.8 |
| 1983 | 16.8°C | 12.2°C | 7.7°C | 20.2°C | 3.8°C | 31 mm | 75% | 2.9 m/s | — |
| 1982 | 14.6°C | 10.7°C | 6.8°C | 20.1°C | 2.3°C | 53 mm | 80% | 2.4 m/s | — |
| 1981 | 15.5°C | 11.4°C | 7.2°C | 18.4°C | 3.7°C | 29 mm | 76% | 3.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.5°C with lows near 7.7°C (mean 11.6°C), based on 45 years of NASA POWER data.
September averages 75 mm of rainfall in Napier, about average for rainfall. The wettest on record was 181 mm in 2022.
The hottest September reached 24.3°C in 2023. The coldest dipped to 2°C in 1992.
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 15.2°C to 16°C and overnight lows from 7.4°C to 8°C over the same span.
September is one of the cooler months of the year in Napier and about average for rainfall, so plan for around 15.5°C daytime highs and 7.7°C at night.
Not quite — September is the 4th coolest month in Napier, averaging 11.6°C.
For September in Napier, pack warm layers and a jacket for chilly mornings, with typical highs of 15.5°C and lows of 7.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 79% — quite humid.
Average wind speed in September is 2.9 m/s. The windiest September on record averaged 3.6 m/s (1981).
The wettest September on record was 2022 with 181 mm. On average, September sees 75 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 Napier 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.
