September is one of the cooler months of the year in Christchurch, with average highs near 14.1°C and lows around 4.2°C (mean 9.2°C). It is about average for rainfall, averaging 66 mm of rainfall and 82% relative humidity across the period.
September is one of the cooler months of the year in Christchurch. Across 45 years of records, the warmest September in Christchurch was 1988 — when the month averaged 10.8°C — while the coldest was 1992 at 6.4°C. Typical September days reach 14.1°C with nights near 4.2°C. The long-term September temperature trend is broadly flat.
September is about average for rainfall in Christchurch, averaging 66 mm of rainfall. The wettest September on record was 1995 with 236 mm, while the driest was 2001 at 23 mm.
Relative humidity in Christchurch during September averages 82%. The most humid September was 1992 at 89%, and the least humid was 2002 at 74%.
September receives about 3.7 kWh/m²/day of solar energy in Christchurch. The sunniest Septembers were 1985 and 2025 at 4.3 kWh/m²/day, and the cloudiest were 1995 and 2005 at 3.1.
Average wind speed in Christchurch during September is 2.8 m/s. The windiest September was 2002 at 3.4 m/s, while the calmest was 1986 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.4°C | 8.6°C | 9.5°C | 9.0°C | 9.5°C | +0.1°C |
| Avg High | 14.2°C | 13.4°C | 14.6°C | 13.7°C | 14.4°C | +0.2°C |
| Avg Low | 4.5°C | 3.8°C | 4.4°C | 4.3°C | 4.4°C | -0.1°C |
| Avg Rain | 70 mm | 76 mm | 53 mm | 62 mm | 74 mm | +4 mm |
September temperatures in Christchurch have risen by about 0.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.5°C (1997) to a record high of 22.5°C (2002).
Rainfall in September is about average for rainfall, averaging 66 mm, with a wettest year of 236 mm.
A quieter season to visit Christchurch
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Christchurch. That said, September — with days averaging 14.1°C and nights around 4.2°C (mean 9.2°C) and moderate rainfall (66 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 | 14.8°C | 9.4°C | 4.0°C | 18.2°C | -0.5°C | 69 mm | 80% | 3.1 m/s | 4.3 |
| 2024 | 14.7°C | 9.6°C | 4.4°C | 18.6°C | -1.6°C | 86 mm | 81% | 2.8 m/s | 4 |
| 2023 | 14.4°C | 10.0°C | 5.6°C | 19.0°C | 1.8°C | 92 mm | 83% | 3.3 m/s | 3.5 |
| 2022 | 13.9°C | 9.4°C | 4.8°C | 20.7°C | -0.6°C | 53 mm | 85% | 2.4 m/s | 3.5 |
| 2021 | 13.7°C | 8.7°C | 3.7°C | 18.0°C | -1.0°C | 71 mm | 82% | 3 m/s | 3.9 |
| 2020 | 15.2°C | 9.6°C | 4.0°C | 21.4°C | 0.1°C | 71 mm | 79% | 3.2 m/s | 4.2 |
| 2019 | 13.7°C | 8.9°C | 4.0°C | 19.5°C | 0.5°C | 66 mm | 84% | 2.8 m/s | 3.7 |
| 2018 | 13.8°C | 9.1°C | 4.3°C | 19.9°C | 2.0°C | 45 mm | 84% | 2.4 m/s | 4 |
| 2017 | 13.9°C | 9.6°C | 5.4°C | 21.1°C | 2.3°C | 102 mm | 87% | 3 m/s | 3.3 |
| 2016 | 13.7°C | 9.6°C | 5.4°C | 18.7°C | 0.4°C | 58 mm | 87% | 2.8 m/s | 3.3 |
| 2015 | 12.4°C | 7.9°C | 3.5°C | 20.3°C | 0.4°C | 67 mm | 84% | 2.7 m/s | 3.7 |
| 2014 | 14.3°C | 9.1°C | 3.9°C | 20.5°C | 0.2°C | 51 mm | 84% | 2.5 m/s | 3.9 |
| 2013 | 13.9°C | 9.3°C | 4.8°C | 18.7°C | -0.6°C | 57 mm | 82% | 2.8 m/s | 3.7 |
| 2012 | 14.2°C | 9.2°C | 4.2°C | 19.4°C | -0.5°C | 61 mm | 82% | 3 m/s | 3.7 |
| 2011 | 13.8°C | 8.6°C | 3.3°C | 18.6°C | -0.3°C | 34 mm | 79% | 2.5 m/s | 3.9 |
| 2010 | 13.7°C | 9.0°C | 4.4°C | 18.9°C | -0.7°C | 82 mm | 82% | 3.3 m/s | 3.6 |
| 2009 | 14.3°C | 9.0°C | 3.7°C | 19.7°C | -1.5°C | 46 mm | 79% | 2.8 m/s | 3.8 |
| 2008 | 14.7°C | 9.6°C | 4.4°C | 20.8°C | -0.6°C | 49 mm | 84% | 2.7 m/s | 3.5 |
| 2007 | 14.3°C | 9.3°C | 4.4°C | 19.6°C | -2.1°C | 47 mm | 81% | 2.5 m/s | 3.6 |
| 2006 | 15.6°C | 10.0°C | 4.5°C | 20.0°C | 0.7°C | 26 mm | 82% | 2.7 m/s | 3.6 |
| 2005 | 14.9°C | 10.1°C | 5.3°C | 19.2°C | 0.6°C | 59 mm | 82% | 2.5 m/s | 3.1 |
| 2004 | 13.9°C | 8.6°C | 3.2°C | 20.2°C | -1.3°C | 50 mm | 81% | 2.9 m/s | 3.7 |
| 2003 | 13.6°C | 8.8°C | 4.1°C | 18.6°C | 0.0°C | 104 mm | 80% | 3.2 m/s | 3.6 |
| 2002 | 15.9°C | 10.4°C | 4.9°C | 22.5°C | 1.2°C | 53 mm | 74% | 3.4 m/s | 3.8 |
| 2001 | 15.7°C | 10.0°C | 4.4°C | 21.5°C | 0.3°C | 23 mm | 79% | 2.5 m/s | 3.6 |
| 2000 | 13.5°C | 9.1°C | 4.7°C | 21.1°C | -0.3°C | 69 mm | 83% | 2.9 m/s | 3.3 |
| 1999 | 15.3°C | 9.7°C | 4.1°C | 22.2°C | -2.0°C | 33 mm | 81% | 2.5 m/s | 3.6 |
| 1998 | 15.6°C | 9.9°C | 4.2°C | 21.4°C | 0.1°C | 31 mm | 77% | 2.9 m/s | 3.8 |
| 1997 | 12.1°C | 7.5°C | 2.9°C | 19.1°C | -2.5°C | 23 mm | 83% | 2.4 m/s | 3.6 |
| 1996 | 15.3°C | 10.3°C | 5.3°C | 22.2°C | 0.2°C | 45 mm | 83% | 2.7 m/s | 3.7 |
| 1995 🌧️ | 13.0°C | 8.4°C | 3.8°C | 17.4°C | -1.6°C | 236 mm | 86% | 2.8 m/s | 3.1 |
| 1994 | 12.1°C | 7.6°C | 3.1°C | 17.4°C | -0.3°C | 86 mm | 83% | 3.1 m/s | 3.5 |
| 1993 | 12.3°C | 7.7°C | 3.2°C | 18.3°C | -2.0°C | 104 mm | 83% | 3 m/s | 3.6 |
| 1992 ❄️ | 10.3°C | 6.4°C | 2.6°C | 16.2°C | -1.3°C | 75 mm | 89% | 2.5 m/s | 3.2 |
| 1991 | 13.9°C | 9.4°C | 4.9°C | 17.5°C | 1.6°C | 69 mm | 85% | 2.5 m/s | 3.6 |
| 1990 | 13.7°C | 8.6°C | 3.4°C | 19.2°C | 1.0°C | 56 mm | 83% | 2.5 m/s | 3.7 |
| 1989 | 14.5°C | 10.0°C | 5.4°C | 21.3°C | -1.2°C | 64 mm | 85% | 2.4 m/s | 3.8 |
| 1988 🔥 | 16.0°C | 10.8°C | 5.6°C | 20.3°C | -0.2°C | 68 mm | 81% | 2.4 m/s | 3.7 |
| 1987 | 14.3°C | 9.4°C | 4.6°C | 19.0°C | 0.3°C | 59 mm | 82% | 3.1 m/s | 3.6 |
| 1986 | 13.3°C | 8.5°C | 3.7°C | 19.6°C | 0.8°C | 88 mm | 83% | 2.2 m/s | 3.8 |
| 1985 | 14.5°C | 9.5°C | 4.6°C | 18.9°C | 1.0°C | 59 mm | 82% | 2.9 m/s | 4.3 |
| 1984 | 13.9°C | 9.2°C | 4.6°C | 18.8°C | 1.8°C | 48 mm | 85% | 2.5 m/s | 3.9 |
| 1983 | 13.4°C | 8.9°C | 4.3°C | 20.0°C | 1.5°C | 126 mm | 84% | 3.1 m/s | — |
| 1982 | 14.5°C | 9.3°C | 4.1°C | 20.9°C | 0.2°C | 57 mm | 80% | 2.4 m/s | — |
| 1981 | 13.8°C | 8.6°C | 3.4°C | 17.2°C | -1.6°C | 57 mm | 80% | 3.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 14.1°C with lows near 4.2°C (mean 9.2°C), based on 45 years of NASA POWER data.
September averages 66 mm of rainfall in Christchurch, about average for rainfall. The wettest on record was 236 mm in 1995.
The hottest September reached 22.5°C in 2002. The coldest dipped to -2.5°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 14°C to 14.3°C and overnight lows from 4.2°C to 4.5°C over the same span.
September is one of the cooler months of the year in Christchurch and about average for rainfall, so plan for around 14.1°C daytime highs and 4.2°C at night.
Not quite — September is the 4th coolest month in Christchurch, averaging 9.2°C.
For September in Christchurch, pack warm layers and a jacket for chilly mornings, with typical highs of 14.1°C and lows of 4.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 82% — quite humid.
Average wind speed in September is 2.8 m/s. The windiest September on record averaged 3.4 m/s (2002).
The wettest September on record was 1995 with 236 mm. On average, September sees 66 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 Christchurch 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.
