Climate averages 1991–2020
Christchurch weather
in September.
A cool, moderately wet month: the 9th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cool month in Christchurch: daytime highs average 13.4°C and nights cool to about 4.8°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 43 mm of rain on roughly 8 days, which makes September a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 45 min on an average September day.
The nearest other city in this atlas is Wellington (305 km away). In September its highs average 12.3°C, 1.1°C cooler than Christchurch, with 74 mm of rain.
Among the 11 cities listed in New Zealand, Christchurch ranks joint 7th of 11 for the warmest September highs and 1st of 11 for the driest September (rainfall, lowest first). The mean September high of those 11 cities is 13.8°C; Christchurch is 0.4°C cooler than that mean.
From September to October, average highs rise by 2.0°C to 15.5°C, and monthly rainfall rises from 43 mm to 48 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Christchurch climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.2°C12.4°C | 12.4°C | 50 | 8.3 | 15.015 h |
| February | 21.2°C12.5°C | 12.5°C | 39 | 6.8 | 13.914 h |
| March | 19.3°C10.7°C | 10.7°C | 45 | 6.9 | 12.412 h |
| April | 16.3°C8.2°C | 8.2°C | 52 | 8.8 | 10.911 h |
| May | 13.5°C5.8°C | 5.8°C | 48 | 8.1 | 9.710 h |
| June | 10.5°C3.0°C | 3.0°C | 57 | 8.8 | 9.09 h |
| July | 9.9°C2.1°C | 2.1°C | 52 | 8.5 | 9.39 h |
| August | 11.2°C3.1°C | 3.1°C | 48 | 8.9 | 10.410 h |
| September, selected | 13.4°C4.8°C | 4.8°C | 43 | 8.1 | 11.812 h |
| October | 15.5°C6.6°C | 6.6°C | 48 | 9.6 | 13.313 h |
| November | 17.3°C8.5°C | 8.5°C | 49 | 9.0 | 14.615 h |
| December | 19.6°C11.0°C | 11.0°C | 53 | 9.3 | 15.315 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Wellington in SeptemberNew Zealand · 305 kmHigh 12.3°C · Low 9.4°C · 74 mm rain
- Dunedin in SeptemberNew Zealand · 310 kmHigh 11.6°C · Low 4.4°C · 50 mm rain
- Lower Hutt in SeptemberNew Zealand · 319 kmHigh 13.0°C · Low 8.8°C · 76 mm rain
- Palmerston North in SeptemberNew Zealand · 431 kmHigh 13.5°C · Low 6.5°C · 94 mm rain
- New Plymouth in SeptemberNew Zealand · 511 kmHigh 13.4°C · Low 8.3°C · 173 mm rain
- Hastings, New Zealand in SeptemberNew Zealand · 557 kmHigh 14.9°C · Low 6.9°C · 60 mm rain
- Hamilton, New Zealand in SeptemberNew Zealand · 677 kmHigh 14.8°C · Low 7.1°C · 114 mm rain
- Tauranga in SeptemberNew Zealand · 715 kmHigh 14.8°C · Low 8.8°C · 112 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Christchurch) is explained once on the Christchurch year overview and on the Sources, method and limits page.