Weather in Christchurch in September 2025
Average weather
Average temperature in Christchurch in September
Going from a maximum of +22°C during the day to a minimum of +1°C during the night, the temperature in September averages around +17°C.
The average maximum temperature goes down 14% by the end of the month, compared with the beginning of the month, from +19°C to +16°C.
Is Christchurch warm or cold in September?
Christchurch is typically mild in September.
Maximum temperatures go up compared to the previous month from +12°C to +15°C. The minimum temperature also goes up from +5°C to +6°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Christchurch:
Water temperature in Christchurch in September
Water in Christchurch in September is Cold. It varies from +9°C to +11°C, with an average of +10°C. This is almost similar to the air temperature, which averages +15°C.
The water temperature in September is one of the coldest of the entire year:
Can you swim in Christchurch in September?
Climate in Christchurch in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +12°C | +15°C | +17°C | ||||
| Min. temperature | ||||||
| -5°C | -4°C | -3°C | ||||
| Max. temperature | ||||||
| +22°C | +25°C | +28°C | ||||
| Rainfall | ||||||
| 56 mm | 47 mm | 56 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +10°C | +10°C | +11°C | ||||
| Humidity | ||||||
| 79% | 75% | 72% | ||||
| Air pressure | ||||||
| 1011 HPa | 1010 HPa | 1009 HPa | ||||
| Sunny days | ||||||
| 5 | 5 | 4 | ||||
| Cloudy days | ||||||
| 10 | 10 | 11 | ||||
| Rainy days | ||||||
| 15 | 14 | 16 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +12°C to +15°C during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 56 mm to 47 mm. It feels drier, as humidity decreases from 79% to 75%. The average wind speed doesn’t change much during September, staying around 3 m/s. The amount of sunny days stay about the same, averaging 5 sunny days during the month.
But maybe it is worth considering traveling in October as the weather gets better.
Wind
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Christchurch is gradually increasing during September, going from 2 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Christchurch?
Climate Change over Years
The climate in Christchurch in September has not changed much over the last 43 years.
The average temperature was the lowest in 1992 (+15°C) and the highest in 2019 (+18°C). The driest year was 1988 with only 348 mm of rainfall, and the wettest year was 2021 with 963 mm.
FAQ
Is September a good time to visit Christchurch?
Can you sunbathe in Christchurch in September?
Can you swim in Christchurch in September?
Is Christchurch rainy in September?
Is it sunny in Christchurch in September?
Other cities in New Zealand
Monthly weather in Christchurch
Source of the data
For this page, we’ve looked at the typical weather in Christchurch, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.