South Island - New Zealand weather in September 2025
South Island - New Zealand weather in September 2025
Day
14 °C
Night
4 °C
Sea
12 °C
Precipitation
71 mm
in month
Rainy days
11 days
in month
Daylight
12 hours
average
Sunshine
5 hours
average
Humidity
75 %
Day
14 °C
Night
4 °C
Sea
12 °C
Precipitation
71 mm
in month
Rainy days
11 days
in month
Daylight
12 hours
average
Sunshine
5 hours
average
Humidity
75 %
Overview: South Island - New Zealand
Travel information
Flights
to
Activities
in Christchurch
Weather charts for South Island - New Zealand
Data backed by 40 years of history
We make the most from 40 years of historical weather data to predict the best weather conditions.
Selection of world's favourite destinations
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
16 500 000 weather records
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.
Find more destinations like this
Activities in South Island - New Zealand
Flights to South Island - New Zealand
Destinations in South Island - New Zealand
Destinations with similar weather to South Island - New Zealand
Weather overview and FAQs
Weather overview
In South Island in September, the average air temperature ranges from 14 °C (57 °F) during the day to 4 °C (40 °F) at night. There are 11 days of rain on average, where the rainfall is 71 mm (2.78 in).
Are there good conditions to visit in September in South Island?
South Island can be visited in September - the weather will be moderate. A relatively low temperature of 14 °C (57 °F) may be ideal for walking or outdoor activities, but some people may have a different idea of the holiday. The night temperature of 4 °C (40 °F) is not inviting for evening and night activities except for visiting a bar and having beer or two.
What temperature can I expect during the day in September in South Island?
In South Island in September, the average daily temperatures will be 14 °C (57 °F). Don't forget a sweater and light or normal jacket, but also pack light clothing in case the temperatures are above average. The weather at this time can be somewhat changeable and a wide range of clothing can become handy.
How many days of precipitation on average can I expect in South Island in September?
There are 11 days, which are rainy in South Island in September, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 2.6 days of the week, or in general - 37 % days.
How many sunny hours can I expect in September in South Island?
In September in South Island, you can expect around 5 hours of sunshine.
How heavy is the precipitation in South Island in September?
In South Island in September, there is 71 mm (2.78 in) rainfall, which means on average 2 mm (0.09 in) rainfall per day.
What is the air temperature in South Island in September at night?
The average night temperature in South Island in September is 4 °C (40 °F). The nights will be cool, layers of clothes will be needed for evening and morning walks, the hotel should be equipped with heating.
How windy is it in South Island in September?
In South Island in September, there will be an average wind scale of 4.
Is September part of the wet season in South Island?
No, there is no wet season in September in South Island - you can expect 11 days of rain during the month.
Is the weather in South Island warmer in September than in August?
Yes, September in South Island is warmer than August by 2 °C (36 °F).
How long is the day (from dawn till dusk) in South Island in September?
The length of daylight in South Island in September is 12 hours.
Is the temperature rising or falling in the course of time in South Island in September?
Over the course of September in South Island, the temperatures are rising from 13 °C (55 °F) at the beginning of the month to 15 °C (59 °F) at the end of the month.