South Island - New Zealand weather in December 2025
South Island - New Zealand weather in December 2025
Day
20 °C
Night
10 °C
Sea
15 °C
Precipitation
81 mm
in month
Rainy days
11 days
in month
Daylight
15 hours
average
Sunshine
7 hours
average
Humidity
71 %
Day
20 °C
Night
10 °C
Sea
15 °C
Precipitation
81 mm
in month
Rainy days
11 days
in month
Daylight
15 hours
average
Sunshine
7 hours
average
Humidity
71 %
Overview: South Island - New Zealand
Weather charts for South Island - New Zealand
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Activities in South Island - New Zealand
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Mountain hiking
in 3 places
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Road cycling
in 4 places
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Mountain biking
in 3 places
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Weather overview and FAQs
Weather overview
In South Island in December, the average air temperature ranges from 20 °C (68 °F) during the day to 10 °C (50 °F) at night. There are 11 days of rain on average, where the rainfall is 81 mm (3.18 in).
Are there good conditions to visit in December in South Island?
There are good conditions for visiting in South Island in December. There are some people, who may feel a slight chill at 20 °C (68 °F), but others will feel perfectly fine. The temperature of 10 °C (50 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.
What temperature can I expect during the day in December in South Island?
In South Island in December, the average daily temperatures will be 20 °C (68 °F). A comfortable temperature for most people, where it is neither too cold nor too hot, and a large number of activities can be carried out comfortably, including sunbathing by the water. Lighter clothing will be suitable - shorts, skirts, t-shirts, jackets; a light sweater and long trousers may also be useful.
How many rainy days can I expect in South Island in December?
In December in South Island, we can expect 11 days to be rainy, that is, days when precipitation exceeds 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.
What is the rainfall intensity in South Island in December?
There is precipitation of 81 mm (3.18 in) in December in South Island, which means 3 mm (0.11 in) rainfall per day on average.
What is the humidity in December in South Island?
In South Island in December, expect humidity around 71 %.
What is the night temperature in December in South Island?
The average night temperature in South Island in December is 10 °C (50 °F). Nights can be cooler, morning running can be refreshing but choose appropriate clothing, evening outdoor sitting can be pleasant but you can also be cold.
Is the weather in South Island warmer in December than in November?
Yes, December in South Island is warmer than November by 2 °C (36 °F).
How long is the day (from dawn till dusk) in South Island in December?
The length of daylight in South Island in December is 15 hours.
How many hours of sun to expect in South Island in December?
In South Island in December, you can expect around 7 hours of sunshine.
Is there a dry season in South Island in December?
No, December is not a dry month in South Island, expect rain approximately 11 days in a month.
How windy is it in South Island in December?
An average wind scale that can be expected in South Island in December is 5.
Is South Island rainier in December than in November?
No, December in South Island is not a rainier month than November.
Is the temperature rising or falling in the course of time in December in South Island?
During December in South Island, the day temperatures are decreasing - from 19 °C (67 °F) at the beginning of the month to 21 °C (70 °F) at the end of the month.
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