January weather - Summer 2025 - Wellington, New Zealand

Weather in January
Frequently asked questions
Average temperature in January
Average pressure in January
Average wind speed in January
Average humidity in January
Average rainfall in January
Average rainfall days in January
Average sea temperature in January
Average daylight in January
Average sunshine in January
Average sunshine days in January
Average UV index in January
Average cloud cover in January
Average visibility in January

A red cable bus on the road in Wellington, New Zealand, with the view of the sea, mountains, and the city in the distance

Weather in January

A summer month in Wellington, January paints a picture of warm days and relatively comfortable nights. Considering the weather in the prior month of December, January offers marginally higher temperatures, while staying a touch warmer compared to the upcoming month of February. Humidity in the city remains constant, providing an almost tropical feel to the air. Note that January experiences wind speeds of 25.7km/h (16mph), making it slightly breezier than its neighbor months. As the month progresses, Wellingtonians enjoy inviting weather, abundant sunshine, and a vibrant summer vibe.

Temperature

Wellington, New Zealand, measures an average high-temperature of a still enjoyable 18.5°C (65.3°F) in January, nearly consistent with the preceding month. The nighttime temperature in January experiences a minor dip, averaging a still refreshing 15°C (59°F).

Humidity

In Wellington, the average relative humidity in January is 79%.

Rainfall

The months with the least rainfall are January and February Rain falls for 9.6 days and accumulates 20mm (0.79") of rain.

Sea temperature

In Wellington, the average seawater temperature in January is 16.6°C (61.9°F).
Note: Most people do not take pleasure in swimming in water at 16.6°C (61.9°F). The difficulty of managing breathing increases as the water temperature dips from 21°C (69.8°F) to 15°C (59°F).

Daylight

In January, the average length of the day in Wellington is 14h and 46min.
On the first day of January in Wellington, sunrise is at 5:50 am and sunset at 8:57 pm. On the last day of the month, sunrise is at 6:24 am and sunset at 8:43 pm NZDT.

Sunshine

The average sunshine in January is 8.8h.

UV index

January through March and December, with an average maximum UV index of 5, are months with the highest UV index in Wellington. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A daily maximum UV index of 5 in January translates into the following instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.

Updated: Jan 27, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are January temperatures in Wellington?

The high-temperature in Wellington, New Zealand, during January is 18.5°C (65.3°F) and the low-temperature is 15°C (59°F).

What is the average humidity in January in Wellington?

In Wellington, New Zealand, the average relative humidity in January is 79%.

What is the driest month in Wellington?

The months with the least rainfall are January and February Rain falls for 9.6 days and accumulates 20mm (0.79") of rain.

How many days does it rain in January in Wellington?

In Wellington, New Zealand, in January, it is raining for 9.6 days, with typically 20mm (0.79") of accumulated precipitation.

What is the sea water temperature in January in Wellington?

In Wellington, in January, the average water temperature is 16.6°C (61.9°F). For swimming, a surface water temperature of 16.6°C (61.9°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Wellington have in January?

The average day length in January in Wellington, New Zealand, is 14h and 46min.

When is the sunrise / sunset in January in Wellington?

In January, on the first day of the month, sunrise is at 5:50 am and sunset at 8:57 pm. On the last day of the month, in Wellington, sunrise is at 6:24 am and sunset at 8:43 pm NZDT.

How many hours of sunshine does Wellington have in January?

In Wellington, the average sunshine duration in January is 8.8h.

What is the month with the highest UV index in Wellington?

The months with the highest UV index are January through March and December, with an average maximum UV index of 5.

What is the UV index reading in January in Wellington?

In January, the average daily maximum UV index in Wellington, New Zealand, is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

17.2°C 63°F

18.5°C 65.3°F

18.8°C 65.8°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

26km/h 16.2mph

27.2km/h 16.9mph

24.6km/h 15.3mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

11.8

9.6

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

16.4

17.8

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Wellington, New Zealand

Average high temperature in January: 18.5°C

The warmest month (with the highest average high temperature) is February (18.8°C).
The month with the lowest average high temperature is July (11.4°C).

Average low temperature in January: 15°C

The month with the highest average low temperature is February (15.4°C).
The coldest month (with the lowest average low temperature) is July (9°C).

Average pressure in January
Wellington, New Zealand

Average pressure in January: 1012.4mbar

The month with the highest atmospheric pressure is March (1017.7mbar).
The months with the lowest atmospheric pressure are September and November (1012.2mbar).

Average wind speed in January
Wellington, New Zealand

Average wind speed in January: 25.7km/h

The windiest month (with the highest average wind speed) is September (26.9km/h).
The calmest month (with the lowest average wind speed) is March (23.1km/h).

Average humidity in January
Wellington, New Zealand

Average humidity in January: 79%

The months with the highest relative humidity are February, March, April and December (80%).
The month with the lowest relative humidity is July (78%).

Average rainfall in January
Wellington, New Zealand

Average rainfall in January: 20mm

The wettest month (with the highest rainfall) is June (47mm).
The driest months (with the least rainfall) are January and February (20mm).

Average rainfall days in January
Wellington, New Zealand

Average rainfall days in January: 9.6 days

The month with the highest number of rainy days is June (14.5 days).
The month with the least rainy days is February (8 days).

Average sea temperature in January
Wellington, New Zealand

Average sea temperature in January: 16.6°C

The best month for swimming (with the highest average sea temperature) is February (17.1°C).
The coldest month (with the lowest average sea temperature) is August (12.3°C).

Average daylight in January /
Average sunshine in January
Wellington, New Zealand

Average daylight in January: 14h and 5min

The month with the longest days is December (Average daylight: 15h and 6min).
The month with the shortest days is June (Average daylight: 9h and 12min).

Average sunshine in January: 8h and 5min

The month with the most sunshine is December (Average sunshine: 9h and 24min).
The month with the least sunshine is June (Average sunshine: 5h and 24min).

Average sunshine days in January
Wellington, New Zealand

Average sunshine days in January: 18 days

The month with the most sunshine days is March (19 days).
The month with the least sunshine days is June (11.5 days).

Average UV index in January
Wellington, New Zealand

Average UV index in January: 5

The months with the highest UV index are January, February, March and December (UV index 5).
The months with the lowest UV index are May and June (UV index 3).

Average cloud cover in January
Wellington, New Zealand

Average cloud cover in January: 31

The month with the most cloud cover is June (Cloud cover 44).
The month with the least cloud cover is February (Cloud cover 30).

Average visibility in January
Wellington, New Zealand

Average visibility in January: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

January weather forecast
Wellington, New Zealand

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