Stewart Island Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Stewart Island, New Zealand in September.

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Half-moon Bay

Considering a trip to Stewart Island, New Zealand this September and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What to Expect in Stewart Island in September

Stewart Island, New Zealand is a region in New Zealand. September in Stewart Island generally has mild temperatures, with high precipitation.

Temperatures

You can expect mild maximum daytime temperatures of around 12°C (54°F) and nighttime temperatures around 7°C (45°F) in Half-moon Bay.

To explore the conditions in Stewart Island, New Zealand in more detail, check the map below.

Precipitation

September is a rainy month with an average rainfall of around 116 mm (4.6 in) in Half-moon Bay.

Average sunshine

Sunshine amounts are decent in most places. Half-moon Bay gets approximately 142 hours of sunlight in September, offering a reasonable amount of both bright and cloudy periods. Curious about sunnier destinations? Our weather planner makes it easy to find places worldwide with pleasant weather.

Explore Stewart Island by month

Pick a month to see the average temperature, rainfall and sunshine in Stewart Island — and find the best time to visit. (based on Half-moon Bay)

January17°C (63°F) February17°C (63°F) March16°C (61°F) April15°C (59°F) May13°C (55°F) June11°C (52°F) This monthJuly10°C (50°F) August11°C (52°F) September12°C (54°F) October13°C (55°F) November15°C (59°F) December16°C (61°F)
Best Time to Visit Stewart Island →

Best Places to Visit in Stewart Island in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Stewart Island.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Stewart Island

What is the weather like in September for the most popular destinonation in Stewart Island, New Zealand?

Half-moon Bay

In September Half-moon Bay generally has moderate temperatures with maximum daytime temperatures around 12°C (54°F), minimum nighttime temperatures around 7°C (45°F) and high monthly rainfall. So on average the conditions are poor that month.

« August
September
October »
August
September
October
Max temperature
11°C (52°F)
12°C (54°F)
13°C (55°F)
Min temperature
6°C (43°F)
7°C (45°F)
7°C (45°F)
Monthly sun hours
125 hours
142 hours
176 hours
Monthly rainfall
97 mm (3.8 in)
116 mm (4.6 in)
134 mm (5.3 in)
Monthly rainy days
24 days
23 days
24 days
Weather conditions
unpleasant
poor
poor
Climate in Half-moon Bay →

Is your destination not in the list? Have a look at all destinations in Stewart Island, in New Zealand.

Stewart Island weather in September: frequently asked questions

What is the weather like in Stewart Island, New Zealand in September?

In September, Stewart Island, New Zealand generally has poor weather conditions. Half-moon Bay sees daytime temperatures near 12°C (54°F), with nights cooling to roughly 7°C (45°F).

What is the average temperature in Stewart Island, New Zealand in September?

Average temperatures in Stewart Island, New Zealand during September range from a nighttime low near 7°C (45°F) to a daytime high around 12°C (54°F) in Half-moon Bay.

Does Stewart Island, New Zealand get a lot of rain in September?

Stewart Island, New Zealand sees substantial rainfall in September. Half-moon Bay typically averages about 116 mm (4.6 in), a mix of wet and dry days, but bring an umbrella.

Is September a Good Time to Visit Stewart Island, New Zealand?

In our view, September might not be the best time to travel to Stewart Island, New Zealand with often poor weather in Half-moon Bay.

Generally speaking, January, February, March, April, August, November and December provide unpleasant weather in Half-moon Bay.

Interested in more climate information?

We have much more information about the climate in Stewart Island.

Weather and climate has detailed information for every country in the world. Are you going to New Zealand? Get detailed historical weather averages for many cities in New Zealand.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.

The Tongariro Crossing in New Zealand

It is called the most beautiful walk in New Zealand, the Tongariro Crossing. The official hiking season starts late October until end of April.

White-water sledge and raft in Rotorua

We recommend to white-water sledge and raft in Rotorua in summer (January, February) when the Glacier melt fills the rivers. This is the best time.
Must visit in New Zealand →