The best times to visit Stewart Island for ideal weather are
December 24th to April 1st
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Stewart Island Travel Guide
Other Stewart Island Travel Info
Weather in Stewart Island
Average temperatures in Stewart Island vary little. Considering humidity, temperatures feel cold for most of the year with a chance of rain or snow throughout most of the year. The area is far less temperate than some — in the 9th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Stewart Island, the hottest months are January, February, and then March. See average monthly temperatures below. The warmest time of year is generally late January where highs are regularly around 61°F (16.1°C) with temperatures rarely dropping below 52.1°F (11.2°C) at night.
Stewart Island Temperatures (Fahrenheit)
Stewart Island Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Stewart Island Perceived Temperature (F)
Stewart Island Perceived Temperature (C)
Average Stewart Island Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Stewart Island are February, December, and then April. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late January. For example, on the week of January 22nd there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in mid October with an average of 4 days of significant precipitation the week of October 15th.
When can you find snow in Stewart Island? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Stewart Island.
Snow on the Ground
The graph below shows the average snow on the ground in Stewart Island (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Stewart Island has some very humid months, and high humidity throughout the year. The least humid month is December (73.2% relative humidity), and the most humid month is May (78.8%).
Wind in Stewart Island is usually very strong. The windiest month is October, followed by November and May. October’s average wind speed of around 24.6 knots (28.3 MPH or 45.5 KPH) is considered “a strong breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid to late November where average top sustained speeds reach 37.7 knots, which is considered gale force winds.
Relative Humidity (%)
The graph below shows the average % humidity by month in Stewart Island.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||21.4||Strong breeze||31.4||Moderate gale winds|
|Feb||17.6||Strong breeze||25.9||Very strong breeze|
|Mar||20||Strong breeze||28.9||Moderate gale winds|
|Apr||19.2||Strong breeze||27.9||Very strong breeze|
|May||22.2||Very strong breeze||30.5||Moderate gale winds|
|Jun||20.8||Strong breeze||28.5||Moderate gale winds|
|Jul||20.8||Strong breeze||28.1||Moderate gale winds|
|Aug||18.9||Strong breeze||26.8||Very strong breeze|
|Sep||21.4||Strong breeze||30.5||Moderate gale winds|
|Oct||24.6||Very strong breeze||33.6||Moderate gale winds|
|Nov||23||Very strong breeze||33.1||Moderate gale winds|
|Dec||19.4||Strong breeze||28.5||Moderate gale winds|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Stewart Island?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for New Zealand; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 30, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Stewart Island, New Zealand is March, followed by July and June. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Stewart Island in November. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Stewart Island Travel Experience by Season
Fall (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 58.2°F (14.6°C) and 50.4°F (10.2°C) with colder temperatures in the later months. Rain is very common with 8 to 12 days of significant precipitation per month. Fall is the second busiest for tourism, which makes it a good time for those looking for things to do.
Winter (June through August)
The middle-year months have cold weather with high temperatures that are still jacket weather. These months see moderate precipitation with 10 to 11 days of precipitation per month. June – August is the busiest season for tourism in Stewart Island, so lodging and other accommodations may cost more than usual.
Spring (September through November)
Spring daily highs range from 55.9°F (13.3°C) and 50°F (10°C), which will feel chilly given the humidity and wind. It rains or snows a good amount: 11 to 13 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.
Summer (December through February)
Weather is too cold this time of year in Stewart Island to be enjoyable for warm weather travelers. The average high during this season is between 61°F (16.1°C) and 57.6°F (14.2°C). On average, it rains or snows a fair amount: 6 to 10 times per month. These times of year are the slowest with tourists.