Stewart Island Weather by Month — Temperature & Rainfall Guide

Stewart Island is a region in New Zealand. Many people wonder what the weather conditions are in Stewart Island over the year. What is the best time to visit Stewart Island?

This page shows the average weather conditions by month in Stewart Island over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

In January the weather in Stewart Island is generally unpleasant. In Half-moon Bay you can expect mild maximum average daytime temperatures around 17°C (63°F) and nighttime temperatures around 11°C (52°F).

Find more detailed climate information for Stewart Island in January here.

In February the weather in Stewart Island is generally unpleasant. In Half-moon Bay you can expect mild maximum average daytime temperatures around 17°C (63°F) and nighttime temperatures around 11°C (52°F). On average, this month is the warmest month of the year in Stewart Island.

Find more detailed climate information for Stewart Island in February here.

In March the weather in Stewart Island is generally unpleasant. In Half-moon Bay you can expect mild maximum average daytime temperatures around 16°C (61°F) and nighttime temperatures around 10°C (50°F).

Find more detailed climate information for Stewart Island in March here.

In April the weather in Stewart Island is generally unpleasant. In Half-moon Bay you can expect mild maximum average daytime temperatures around 15°C (59°F) and nighttime temperatures around 9°C (48°F).

Find more detailed climate information for Stewart Island in April here.

In May the weather in Stewart Island is generally poor. In Half-moon Bay you can expect mild maximum average daytime temperatures around 13°C (55°F) and nighttime temperatures around 8°C (46°F).

Find more detailed climate information for Stewart Island in May here.

In June the weather in Stewart Island is generally poor. In Half-moon Bay you can expect cold maximum average daytime temperatures around 11°C (52°F) and nighttime temperatures around 6°C (43°F).

Find more detailed climate information for Stewart Island in June here.

In July the weather in Stewart Island is generally poor. In Half-moon Bay you can expect cold maximum average daytime temperatures around 10°C (50°F) and nighttime temperatures around 5°C (41°F). On average, this month is the coldest month of the year in Stewart Island.

Find more detailed climate information for Stewart Island in July here.

In August the weather in Stewart Island is generally unpleasant. In Half-moon Bay you can expect cold maximum average daytime temperatures around 11°C (52°F) and nighttime temperatures around 6°C (43°F).

Find more detailed climate information for Stewart Island in August here.

In September the weather in Stewart Island is generally poor. In Half-moon Bay you can expect mild maximum average daytime temperatures around 12°C (54°F) and nighttime temperatures around 7°C (45°F).

Find more detailed climate information for Stewart Island in September here.

In October the weather in Stewart Island is generally poor. In Half-moon Bay you can expect mild maximum average daytime temperatures around 13°C (55°F) and nighttime temperatures around 7°C (45°F).

Find more detailed climate information for Stewart Island in October here.

In November the weather in Stewart Island is generally unpleasant. In Half-moon Bay you can expect mild maximum average daytime temperatures around 15°C (59°F) and nighttime temperatures around 8°C (46°F).

Find more detailed climate information for Stewart Island in November here.

In December the weather in Stewart Island is generally unpleasant. In Half-moon Bay you can expect mild maximum average daytime temperatures around 16°C (61°F) and nighttime temperatures around 10°C (50°F).

Find more detailed climate information for Stewart Island in December here.