Stewart Island — Water Temperature in April

Water Temperature Range

12°C

minimum

14°C

average

18°C

maximum

Water Temperature Chart for April

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

	2026	2025	2024	2023
APR 1	15°C	15°C	15°C	14°C
APR 2	15°C	16°C	15°C	14°C
APR 3	15°C	15°C	15°C	15°C
APR 4	15°C	15°C	15°C	14°C
APR 5	14°C	16°C	15°C	14°C
APR 6	14°C	16°C	15°C	14°C
APR 7	14°C	15°C	15°C	14°C
APR 8	14°C	15°C	15°C	14°C
APR 9	14°C	15°C	15°C	14°C
APR 10	14°C	15°C	15°C	14°C
APR 11	14°C	14°C	15°C	14°C
APR 12	15°C	14°C	15°C	14°C
APR 13	14°C	15°C	15°C	14°C
APR 14	14°C	15°C	15°C	14°C
APR 15	15°C	15°C	15°C	14°C
APR 16	15°C	15°C	15°C	14°C
APR 17	15°C	14°C	15°C	14°C
APR 18	14°C	15°C	15°C	13°C
APR 19	14°C	13°C	14°C	13°C
APR 20	14°C	14°C	15°C	13°C
APR 21	14°C	13°C	15°C	13°C
APR 22	14°C	14°C	14°C	13°C
APR 23	14°C	14°C	15°C	13°C
APR 24	14°C	14°C	15°C	13°C
APR 25	14°C	14°C	15°C	13°C
APR 26	14°C	13°C	15°C	13°C
APR 27	14°C	14°C	15°C	13°C
APR 28	14°C	14°C	14°C	13°C
APR 29	14°C	14°C	14°C	13°C
APR 30	14°C	14°C	14°C	13°C

Climate and Swimming Opportunities in Stewart Island in April

Average Day Air Temperature

17°C

Average Night Air Temperature

5°C

Precipitation Amount per Month

75 mm

Number of Rainy Days

Daylight per Day

11 hrs

Sunshine per Day

4 hrs

Average Wind Speed

12 km/h

Average Humidity

76%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.