Great Barrier Island — Water Temperature in January

Water Temperature Range

18°C

minimum

21°C

average

24°C

maximum

Water Temperature Chart for January

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
JAN 1	20°C	19°C	21°C	20°C
JAN 2	19°C	19°C	19°C	21°C
JAN 3	19°C	20°C	19°C	21°C
JAN 4	19°C	19°C	19°C	20°C
JAN 5	19°C	19°C	20°C	20°C
JAN 6	20°C	20°C	20°C	21°C
JAN 7	20°C	20°C	20°C	20°C
JAN 8	20°C	19°C	21°C	20°C
JAN 9	20°C	19°C	20°C	20°C
JAN 10	21°C	19°C	20°C	20°C
JAN 11	20°C	19°C	20°C	21°C
JAN 12	21°C	20°C	21°C	21°C
JAN 13	21°C	20°C	20°C	22°C
JAN 14	21°C	20°C	21°C	21°C
JAN 15	20°C	20°C	20°C	21°C
JAN 16	21°C	20°C	21°C	21°C
JAN 17	21°C	19°C	21°C	21°C
JAN 18	21°C	19°C	21°C	21°C
JAN 19	22°C	20°C	20°C	21°C
JAN 20	21°C	20°C	21°C	21°C
JAN 21	21°C	19°C	21°C	21°C
JAN 22	20°C	20°C	20°C	21°C
JAN 23	20°C	19°C	21°C	21°C
JAN 24	20°C	20°C	21°C	22°C
JAN 25	21°C	20°C	20°C	22°C
JAN 26	21°C	20°C	20°C	23°C
JAN 27	21°C	20°C	20°C	23°C
JAN 28	20°C	21°C	20°C	23°C
JAN 29	21°C	21°C	20°C	23°C
JAN 30	20°C	20°C	21°C	23°C
JAN 31	19°C	20°C	21°C	22°C

Climate and Swimming Opportunities in Great Barrier Island in January

Average Day Air Temperature

23°C

Average Night Air Temperature

14°C

Precipitation Amount per Month

88 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

7 hrs

Average Wind Speed

19 km/h

Average Humidity

78%

With such a ratio between the average monthly temperatures of water and air, swimming feels warm and comfortable even if the day isn’t hot. The water can feel warmer than the air, so getting out may feel a bit cool.