Bruny Island — Water Temperature in December

Water Temperature Range

12°C

minimum

15°C

average

18°C

maximum

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Water Temperature Chart for Month

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

Day	2025	2024	2023	2022
DEC 1	15°C	15°C	14°C	15°C
DEC 2	15°C	15°C	14°C	16°C
DEC 3	15°C	15°C	14°C	16°C
DEC 4	14°C	14°C	14°C	14°C
DEC 5	15°C	15°C	14°C	15°C
DEC 6	15°C	15°C	14°C	16°C
DEC 7	16°C	16°C	15°C	16°C
DEC 8	16°C	16°C	15°C	16°C
DEC 9	15°C	15°C	14°C	15°C
DEC 10	15°C	15°C	15°C	14°C
DEC 11	16°C	16°C	15°C	16°C
DEC 12	15°C	15°C	14°C	16°C
DEC 13	15°C	15°C	14°C	16°C
DEC 14	15°C	15°C	15°C	15°C
DEC 15	15°C	15°C	14°C	16°C
DEC 16	16°C	16°C	15°C	16°C
DEC 17	16°C	16°C	15°C	16°C
DEC 18	16°C	16°C	16°C	16°C
DEC 19	16°C	16°C	16°C	16°C
DEC 20	16°C	16°C	16°C	16°C
DEC 21	16°C	16°C	16°C	16°C
DEC 22	17°C	17°C	16°C	17°C
DEC 23	17°C	17°C	16°C	17°C
DEC 24	17°C	17°C	16°C	17°C
DEC 25	16°C	16°C	15°C	17°C
DEC 26	16°C	16°C	15°C	17°C
DEC 27	16°C	16°C	15°C	17°C
DEC 28	16°C	16°C	15°C	17°C
DEC 29	16°C	16°C	15°C	17°C
DEC 30	16°C	16°C	15°C	17°C
DEC 31	17°C	17°C	15°C	18°C

December: Climate and Swimming Opportunities

Average Night Air Temperature

10°C

Average Day Air Temperature

21°C

Precipitation Amount per Month

60 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

7 hrs

Average Wind Speed

22 km/h

Average Humidity

57%

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.