Port Willunga — Water Temperature in December

Water Temperature Range

16°C

minimum

19°C

average

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

December: Climate and Swimming Opportunities

Average Night Air Temperature

14°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

28 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

9 hrs

Average Wind Speed

21 km/h

Average Humidity

47%

At such water and air temperatures, swimming feels cool and invigorating. It’s comfortable for a quick dip, and you’ll feel fine as long as you warm up soon after.